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Many thanks to SWLing Post contributor, Dan Robinson, for the following guest post:
UPDATE: Malahit DSP-2 (July 24, 2021)
RECOMMENDATION: Hold Off Until Issues Are Resolved
I thought it important enough to write this update to my earlier extensive review of the Malahit DSP-2, the second version of the Russia-made receiver. Earlier incremental updates can be seen on the main article.
In concluding my main review, I spoke about being on the Malahit “train” and “roller coaster” – and my experiences since have shown that to be true.
As noted in one the updates, further testing confirmed the observations of Malahit users that when voltage of a 18650B battery drops below 3.7 v the receiver did indeed shut down. And the battery icon was still showing 50%.
Georgiy at the Malahit team confirmed this as a software bug, and in a test firmware update, the voltage issue was, according to him, corrected. The result, in a test firmware upgrade (2.10) could be seen with remaining voltage displayed in the battery icon itself. But I was unable to confirm that this actually resolved the issue of inaccurate voltage displayed before yet another problem emerged.
After performing the update from 2.0 to 2.10 Test firmware (more on that a bit later)
I thought things were fine until I noticed that all signals had vanished from the Malahit. This applied to the strongest signals from U.S. religious broadcasters, and down through FM.
In a combination of Telegram and Skype chats, Georgiy was extremely helpful – we went over seemingly every possible cause for this problem and focused on the SMA cable which from observing conversations online appears to be an issue in some units.
We went to the point of disconnecting the SMA from the PCB to test if anything brought back any level of signal, which it did not. With my basic knowledge of electronics, I believe that some problem may have developed on the PCB – whether that is directly related to the firmware upgrade process remains unknown.
On the firmware, the Malahit-recommended PC app is SMT32CubeProgrammer, which is easily downloadable, and instructions for the firmware update are on the Malahit You Tube channel. The process and app look difficult at first.
But things get interesting, as they always do, in using these Bootloader apps as I have found on several occasions in trying to upgrade my AFEDRI LAN-IQ.
Instructions on the Malahit You Tube channel direct you to power off the radio, then plug in a micro-USB cable to the receiver and to your PC. The rough Russian translation says push in and hold both main and smaller encoder knobs, and then press power either once or 3 times, and then watch for the LED to go off. The LED actually doesn’t really go off– in the process of the firmware update, flashes on and off.
I managed to get through the process of upgrading – it was quite smooth. The test 2.10 firmware according to Georgiy is supposed to correct the issue with voltage readings, though again I was unable to test this fully because my DSP-2 quite literally went quiet over its entire range.
As of now, and despite the best efforts of Georgiy which I appreciate, I have a dead DSP-2. Whether signal loss was due to some issue with the SMA connector, or whether the firmware process (I reverted back to 2.0 after noticing the signal loss) itself caused something on the PCB to fail, remains unknown.
Given all of this new information, and though I had made no BUY recommendation on my original review, I would have to advise anyone considering a DSP-2 to hold off for a while until the Malahit team is able to thoroughly iron out all the hiccups with the receiver, whether in firmware or hardware. This includes the question of the SMA connector, and the issue of voltage monitoring.
Based on the conversations that were taking place on Telegram, I would also be urging Malahit team to quickly come up with a clear English translation of the Malahit manual, and to review instructions contained in You Tube videos showing the firmware upgrade process.
Many thanks to SWLing Post contributor, Dan Robinson, for the following guest post:
Test Driving The Russia-Made Malahit DSP-2
Poised on Edge of Greatness? (Some Challenges To Overcome)
by Dan Robinson
By now, the Malahit SDR is well known in listening hobby circles. We have the made-in-Russia original, and those manufactured in China with various firmware and some physical differences such as location of the tuning encoders.
At the same time, we saw the development and appearance of the Belarusian Belka SDR. I consider the latest Belka DX to be the ideal portable – a sensitive diminutive miracle that has become a must-have device for many of us.
As for the Afedri LAN-IQ, I held off on purchasing one until the “Standalone” version was available. It is made in Israel by a Russian developer who supports the receiver with fairly frequent firmware revisions (though upgrading remains a bit of a challenge involving some obscure boot-loading software).
I waited and observed reviews of the original versions of the Malahit. When its designer, Georgiy (RX9CIM), announced availability of the new DSP-2 version of the receiver, with expanded coverage to 2 GHz and a claim of improved performance, I finally purchased one.
As was observed in one of the early SWLing Post articles “It seem[ed] the project is open source, the schematic, PCB and software are available to download. . . we hope [these] receivers become popular and available world wide [and that] this new project “shakes” a bit the industry of shortwave receivers.”
Malahit project authors RX9CIM George, R6DAN Vladimir, and R6DCY Vadim, had the apparent objective of “designing a low-cost portable SDR radio, using only easily obtainable components and to become the natural successor of the popular Degen and Tecsun radios.”
At the time, the price for a finished Malahit, with an ARM chip at its center was about $195 US. Coverage was to 1 GHz – this has since been extended to 2 GHz. Synchronous AM mode was added, and the DSP-2 also comes with an internal battery tray for a single 18650 Li-on battery.
This is a change from the original flat Li-on cell, and in my opinion a welcome one since 18650s are easily obtainable. Being able to easily change out a battery is important, rather than messing around with soldering (the famous Reuter Pocket receiver made in Germany should take a hint).
In this age of the SDR, we’re all familiar with the SDRplay series and various AirSpy receivers, along with other SDRs such as the RX666/888. Before that, we had the famous Perseus, which still has a strong following, and numerous WinRadio receivers.
See the articles here on the SWLing Post assessing the performance of these, as well as reviews at eHam.net, and numerous SDR dongles all over eBay, coming from China. There is also an SDR group on Groups.io.
Of course, receivers and transceivers with panoramic displays began to appear some years ago – the ICOM IC-R8600 and IC-7300 are examples of how this technology was integrated into the listening and amateur radio markets.
What we had not seen was integration of this kind of technology into portables. Even in its latest iteration, the Belka DX has a small screen without any PAN display. So, the advent of the Malahit has made this kind of advanced display widely available.
The price, by the way, for my DSP-2 as of July 2021 was 19,500 Russian rubles, with an extra 2,000 rubles for express delivery via Russian Post (though due to COVID Georgiy stressed that no guarantees could be made as to timing). That’s $263 – not a small investment and rivaling the cost of a Tecsun ATS-909x and H-501x.
According to the description I received when ordering, the Malahit DSP-2 was improved over the previous version with the following differences:
Frequency range – from 50 kHz to 380 MHz, and 400 MHz to 2 GHz
Improved RF shielding and hardware improvements to reduce interference
Changes in software functions
Dimensions changed to 140x 88x 39mm
18650 battery
The DSP-2 is in a thin black metal cabinet with dimensions 5 x ½ by 3 x ½ by 1 x ½.
A power button and headphone jack are on the right along with a power LED. On the top, we find the SMA antenna input, and a small telescopic whip is included.
The speaker, capable of some decent audio, is located on the inside rear of the receiver – audio level exceeds that of the Belka DX with its very small speaker, but the Belka has a clarity that often exceeds the Malahit.
My first testing of the DSP-2 was indoors, in a far corner on the top floor of my home, using just the included whip antenna. For comparisons, I used a Tecsun PL-368 with its whip antenna and a Belka DX in the same location. I find that indoor testing tends to identify some issues that would not be apparent outdoors.
In this, the Tecsun PL-368 and other Tecsun portables consistently performed best, followed by the Belka DX and the Malahit. This may be surprising, but shows that radios specifically designed for shortwave reception, often provide better reception because they are matched better with their internal telescopic antennas.
Now, when I say “best” I mean best basic audio quality, using auto-memory and ETM functions on the PL-368 and 990x. But what those radios can do with the signal after that point is pretty limited – there is no NR (noise reduction), you’re limited to a handful of set bandwidth selections, and SYNC mode leaves much to be desired.
Which is where the Malahit comes in with its numerous levels of flexibility, accessed through MENU icons on the lower part of the screen: HARD, AUDIO, VISUAL, NR, MODE, and BAND. I refer the reader to the Malahitteam site links showing the user manual (this is still a bit in the rough, with translation from Russian) and another link with a Quick Start guide written by John Pitz (KD8CIV).
KEY HIGH POINTS ON MALAHIT
SUPERIOR COLOR DISPLAY
The color display, also seen on numerous China-made clones, is the best on any handheld SDR. Where the Belka LCD is a basic utilitarian tool that performs well for that receiver, the Malahit display is an invitation to the wonderland of what this receiver offers.
At the top are small icons for: SQ, NB, NR, AGC, ANT, PRE, MODE. Right of center, and controlled with pushes of the small volume encoder knob, are ATT, VOL, FILTER, and the battery icon. Below those are headphone and speaker icons and an excellent, if small, frequency window. Pushing the small encoder knob selects/controls volume, attenuation, and main filters. The large tuning knob, with a press, selects step increments.
EXCELLENT NOISE REDUCTION
Noise reduction on the Malahit is superb, as many users have observed. It’s activated directly with a front panel icon and Threshold is adjustable with an icon under AUDIO, with 0 to 30 increments. NR is so good that I compare it with the latest firmware version on the ICOM IC-R8600 – it’s actually probably better than the ICOM even near and at the highest 30 level.
EXCELLENT FILTERING
Whereas the Belka DX offers fixed audio filtering values accessible via its front panel, the Malahit DSP-2 offers continually variable LOW FREQUENCY adjustment from 0 Hz to 2350 Hz, and HIGH FREQUENCY adjustment from 100 Hz all the way up to 150,000 Hz. This is in addition to standard NARROW, NORMAL, and WIDE filter options selectable with the volume encoder knob. This is nothing short of extraordinary for a handheld portable receiver.
The latest (and possibly last) Tecsun receivers offer set value multiple bandwidths, which is excellent but is a throwback to radio design from years ago. So, the DSP-2 capabilities can be compared to the kind of filtering that a Watkins Johnson or Cubic receiver have, but in the palm of your hand.
As I often observe, what we would have given in gold to have this kind of capability in consumer receivers during the glory days of international broadcasting!
AGC / MGC FLEXIBILITY
The Malahit allows the listener to use AGC, with choices of SLOW, MEDIUM, and FAST. But it also allows, again through the AUDIO settings menu, control of AGC GAIN 0 to 60, and AGC LIMITER 40 to 90 db. Wow – priceless! So even if you prefer, as I do, to listen to shortwave using AGC, you still have amazing flexibility. You can still switch to MGC with 0 to 60 range.
NOISE BLANKER FLEXIBILITY
Just as the Malahit delivers on AGC, so does it deliver with its regular noise blanker function. With NB activated, there are 3 configurations with a separate THRESHOLD icon adjustable for each of these. Amazing.
RF GAIN FLEXIBILITY
RF GAIN is adjustable from 0 to 59, and there is a separate icon for adjusting gain for the PRE-AMPLIFIER. Where the PREAMP comes in very handy is when one has the Malahit indoors – it provides a more sensitivity in situations where one is using the telescopic whip antenna, though care must still be taken not to overload the receiver and distort signals.
FCORRECT FUNCTION MAKES FOR EASY RE-CALIBRATION
The Fcorrect function located under the HARD settings menu enables one to re-calibrate the receiver to correct for error. This is similar to the capability that Tecsun added to its 330, 909x and 501x receivers (there are indications Tecsun has or will enable this ability also in the PL-368) but seems, based on my testing of the Malahit to be more effective. After I corrected my DSP-2 to about +57, calibration was pretty much on the money up and down the HF bands.
SQUELCH FLEXIBLITY
The Malahit not only has SQUELCH, but SQUELCH THRESHOLD control, another example of the tremendous flexibility in this receiver’s firmware. Since I do not do much listening outside of the HF bands, or have the antenna for it, I have not extensively tested the Squelch above 30 MHz and up to the maximum range at 2 GHz.
There is yet another feature described as adaptive noise canceling that allows the user to significantly improve the intelligibility of the received station under conditions noise and interference.
[From the manual]: The squelch uses different algorithms [depending] on filter bandwidth. With a bandwidth of more than 1 kHz, a squelch of more than suitable for speech type signal. With bandwidth less than or equal to 1 kHz, the squelch is suitable for tone type signals. Choice of algorithm is carried out automatically, depending on bandwidth. Meanwhile, squelch for speech signals can be used with NR (see further details on this in the manual).
FM RECEPTION WITH RDS
What the Belka DX lacks, namely reception of the FM range, the Malahit delivers in droves. FM sounds excellent to me, on the same level perhaps of the Afedri LAN-IQ Standalone receiver.
RDS is enabled by touching the waterfall area of the display which brings up the RDS information. The speed with which station information appears varies depends on position of your antenna and signal level.
As one user (Harold Hermanns) on the Facebook Malahit group observed: “ I don’t think it works very well. I just checked mine, and went to about 25 stations. The RDS or station name came up on only 5 stations. Letters I get are PS, PT, and PTY. When you tune a strong station, give it a minute or so, that’s what I did, and the RDS feature does work, but again, it’s not 100%. Maybe will be improved with firmware?”
The RDS information could be better organized – currently the name of the station, and name of the program scrolls on different lines. Another touch of the screen brings up an old style FM scale – this is nice, but I prefer the PAN display. Yet another touch returns the screen to the PAN display and waterfall. Mode options include NFM and WFM, and another option provides FM-STEREO. Also in FM, there is an auto-search function and station labeling
MISCELLANEOUS FEATURES
There are some other features in the mind-boggling list of options in various menus:
In FM (WFM) there is an eight position EQUALIZER function with SOFT, LIVE, CLUB, ROCK, BASS, JAZZ, POP, and VOICE positions.
A voltage monitoring function allows the user to turn off the receiver when voltage drops lower than 3.3 volts. As explained in the manual this is intended to preserve battery life and avoid full discharge.
Antenna selection can be 50 ohms or Hi-Z (preferred for telescopic antenna use).
As the Malahit manual details, internal gain of the receiving chip can be adjusted. Accessed from the HARD menu, this is too much for me to go into here, but it’s another example of the detail that went into designing the Malahit.
Brightness of the display backlight is adjustable as well as time after which backlight level is reduced to minimum and turned off completely. Rate of change of the display spectrum is adjustable as is spectrum display range, color, ratio of waterfall and speed and brightness of waterfall. Spectrum scale and view are adjustable.
There is a 5 page memory system, with M1 to M10 in each, so a total of 50 storable memories.
LOW POINTS OF THE MALAHIT
NOISE FROM THE DISPLAY
Example of noise on 1,000 kHz
As I was testing my Malahit DSP-2 it quickly became clear that there is one major low point, and thus a challenge for Georgiy and other members of the design team.
There’s no other way to say this: internally-generated noise remains the major issue keeping the Malahit from achieving greatness.
The developers of the Russian version receiver have not attempted to hide this, and users noticed it from the beginning, with one writer identifying “internally generated noise, which peaks at various frequencies” as one of the key drawbacks of the Malahit.
I had hopes that the DSP-2 version of the Russian-originated Malahit might have less of this problem. There are numerous internally-generated noise/buzzing spikes, some stronger than others, by my estimation at intervals between 125 and 200 kHz throughout the HF bands.
Example of noise on 6,000 kHz (RHC)
In the case of one huge noise spike appearing at or around 6,000 kHz – right over Radio Havana – it ruins any chance of hearing clear signals at, below and above that point. As you can see in my video, the Belka DX does not have this problem (note: apologies for mis-spelling Malahit as Malachit).
Via Telegram, Georgiy asserted to me that when using an external antenna, noise is not as serious, and notes differences between the Malahit and Belka. The Belka, he says, is a simpler device that concentrates only on shortwave, while Malahit is a wide band receiver with more complex DSP and user functions.
“When Belka cannot receive something, Malahit can. And where Belka does not have noise, Malahit has it. These devices are in different classes.”
The result is that a major workaround is often necessary – to disable the VIEW PAN&WTF option, a key feature that is a major highlight of the radio.
Georgiy says that this problem is mainly linked to telescopic antenna antenna operation because of the antenna’s proximity to the display. But as you can see in my video, when testing the Malahit and Belka on 6,000 kHz it’s a night and day situation.
A quick push of the power button blanks out the display completely – and seems to completely resolve the noise issue. But you don’t buy a radio to see a dark display, and it’s depressing to think that turning off a major feature, namely panoramic display, has to be part of standard operating procedure.
When testing the Malahit from its bottom frequency of 50 kHz, even with the PAN & WTF off, huge buzzing noise spikes are heard. In mediumwave/AM, they are seen at 615 kHz, 790 kHz, 965 kHz, 1140 kHz and so on.
If a radio had emerged from a known large manufacturer with this issue, such as Tecsun or Sangean, it would have been roundly condemned by users and reviewers and sent back to the drawing board.
Georgiy does say that in the new firmware interference from the display was decreased, with a “step of about 2.5 MHz, from 1MHz (i.e. 1MHz, 3.5MHz, 6MHz). After correction it will be with a step [of] 4 MHz”. I’m not quite sure what he’s saying with this, due to language issues, but the overall indication is that he is aware of this issue and will continue trying to tackle it in future revisions.
CW DECODING
In the MODE section of the Malahit there is no confirmation that the receiver is actually in CW. Decoding is enabled with an icon, but again no confirming icon at the top of the display. This is a bit odd.
Going to the Telegram app discussion group for the Malahit, and re-reading the translated Russian manual, I discovered that confirmation of CW appears as a white bar under the SPEAKER/HEADPHONE icon on the right. There is also a MINIMUM SNR option in decoding, with a 0 to 70 range.
A You Tube video (the Gerry DX channel) shows the decoding process and notes that it’s important to keep the filter setting at NARROW when attempting to use the decoding feature on the Malahit and also important to set the SNR at the right level.
One would think that this could be easily rectified, but adding a CW indicator to the top row of small icons on the front display might not be as easy as one thinks, unless the display can be modified to also display “CW” in the icon spaces for AM, LSB, or USB.
It turns out that CW decoding on the Malahit works quite well, at least in my attempts. I was able to decode fairly strong CW signals in 40 meters.
LCD/TOUCH SENSITIVITY
When I first got the Malahit, I was puzzled by what seemed to be a serious lack of sensitivity on the display when trying to use the touch icons to change configurations and modes.
This was so bothersome that I raised it with Georgiy who responded that this is by design. The present capacitive touch method, he says, is preferable and more comfortable for users. “If [we were to] change the touch [enable faster response] then [some] people will demand to decrease it.”
With benefit of some time, I have concluded that a slightly firmer and longer press of about half a second to a second almost always brings up the menu selected. But this is definitely a characteristic of the DSP-2, so potential owners should be aware of it.
ISSUE WITH CLOCK
Another issue that prospective purchasers should be aware of involves instances where the internal clock of the receiver does not retain the time, and the solution for this directly from Georgiy is not necessarily satisfactory.
“Yes, they need to be removed from the PCB” he says, a reference to two capacitors on the main PCB, C29 and C30 which are next to each other below a larger M7 device on the PCB.
These are SMDs so anyone without good soldering skills will be hard pressed to want to mess around with that PCB. This is not a confidence-builder, nor a solution – clearly these receivers should come from the supplier without such an issue.
This was upsetting enough for some users that the Malahit team faced some sharp criticisms. One user said the clock on his DSP-2 was working perfectly. Another said: “Unless I power off the unit the date stays good but the time is always 2 hrs and 10 minutes behind. As soon as I power off the unit the date defaults back to 15:08:2062.”
One user said: “Problem is voltage is very inaccurate causing the clock settings to be lost. I have tried several 18650 batteries (good Panasonics) and fully charged they are 4.2v, but the DSP-2 indicates 4.6v. When the battery runs down to 4.0v the clock settings are lost. Also, the battery indicator continues to show FULL. I think there is an internal problem with the DSP2. Perhaps the new design, or new internal parts are causing this. This is very disconcerting.”
In exchanges on Telegram, Georgiy said he personally checks each outgoing Malahit for sensitivity on each band, and clock operation, among other things. In a later comment just before this article went to press, Georgiy said that C29/C30 should be replaced only if there is a problem with the clock.
There is no mention by the Malahit team of any official return policy – which of course would be quite challenging and costly involving an additional round trip for a receiver back to Russia and then back again to the user.
On my DSP-2, which I have used with an Anker 26800 USB battery, so far my clock/date settings have maintained accuracy with no reset, even after the USB cable is unplugged from the receiver. I have not yet tested longer times to see if the clock/date is reset when voltage drops below a certain point.
[UPDATE: 22 July 2021]
In a message sent after publication, Georgiy says that the C29 and C30 capacitors will be deleted from the next series of the Malahit, and for now they are being removed from receivers that have not been sold yet.
[UPDATE 23 July 2021]
Further testing revealed that the observations of Malahit users are accurate. When voltage of a 18650B battery in my Malahit dropped below 3.7 v the receiver did indeed shut down — this is with the battery icon still showing 50%. So this is definitely an issue that needs to be addressed in future updates. That said, I got hours of operating time before the full 18650 dropped to the cutoff level — but obviously an inaccurate battery icon is something that the Malahit team will have to correct.
THE BATTERY GAME
Example of 18650 rechargeable batteries
The Malahit DSP-2 uses a 18650 Li-on battery. Unfamiliar to many people, these are actually well known among professional-grade flashlight collectors/users (flashlight collecting is another of my vices).
One of the first things I realized when my Malahit arrived was that my existing button top 18650 cells were too long to comfortably fit in the battery tray. A bit of research on the Facebook Malahit group page revealed that some users have modified the receiver to take two 18650 cells, with a double tray replacing the single tray.
The original Malahit tray requires shorter “unprotected” flat top 18650 cells. At the time I write this, there is a shortage of these cells at the major battery / flashlight suppliers (Battery Junction is one). DO NOT try to force a slightly larger 18650 in the stock Malahit battery tray!
So, one recommendation I would make to the Malahit Team in Russia would be to make it possible for the receiver to use regular protected button top 18650s, of the type one would easily use in a Tecsun receiver such as the 909x and H-501x.
However, in a message to me just before this article went to press, Georgiy said that the Malahit team has used “typical holders” available to them and that they had been unable to obtain a sufficient number of alternative trays for protected 18650 button top batteries. So, for now at least the Malahit will require unprotected flat tops.
My 18650B flat top batteries arrived just as I was completing this review – easily charged up in my Littokala charger, each then fit easily in the single battery tray and power the Malahit perfectly.
ENCODER KNOBS
Higher quality replacement knobs
The original encoder knobs on the Malahit can be replaced by higher quality, metal construction ones for the small and larger knobs. I got mine from Nikolay, a member in Russia of the Malahit Facebook group (he says he sources them from Switzerland, but I have not confirmed this).
I am, however, not sure that the new knobs can simply be installed on the Malahit – there are no set screws on the original plastic Malahit knobs and I chose not to mess around to see whether the metal knobs can easily be installed, at least for now. Price for the higher quality metal knobs: $17
[UPDATE 23 July 2021]
Nikolay Vedeneev in Russia produces high quality encoder knobs for the Malahit, Afedri, and Belka SDR receivers. He can be reached at: [email protected] and received a very positive review from Fernando Duarte who is known for his reviews of numerous receivers. Both of his knobs fit perfectly on the shafts of my Malahit DSP-2 and have a much better feel than the originals (NOTE: I used a 1.5 mm hex key to tighten the set screws) https://fenuradio.blogspot.com/2020/07/custom-tuning-knopfe-fur-jedes-gerat.html
The subtitle of this article asks whether the Malahit is poised on the edge of greatness. I believe it is, but anyone’s choice to join the Malahit user/fan club comes with some headaches.
We can only hope that the Malahit team can work on the problem of noise spikes that permeate the lower frequency ranges from mediumwave on up. There’s no way to minimize this: at $263 (the price of a DSP-2 as of July 2021) buyers should not have to be shutting off the display to eliminate noise.
As for the question of the clock on the DSP-2 not maintaining time/date, etc it’s clear that Georgiy and the Malahit team are aware of this issue and one hopes this could be checked off the list of concerns that users have raised.
Whether one needs all the bells and whistles that a Malahit offers is the major question, especially when the Belka DX offers excellent stepped (not continuously adjustable) audio filtering and a form of synchronous AM detection in what has to be the smallest high performance receiver ever available to the listener.
More than a few Malahit owners have observed that between 1.5 MHz and 30 MHz the Belka DX seems to be the better shortwave receiver, with no display noise issues, superb battery life and an amazing small size that makes it the ultimate ultra-portable.
In short, if you choose to step aboard the Malahit train you enter a world where there will be constant improvements in software and hardware, and bugs along the way, of which noise spikes issue is a perfect example. But if you’re someone who gets enjoyment from being on the leading edge of technology in radio development, the Malahit may be for you.
It’s impressive that the Malahit originated in Russia, not generally been known for innovations at this level. In recent years, Asia was the main source of advances from the likes of ICOM, Yaesu, AOR etc in the amateur radio area, and from Tecsun, Sangean, and Eton in the area of portable receivers for HF listeners.
Finally, one has to wonder about the potential that the Malahit design holds for integration into the kind of portables seen over the past two years. Some observers have asked why the LCD display and other features on the Malahit could not be part of a future receiver that looks like a Tecsun 990x or Sangean 909×2 with additional advances such as off-air microSD recording, and DRM.
FINAL ASSESSMENT: I boarded the Malahit bus fairly late, but I am definitely a fan. Owning one of these receivers is indeed a roller coaster – anyone climbing on should become a member of the Facebook and other discussion groups where users exchange views, suggestions, and their own experiences.
For ultimate portability in 2021, the Belka DX wins the race. But the Malahit wins on the sheer number of advanced signal processing and other features it contains, though it is hobbled to an extent by the problem of display interference.
If Georgiy and the Malahit team can continue to make steady progress in confronting the noise issue and fine tune the already amazing array of features, the Russia-made Malahit has a bright future ahead.
[UPDATE 24 July 2021]
In the latest firmware update to the Malahit DSP-2, Georgiy provides this
changelog. Note that this is still described as “TEST” firmware, so it’s still unclear
whether he intends to put out a non-TEST version of this particular upgrade:
Firmware 2.10 TEST:
fixed battery voltage indication
fixed behavior of encoder buttons at low supply voltage
protection against false switching has been made – for switching on by three, set switch 2 to the On position.
added test function – increased display frequency. This reduces noise and increases the number of frames per second; To enable this function, set switch 3 to On. The function may not work correctly, if so, please let me know
the level of interference from the display is slightly reduced
changed the distribution of frequencies to which the input high-pass filters are turned on
when HiZ is turned on, the power supply of the external active antenna is automatically turned off;
added indication of external antenna power on – now the ANT indicator is highlighted in red if this function is enabled
the algorithm for displaying the picture on the display, slightly reduces the level of interference
changed the panorama display mode from “Pan & WTF Disabled / Enabled” to “Pan & WTF Single / Always”, while the panorama image is now always present, but it is updated once (when the settings are changed) or always.
fixed attenuators bugs
[UPDATE 2, 24 July 2021 ]
Please read this updated post explaining why I believe you should hold off on making the DSP-2 purchase until software and hardware issues have been resolved.
Many thanks to SWLing Post contributor, Dan Robinson, for the following guest post and review:
Sangean v Tecsun in the Battle of Late Shortwave Era Portables: The ATS909x2
by Dan Robinson
Some years ago – actually more than a decade – I decided to give Sangean a shot at winning me over in the shortwave portable category.
I had and still do use numerous portables with a bias toward the classic SONY, Panasonic, and Grundig sets. The ones that made an impression stayed, often in multiples, as anyone can see if they visit the radio shack here in Maryland.
These include, for those interested: the Panasonic RF-B65, SONY ICF-SW77, ICF-2010, ICF-PRO80, ICF-7600D, ICF-7700, ICF-SW1000T, ICF-SW55, ICF-SW100s, ICF-SW07, Grundig Satellit 500, to which were added in more recent times the Toshiba RP-F11, XHDATA D-808, and Tecsun portables ranging from the PL-365 and new PL-368 to the PL-880, PL-990x, H-501x, and S-8800.
Sangean has generally not been on that list. There’s a good reason – I just never considered Sangean to be competitive when it comes to portables, though they did have some excellent larger sets such as the ATS-803A that made the first forays into multiple bandwidth options.
My last experience with Sangean was with the ATS-909. I liked the looks and capabilities of that receiver, and even went to the point of having mine modified by Radio Labs. But those mods were underwhelming, in my view, and the original 909 always seemed to me to be deaf when using the whip antenna.
That issue continued unfortunately with the 909x. Some of you may have seen a video I did a few years ago in which I set a 909x against a SONY SW-07 and Panasonic RF-B65. This was done barefoot with only the whip antennas, but near a window. In short, the other two radios wiped the floor with the 909x.
It took a surprisingly long time for Sangean to update the 909x with the 909×2, during which companies asked valid questions about the need for further development of world band portables.
Eton turned the market on its head when it introduced the still superb E1/XM which competed with the very end of SONY portable production, and co-designed with R.L. Drake added such superb features as Passband Tuning and three selectivity positions.
Meanwhile, Tecsun plugged away, introducing an impressive array of portables including the PL-600 series, then the 880 and now the 990x and H-501 portables.
So, now the 909×2 is here and with its 073 firmware upgrade has become a bit of a holy grail for portable receiver users. There have been a number of excellent reviews, including Dave Zantow’s deep dive, and some others here on SWLing Post.
I’m going to give you my impressions, using the really detailed Zantow review as a base. I received my 909×2 from Amazon just today – it is a 073 firmware which confirms that new supplies have the upgrade.
SENSITIVITY ON WHIP
First, let’s get the elephant in the room out of the way. Although I have not undertaken detailed technical testing of the 909×2 – nor do I have the equipment to carry this out – it does seem that Sangean may have finally tackled this crippling flaw that rendered the old 909x nearly useless when using it only on the whip. I’ll undertake further testing and comparisons with some of my other portables to confirm this. The whip antenna itself is robust – solid and long, something that Tecsun could take note of.
AIR BAND
Inclusion of air band on this radio is a major selling point for those interested in this type of monitoring. My initial tests showed the 909×2 to be quite sensitive and useful – I managed to pick up no fewer than five airport comms frequencies in my area here in Maryland.
SELECTIVITY / AUTO-BANDWIDTH
The 909×2 really shines with FIVE available selectivity options that are easily selectable in shortwave mode. It would have been nice to be able to actually see the values of each filter as one scrolls through, but that’s a minor point. Think about it – in shortwave AM mode, this is the number of selectivity positions that one finds on such power house communication receivers as a Drake R8. Amazing that we now have that in a portable. On the negative side, I find the auto-bandwidth feature on the 909×2 to be nearly useless, as useless as the similar feature found on Tecsun receivers. The automatic switching is distracting and annoying. My advice to users: forget this, and stick with manual bandwidth control. My advice to Sangean – I wish they had left this feature out but given us multiple bandwidths in SSB.
LCD AND BRIGHTNESS
Sangean hits it out of the park with this multi-stage lighting for the display. Simply superb and the kind of quality we could only hope for from other manufacturers.
MAIN TUNING / DETENT CONTROL
I found the detents on the old 909x to be annoying – indeed, modifications have been available that could remove this feature. But Sangean being Sangean, the detent wheel remains in the 909×2 and it is not a deal killer.
AUDIO QUALITY
The radio retains the excellent audio of the 909x – I am not sure the 909×2 exceeds what one hears from a Tecsun 990x or H-501x but it’s right up there and competitive.
POWER SUPPLY
As others have noted, thanks to Sangean for sticking with AA cells. Together with internal charging when using Ni-Mh cells this is a major selling point. On the other hand – competitor Tecsun went a step farther with its H-501x which though it uses 18650 lithium batteries, has dual batteries, one of which can be held in standby, and switchable charging. That’s a design feature that you really have to respect.
VARIABLE RF GAIN
Again, as noted by others Sangean retained the extremely useful thumb wheel RF gain control. This is an excellent feature.
KEYPAD
Another home run for Sangean when it comes to the keypads on the 909×2, which can be compared in this respect to the Tecsun H-501x which itself improves upon the 990x when it comes to front panel control. Time will tell, however, and we shall see if the keys on these radios hold up in heavy use.
UP/DOWN SLEWING
These controls which sit outside the circular main tuning knob are excellent, and reminds one of the slewing buttons on the SONY 7600GR, SW1000T and SW100.
S-METER / DISPLAY
RSSI and SN Digital Signal Strength Information are provided on the beautiful 909×2 display. This is an improvement over the Tecsun signal strength/SNR meters that I wish would be redesigned, if in fact Tecsun has any intention of future modifications to their portables.
NO SOFT MUTING
Thank goodness we don’t have to deal with the annoying soft muting issue that is still seen in some other portables (the XHDATA D808 comes to mind along with the Eton Executive). Soft muting quite simply ruins a listening session and it’s baffling that any manufacturer still puts it in.
NEGATIVES (I AM IN TEARS)
OK, close all airtight doors and prepare to dive! Here are the negatives I see with the 909×2. I held off obtaining one of these radios because I knew there would be issues. And I was disappointed enough in the past with the 909x and 909 before it that I had almost decided not to go for it.
SIGNS OF LONGWAVE RECEPTION PLAGUED BY CROSS-MOD FROM MEDIUMWAVE
On my particular unit – it remains to be seen whether this is true for others – long wave seems to be near useless. The band is filled with mediumwave stations bleeding through. Turning down the RF obviously helps but I still hear AM stations here in the DC area, when I am in LW mode.
SSB PERFORMANCE
ALERT FOR SANGEAN AND ALMOST A DEAL BREAKER – as mentioned in the Zantow review, and in other comments I have seen on the 909×2, the drop in level from AM to LSB is a killer negative.
This is less noticeable in MW. But if you are in shortwave and have turned your volume up on any particular station, say a strong one such as Greece on 9,420 kHz or Spain, or an AM station, and you then switch to LSB it is like you have almost lost the signal. This simply needs to be fixed. Level on USB seems fine and acceptable, but LSB on shortwave requires immediate upwards adjustment of volume, only to have to reverse the process when returning to AM mode. I find this problem to be sufficiently serious that I would recommend against obtaining a 909×2 until Sangean finds a way to fix it. This issue is on the same level of BAD as the still unsatisfactory SYNC mode in all three of Tecsun’s shortwave portables. In fact, I may return the 909×2 I obtained and wait until a fix for this emerges.
Example Video
In this video, I demonstrate the extent of the problem as seen on this particular unit of the 909×2, which carries a serial number dk201043181.
Dave Zantow says his unit does not have this issue, so there is a possibility this is due to unit to unit variation. As you can see, with a strong signal such as 12,160 kHz — switching from AM to LSB instantly reduces listenable level, and signal as measured on the 909×2 drops to zero bars or near zero. In USB, the reduction is less severe. Regardless, having to perform adjustments with main volume just to struggle to hear any signal in SSB is a bit ridiculous. This kind of thing is not seen on the Tecsun H-501x or 990x though as Dave correctly points out, Tecsun receivers are not exactly great performers in SSB. On Tecsun receivers, there is a slight processor pause while the receiver makes the switch into LSB or USB, without the sharp reduction in listenable level.
CALIBRATION ISSUES WITH NO WAY TO ADJUST
Imagine my joy when I first began using the x2. Initially, it seemed to be smack on frequency – I tried this on WMAL, the powerhouse local AM station here in the DC area, and then again with stronger stations on shortwave, such as 12,160 kHz. Ah, I said to myself, Sangean has some decent QC and paid attention. About 30 minutes later, however, what I found matches the Zantow review. Stations are consistently low of the tuned/displayed frequency by as much as 300 Hz. The reason this is so disappointing is that I feel Sangean could have taken a clue from Tecsun and provided a re-calibration function (unless it exists and we aren’t being told about it). On Tecsun radios, the re-calibration capability is the major counter-punch to poor synchronous mode – in my view, one can live with flawed SYNC on a 990x or H-501 or PL-330 as long as you can adjust and at least have zero beat or close to it across frequencies. At the same time, as Zantow points out, no one should be expecting TCXO level performance from portables such as these. However, it is a bit disappointing that after all these years and redesign of the 909x to add some really nice features, they’re still landing up to 300 Hz from a tuned frequency. On the other hand, is this really any worse than one would see from an off-tuned SONY ICF-2010? No, and adjusting those older receivers required surgery.
CONCLUSIONS
I really like the 909×2. There simply is something about this design that Sangean knew was a winner when it first arrived on the market years ago, so it’s not surprising that Sangean stuck with it. It’s clear that some hard thinking went into the step up from the old 909x, notably the larger LCD, addition of finer step tuning to make SSB easier, the robust antenna and the still pretty darn good audio through the wonderful speaker. The 909×2 is a radio that you can imagine guests would comment on if it were sitting on your coffee table – it just looks THAT GOOD.
But then here in 2021, so does a Tecsun H-501x LOOK THAT GOOD. As I noted above, where the Tecsuns fall down – with their still challenged synchronous mode – they make up for with the ability to re-calibrate.
That is a huge feature and one that Sangean struck out on, though surely Sangean designers had to know the 909×2 would appeal both to listeners and to hobbyists with obsessions about frequency accuracy.
To repeat, I really (really) like the 909×2. But another area where the receiver strikes out is the problem with sharp reduction in LSB mode. Seriously – you have to crank the volume control up to at least 50 percent to hear ANYTHING when you’re in LSB, whereas USB requires going only up to about 30 percent. Then when you’re completing your carousel back to AM, you have to be sure not to still have the audio up at 50 percent or more to avoid blowing your speaker.
Again, as I said above, the calibration/drift issue on the 909×2 can be lived with. The problem with LSB, in my opinion, cannot or should not be tolerated. So, the question is, do you want to purchase a 909×2 now that still has that LSB audio issue, or wait a while until Sangean gets its act together?
These and other earthshaking questions are before us here in 2021. We have some of the best portables ever made by anyone in a time of sharply declining shortwave use, but they each have their flaws.
I don’t usually do a star rating or RECOMMEND / NOT RECOMMEND for radios. This time, I am going to make an exception and it links directly to the issue of the LSB problem on the 909×2. These radios simply should not have been allowed to enter the market with this being as serious a problem as I think it is. For that reason, I honestly cannot recommend a Sangean 909×2 until this is corrected.
Many thanks to SWLing Post contributor, Giuseppe Fisoni, who reached out a few weeks ago noting that he was very impressed with the Icom IC-705‘s receiver performance even compared with his Icom IC-R8600 wideband receiver.
I asked Giuseppe if he would perhaps write up a short informal report to share here on the SWLing Post. He just sent me the following notes:
Hi Thomas,
[…]Consider this more of a qualitative comparison – just S meter readings with a few brief notes.
My overall impression is that the IC-705 is a fantastic SW receiver, as you’ve already made clear on all your posts. In most cases, it holds up well against the IC-R8600, and even performs better in some cases. I have some notes below, which you are welcome to share with your readers if you’d like. For a while I also had two IC-705s in my hands, so I even got to test “replicas” with the 705 (there was no major difference but it was still fun to do).
A few things about my comparisons:
1. All tests were done using a 50’ long wire antenna (house to tree) with an un-un.
2. The IC-R8600 was operated using an ICOM AC adaptor (creating a disadvantage), while the IC-705 was run on battery. However, I tried to only compare stations where the noise floors were comparable and the 8600 didn’t have any RFI.
3. I tried my best to normalize the RF gains on each radio, but this became somewhat difficult. I’m not sure if they are on the same scale (i.e. does 80% RF gain mean the same thing on both radios?). Also, I very quickly noticed that turning up the RF gain on the 8600 only increased the S meter reading and apparent noise floor on the waterfall spectrum, but it did not actually make the audible signal or noise audibly stronger. This was especially true from 50% and up on the RF gain. In contrast, the RF gain on the 705 operated as you’d expect – the more you turned it up, the higher the gain on the signal (and noise), evenly across 0-100%.
Test #1
2021.02.08
0211 UTC
3,330 kHz CHU
IC-705: weak signal but audible, S6
IC-R8600: no signal!
Winner: clearly 705. Shocked the 8600 couldn’t pick up CHU!
Test #2
2021.02.08
0219 UTC
3,215 kHz WWCR Nashville
IC-705: S9+20
IC-R8600: S9+20 to S9+40.
Winner: Tie – although the 8600 had a stronger signal on the S meter, it didn’t really sound any better than the S9+20 on the 705.
Test #3
2021.02.18
1958 UTC
9,690 kHz Radio Espana Exterior
IC-705: S9 to S9+10
IC-R8600: S9+20
Winner: Another tie – the stronger signal didn’t make much of a difference. The 8600 only sounded slightly better because of its speaker, not the receiver, so I’m calling it a tie.
Test #4
2021.02.18
2001 UTC
10,000 kHZ WWV
IC-705: S3, very weak
IC-R8600: S7 to S9 but high atmospheric noise
Winner: 8600
Test #5
2021.02.18
2006 UTC
11,820 kHz Radio Riyadh
IC-705: S1, barely detectable
IC-R8600: S5 to S7, intelligibility unstable
Winner: 8600
Test #6
2021.02.18
2012 UTC
15,000 kHz WWV
IC-705: S3 to S5
IC-R8600: S9, slightly clearer and crisper tones
Winner: 8600, but not by much
Test #7
2021.02.18
2015 UTC
15,580 kHz VOA Selebi-Phikwe, Botswana
IC-705: S1 to S3, in and out with fading
IC-R8600: S9, much more stable signal
Winner: 8600
Test #8
2021.02.19
00016 UTC
7,780 kHz WRMI Slovakia International
IC-705: S9 solid, stable signal
IC-R8600: S9, same
Winner: Tie
Test #8
2021.02.18
0022 UTC
6,604 kHz USB Gander VOLMET
IC-705: S5 to S7
IC-R8600: S9
Winner: Tie, no real difference
Test #9
2021.04.09
2335 UTC
11,940 kHz Radio Exterior Espana
IC-705: S5 to S9 solid signal with some fading
IC-R8600: S9
Winner: Tie – no obvious difference
Test #10
2344 UTC
9,420 kHz Helliniki Radiophonia, Greece
IC-705: S9 +20. Excellent signal
IC-R8600: S9+ 20-30. Excellent signal
Winner: Again, a tie. But the wonderful Greek music reminds you again how much better the speaker is on the 8600.
Overall
Here’s the important thing: even though in most cases the IC-R8600 pulled in a much higher S meter reading, it often didn’t matter unless the difference between the two radios was a lot. In cases where it mattered, I could have turned up the RF gain or preamp on the 705 to match the signal on the 8600 (unless it was really weak on the 705), but I was trying to avoid that for the sake of having some baseline for comparison. How comparable are RF gain levels across ICOM radios?
IC-705 pros/cons take aways for me:
High level of portability and ability to operate on battery
Has desktop-like features and controls
Ability to use tripod or custom stand offers custom ergonomics (I found it easier to look at and interact with than the 8600, which has a lower angle of display)
All-in-one package: SWR + HF/VHF/UHF transceiver
Built-in audio speaker leaves a lot to be desired, definitely not desktop receiver audio quality
No stereo headphone jack
My verdict
I am quite impressed with the IC-705! I am looking to downsize my radios and these comparisons have convinced me that the 705 can really check a lot of boxes for what I am looking for in a radio. I think it really offers a lot in a small footprint, which I find very impressive. So, since I have no use in monitoring anything above UHF, I will be looking to sell the IC-R8600, even though it is also a very great radio.
All the best,
Giuseppe
Fascinating report, Giuseppe! Thank you so much for taking the time to perform these comparisons and sharing them with us.
Like you, I believe the IC-705 could replace a number of my other radios. I originally purchased it for my review and planned to sell it after, but quickly realized there’s no way I’m selling it. In fact, it could convince me to sell other radios it effectively makes redundant.
For SWLs who have limited space for a listening post in their home and who like to take their radio to the field, the IC-705 is a no-brainer. It’s an investment at $1,300 US, but I believe it’s a quality rig and certainly an outstanding, feature-packed unit.
I’ve found that the IC-705’s performance on HF and Mediumwave is truly DX-grade. I imagine its FM performance is as well.
It’s funny that you mention the IC-705 front-facing speaker as a con, because I often tout it as a pro. Thing is, I’m most often comparing the IC-705 with other field-portable QRP transceivers. Compared with them, the IC-705 speaker is amazing. But compared to the IC-R8600 or, say, a Drake R8B or SW8? Yeah, I agree with you 100%–it’s just not in the same league with those tabletop receivers. Of course, you can port out the audio to a better speaker if needed. (Indeed, the IC-705 even has built-in Bluetooth!)
Thanks again for sharing your notes with us, Giuseppe!
I took delivery of the Tecsun H-501x yesterday morning and the Sangean ATS-909X2 last week.
I’ve been waiting for these portable receivers for what seems like ages, and both arrive within one week of each other.
My initial impressions are positive for both radios, but I know it’s time to start some proper comparisons.
These portables are arguably the flagships of both manufacturers, so I decided to pit them against a “legacy” portable that has a reputation for eating other receivers for lunch: the Panasonic RF-B65.
“Nom nom nom…”
I fully expect the RF-B65 to emerge as the leader of this pack on shortwave in AM mode. No kidding. That’s why it’s a benchmark. If you can out-perform the RF-B65, you’re a five-star, Holy Grail portable and that’s the end of the story.
Where both the H-501 and ATS-909X2 will have an advantage is in audio fidelity. Both have excellent built-in speakers.
In addition, while the Panny RF-B65 is a great AM mode radio, it has very basic BFO controls and fine tuning for SSB. No doubt, I’ll likely pull out a different receiver for SSB comparisons.
DanH expects his ATS-909X2 back from firmware update soon and I look forward to his evaluation.
I plan to write a review of the Sangean ATS-909X2 for the June 2021 issue of The Spectrum Monitor magazine. My Tecsun H-501x review may appear in TSM as well.
I will post updates here on the SWLing Post and possibly some comparison audio/reception examples.
Tecsun H-501x availability
SWLing Post contributor, Troy Riedel, received word from Anna at Anon-Co that they hope to have their first batch of H-501x units available to ship by the end of April 2021. Pricing has not yet been firmed up.
Many thanks to SWLing Post contributor, Dan Robinson, for the following guest post and review:
The H-501: Jewel in the Tecsun Crown, With Some Attractive Features
by Dan Robinson
Since 2020, there has been one Tecsun receiver I have been most looking forward to reviewing, and that is Tecsun’s H-501.
Videos showing the pre-production and mainland China versions of the 501 started appearing online at least a year ago. There are also numerous videos showing comparisons between the H-501 and PL-990x as well as the PL-330.
What I will do here is provide an assessment of the 501 informed by my use of a H-501 just received, the other two Tecsun receivers, and my decades of experience using a wide range of portable receivers. This review is based on initial tests of a H-501x, among the first production units.
Video: Unboxing
HOMAGE TO RECEIVERS OF THE PAST
The elephant in the room with the 501 is, of course, its two large left and right speakers. This reminds one of another Tecsun DSP portable, the PL-398BT with a similar left-right speaker arrangement.
On the left of the H-501, from the top, are the Volume, Treble, and Bass knobs which like the PL-880 and 990x has obvious lineage back to the famous Grundig portables of the 1990’s – the Satellit 500 and 700. Both of those were limited to two bandwidths. Only the 700 had anything approaching usable synchronous detection.
Each of the left hand control knobs on the 501 contains a dot to indicate where you are in the Maximum/Minimum range. At the bottom of the left side is a micro-USB port for when the receiver is used as a computer speaker – quite a nice feature!
On the right side of the 501 you find ports for AM and FM antennas, each with a rubber traction cap, similar to what is found on the PL-990x. There is also a three position sensitivity sliding switch for Local, Normal, and DX modes – that’s one more than usually found.
Knobs on the right side are the Main tuning and Fine tuning, again similar to the PL-990x. At the very bottom of the right side is the 5v 1.0 amp micro-USB charging port.
ERGONOMICS
NEGATIVE: Here I discuss one of two major negatives with the 501. The tuning knobs are embedded quite far into the radio body. Each has a round piece of rubber covering on the knob end surface designed obviously to provide traction, possibly also as a protective measure.
The reality is that on the 501, more seriously on the PL-330, embedding of the knobs so far into the cabinet makes it virtually impossible to undertake rapid tuning using those knobs if you are just placing your finger on the top barrel part of the knob itself!
As you will see in photos and video accompanying this review, holding a finger against the rubber on the end of each knob, or closer to the center, to achieve more rapid tuning. But it’s kind of annoying. On the PL-990x the knobs are somewhat different – extending a bit farther out of the cabinet, but also with the rubber coverings.
So, this is a design point for Tecsun to consider. Surely, it should be possible to come up with slightly different knobs for the 501 that make it more comfortable to achieve rapid tuning. As it is, the knobs on the 501 barely extend beyond the cabinet edge, including the end and rubber cap.
The same goes for the PL-330 – which has knobs that only one half inch in depth, and extending only about 1/16 of an inch beyond the cabinet edge. Part of the attractiveness of the 330 is its compact size and I doubt Tecsun will be moving to put slightly larger knobs on that radio anytime soon. But as it is, using the main and fine tuning controls on the 330 gets you maybe 10 kHz in tuning range.
[UPDATE] I realized after further use of the 501x that Tecsun clearly intended for the rubber knob cap covers to act as traction for tuning. The problems I see: after significant use over time, those rubber covers will lose their stickiness and thus their ability to help tuning will be reduced. Also, the fine tuning knob is smaller — and even using the rubber cover on the knob for more traction, it is somewhat difficult to achieve rapid tuning in 1 kHz mode. Tecsun could help 501x owners on the issue with the tuning knobs by including spare rubber knob caps. But it’s uncertain how the existing rubber knob covers are attached to the original knobs and how easy it would be to replace them when they lose their stickiness.
H-501 IMPRESSIVE FRONT PANEL
At the top of the H-501 radio above the LCD display can be found the Display/Snooze/Lock button. On an older Tecsun radio, the PL-880, this button doubled as the calibration adjust control. On the PL-990x this triple function button is located on the top of the radio.
LCD DISPLAY
POSITIVE: One of the big positives of the 501 is the large LCD display. The number digits are absolutely huge and make it easy to read frequencies.
Thanks Tecsun! The display contains numerous bits of information about receiver operation, the signal strength meter, etc.
Below the display is the keypad, with special dual keys for 9/10 kHz mediumwave, Longwave activation, and FM range adjustment. Backlight activation is on the 5 key. At the bottom you have the VF/VM key to select between frequency tuning and memories. To the right are the FM, MW/LW, and SW + and – buttons. These put the radio into shortwave mode and as is the case with the PL-990 and other receivers, activate ATS/ETM tuning.
At the very bottom of the front panel can be found PLAY/PAUSE, RR, and FF buttons for control of SD card audio when using the microSD card, which like on the 990x is located on the bottom of the receiver. According to the manual, by the way, the microSD slot accepts cards of up to 128 GB. Included in the box is a 16 GB SanDisk Ultra card. A reset hole is also on the bottom of the radio.
Finally, at the bottom of the 501 face are rubber covered input ports for Earphones, Line In, and Line Out.
METAL TILT BAIL
POSITIVE AND NEGATIVE: On the back of the receiver, you find the metal tilt bail which folds down and locks into two plastic tabs and can be lifted easily with a finger from an indentation in the cabinet.
This was a good design move by Tecsun, with the following observations: there are no incremental positions on the metal bail as you find on, say, a Microsoft Surface or similar tablet type PC. The only fully stable position is to have the metal bail fully extended back. That places the 501 in a great position if you’re standing or even sitting to a degree. But if you try to place the bail in any middle position you’re in danger of having the radio become unstable. Tecsun should definitely give some thought to a re-design, though the bail is better than the flimsy plastic stands found on the PL-990 and PL-880 and some older portables.
Still on the back of the radio, intelligently, Tecsun marks a screw hole which can be used to remove the telescopic antenna (marked as ANT SCREW). The other screw holes for removal of the back of the radio are also clearly marked. Thanks Tecsun!
However, one additional partial negative – there are no rubber pads on the bottom back edge of the 501x which will be contacting whatever surface the radio is sitting on while the metal bail is in use. So, if you don’t want that bottom back edge to be scratched, place the radio on something to cushion it.
BATTERY CHARGING
POSITIVE: Another interesting feature not found on other radios: Tecsun has created a dual charging system for the 501 which uses two 18650 batteries.
In viewing numerous videos, I have not seen this discussed much. Basically, this enables you to use the receiver’s internal charging capability to choose which battery you are charging. The manual states that the battery contains space for a “spare” battery. The charging indicator on the LCD display will flash while charging is underway – there does not appear to be a separate display for battery A or B. However, and this is quite a unique capability – while you are using the 501x, the switch changes which battery the radio is using.
It’s not clear to me whether the receiver while powered on is taking energy from one or both batteries simultaneously. As I note in my reviews, and this is amplified in the manual, do not expect to be able to charge a battery internally and listen to the radio at the same time because there WILL be noise.
HUGE WORLD MAP AND RADIO DIAGRAM INCLUDED
Tecsun includes a huge – and I mean HUGE – World Amateur Radio map in a plastic pouch with the manual. On the back of this is a large photo of the 501 with clear English guide points to each and every feature of the radio. In this, Tecsun is really going out of its way to make owning the 501 a special experience.
In the box (see photos) Tecsun includes 2 18650 lithium batteries, a 5 volt double USB A charging cube, a mini to mini cord, a USB charging cable, and to boot, a pair of fairly high quality wired earphones complete with spare ear tips.
PERFORMANCE
Anon-co advises that the H-501x uses a different IC than the PL-990x. No further details were available as of the time of this writing.
This is clearly a sensitive radio, as is the PL-990X. In these days of declining use of shortwave, almost any receiver is going to be able to hear “stuff” all over the bands and the 501x and 990x as well as the 330 are all quite capable in this regard.
In the video, I tune some familiar stations, including Voice of Greece and BBC
and move through the excellent bandwidth options. This is where the 501, with its large dual speakers, excels because if you’re on a strong station – Greece is a great example because of its great music programs – and you have that wider option, it’s really pleasant to listen to.
NEGATIVE: However, one has to puzzle over the decision to limit bandwidth to 6 kHz when in shortwave mode. On mediumwave (AM) you have a 9 kHz option which provides some fine listening. Perhaps Tecsun felt that there are few stations using shortwave these days that would benefit from having a significantly wider option? I would urge Tecsun to make 9 kHz available in shortwave.
SYNCHRONOUS DETECTION
NEGATIVE: I really had some hope that Tecsun would go farther toward
solving the problem of unstable/distorted SYNC mode with all of these recent radios. Unfortunately, it was not to be.
Using SYNC on these radios – though this was not the case with the PL-660 and 680 – involves a delicate dance, requiring using a combination of bandwidth filters and LSB/USB. SYNC works fairly well with some stations, but it really depends on signal level, and to an extent signal level of any station close to the frequency you are on.
There is a 1 kHz fine tune spread when using SYNC after which lock is lost. And still, lock is often lost even when you’re on center frequency and not using
fine tune in SYNC – the signal just becomes distorted. Not fun. The PL-990x has the same issues.
Now, Tecsun has definitely made progress since the horrendous implementation of SYNC on the PL-880, which wasn’t even an official feature. But it’s disappointing that given the design features in the 501, especially the wonderful dual speakers, a way has not been found to resolve this issue which obviously involves the DSP chip that is the brain of the receiver.
Video: Detailed testing of Tecsun H-501x
ANTENNA
NEGATIVE: One of the things the folks at SONY, Panasonic and some other manufacturers did so well was design radios with antennas that nested inside the radio and could be pulled up and out of the cabinet, and because of this, there was clearance from the top of the radio so the antenna can achieve vertical position. Tecsun has not done the same. Antennas on the H-501x, PL-990x, PL-330 swivel but cannot take up vertical position, and of course they are nested on the top of the radio. One would have thought that after years of producing portables, and coming to dominate the portable market, someone at Tecsun would have recognized the importance of antenna re-design. NOTE: the antenna on the 501x is sufficiently long, but on the PL-330 for example, seems to be not long enough.
BLUETOOTH
POSITIVE: Hooray for Tecsun in integrating BT capability into the 501x and 990x. This was such an obvious move and thanks to Tecsun for really hitting it out of the park. Unfortunately, we don’t get the ability to record audio from the radio on to microSD cards – that would truly have been a major step forward
CALIBRATION
The H-501 has the same re-calibration adjustment feature as is seen in the PL-909x and the PL-330. This involves going into LSB or USB mode, holding down the USB or LSB keys until a flash appears, then using the Fine Tuning knob to achieve zero beat on WWV or strong station that is known to be on frequency, then holding down USB or LSB again to have the radio re-zero itself. This is a fine feature that we have seen since the PL-880.
When I first received the H-501 it appeared that the receiver was fairly on zero beat from mediumwave up through 25 meters shortwave. Further testing revealed that re-calibration was necessary, but the degree of error from mediumwave up through 19 meters was not as significant as I have seen on the PL-990x. Re-calibrating at a mid-point of 25 meters appears to be a good mid-point choice, but inevitably, doing re-calibration on shortwave will throw the receiver off by a bit down on mediumwave.
A cautionary note: when undertaking this calibration function be sure to give the radio time to confirm it’s in calibration mode with the FLASHing LCD. Sometimes, the readout will jump a full 1 kHz above or below the frequency you’re zeroing on – if that happens use the MAIN TUNING knob to get yourself back (i.e. 9,704 to 9,705.00) and complete the zero beat operation with the FINE TUNING knob, then hold down LSB or USB to complete.
All of this may be overkill for most people – I am just among those who obsess over having receivers as exactly on zero beat as possible. That’s more difficult or impossible to achieve with older receivers that have no calibration function, such as the ICF-2010 or SW-55 without literally taking those radios apart to access internal points of adjustment. The fact that Tecsun provides this capability in these portables is something we should all be very grateful for.
CIRCUIT LOCKUP
All of the Tecsun radios have a “reset” hole to be used if the receiver is not functioning properly. I had one occasion of lockup with this sample of the H-501x. Rather than using the reset hole, I decided to remove one of the two 18650 batteries, which of course reset the receiver. I have alerted Anon-co to this issue, but it’s hard to tell whether it’s a major problem without having other H-501 units to compare to.
CARRYING CASE
POSITIVE: The H-501 that I received for review from Anon-co came with a beautiful faux leather case complete with a convenient carrying handle. My understanding is that this matches mainland China versions that have been widely seen in videos online.
Anon-co advises that the first batch of 501x to be carried by them will come in a gift box with this PU leather case, possibly to be followed at some later point by a hardcover carrying case. Indeed, a photo can be found online showing the H-501 in a hardcover carrying case similar to the cases for the PL-880 and PL-990x kits.
As of early April, Anon-co advises that while the price for 501x is not set yet, it’s expected to be somewhere in the $310 – 330 range including shipping to the U.S.
AM/MEDIUMWAVE AND FM PERFORMANCE
Not much to say here – I find FM performance on the 501x to be superb, and mediumwave reception is more than satisfactory.
CONCLUDING THOUGHTS
As I noted earlier, these days amid declining use of shortwave by remaining broadcasters, almost any DSP or older portable receivers are capable of producing excellent results for shortwave listening.
Facebook groups devoted to shortwave (they have become the new gathering place and information exchanges for those of us who still love the hobby) are
full of newcomers inquiring about which Tecsun, Degen, or other portables are best.
Often, my advice is to consider older portables that are still quite competitive, especially considering the reduction in the number of stations still on shortwave. These would include such classics as the Grundig Satellit 700/500, the SONY
ICF-2010(2001D), SONY ICF-SW77, and ICF-SW55, along with the venerable Panasonic RF-B65 and SONY ICF-SW100S in the smaller category.
What Tecsun has done with what we have to assume may be the final group of DSP receivers it produces is come up with small (PL-330), medium (PL-990x), and large (H-501) radios that combine extremely attractive features and excellent audio. The H-501x, in effect, is a Grundig Satellit 700 re-born for the 21st century and the path to it was paved by the PL-880.
Though implementation of SYNC in each of these receivers still leaves much to be desired, having this feature is enough to push prospective buyers to choose one or more of these Tecsun units over older portables.
Note that Sangean, which is now producing its ATS-909×2 (though the radio has growing pains and is having its firmware updated by Sangean) seems to have taken note of Tecsun’s dominance of the market and provided multi-bandwith capability, and an improved and enlarged LCD display on the 909×2 along with finer frequency resolution.
In a strange but perhaps understandable decision, Sangean left SYNC mode off of its new flagship receiver. Whether this had more to do with production costs or a decision that synchronous detection really brings little to the game these days, or both, along with other factors, remains a puzzle. It does appear, from early reviews, that Sangean may have improved sensitivity on the 909×2, though this too remains unconfirmed.
But again, even with the negatives I noted here about the H-501x, what Tecsun has accomplished is significant. It has given remaining potential buyers of multi-band portables three superb receiver choices. There are others in the Tecsun line such as the S-8800 and S2000, but of these only the S8800 is something I would recommend.
As I noted in a recent review of the PL-330, had we enjoyed a situation back in the golden days of shortwave in the 1960’s/1970’s/1980’s where a portable provided multiple bandwidths, advanced memory operations, and synchronous detection, DXing would have been even more of an enjoyment than it was. Certainly those Country Heard/Country Verified totals would have been higher!
The H-501x could easily be considered the crown jewel in the Tecsun group with its killer looks, large speakers, and performance equaling the PL-990x. Each of these receivers is arguably an easy choice as a “daily driver” for traveling, though where air travel and TSA issues are concerned, the PL-330 would be a better choice.
RECOMMENDATION: Of the negatives I discuss in this article, only one I would consider fairly huge, and that is the ongoing issue with synchronous detection. If the 501x, like the 990x and 330, were to have this issue resolved that would make it easy to recommend any of the three radios. As it is, the attractiveness of the 501x lies with its beautiful two speaker design. Even with the annoying SYNC issue, I would recommend the radio to anyone who understands the SYNC issue and doesn’t mind and who wants a nice, larger version of the 909x.
Many thanks to SWLing Post contributor, Dan Robinson, who shares the following guest post:
Tecsun PL-330: The Powerful Mini With One Serious Design Issue
by Dan Robinson
As SWLing Post readers know, I have a huge radio collection – including premium receivers and portables, now nearly 100 in all.
So, these days I am hesitant to add too many, but I continue to take interest in what companies such as Tecsun and Sangean are doing in the way of stuffing the latest chip technology and capabilities into portables radios.
The last receivers I reviewed included the Tecsun PL-990x, which has developed quite an enthusiastic following since its consumer version was released in 2020, and the Tecsun S-8800.
Out for some time now is the Tecsun PL-330. By now there are many reviews of it on You Tube and elsewhere.
It’s become a familiar observation for many of us – if this were still the 1960’s and 1970’s – even into the 1980’s, which could be considered the golden days of shortwave and we had receiver technology like this, well what a joy that would have been.
When I traveled around the world both before and after college, and professionally for Voice of America in the 1980s and 1990s, wow what a good time I could have had with today’s portables!
Some world band portables radios back then were superb performers. The Grundig Satellit series 500/700/600/650 come to mind – but these were not exactly what I would call small portables.
Paging through Passport to Worldband Radio from 1990 (wow, that’s 30 years ago!) you see others such as the SONY SW-1, Panasonic RF-B65, and of course, the SONY ICF-2001D/2010 which introduced killer synchronous tuning technology in the 1980s and remains popular today decades after it first appeared.
Also available were the SONY ICF-SW55 and later in competition with the 2010, the SONY ICF-SW77. Today, I have four SW-55s and two SW-77s and still use them regularly.
Tabletop receivers back in the good ol’ days offered multiple selectivity positions. One of those was the Lowe HF-225 (and later Europa version) along with the HF-250, Kenwood R-5000 and R-2000, ICOM IC-R71A, and Yaesu FRG-8800 among many others.
But as far as smaller portables go, features such as synchronous detection and multiple selectivity were still pretty limited, and a number of receivers didn’t offer selectable synchronous as was eventually offered on the Drake R8B and later production of the SW-8.
The RF-B65 by Panasonic – which today remains sought after for its amazing sensitivity – was hobbled by having a single selectivity position. Same with SONY’s SW-1 and SW-100, and 7600GR, though SONY’s PRO-80 had two bandwidths.
Indeed, it wasn’t until Eton brought out the E-1, with its three bandwidths combined with Passband Tuning (though no notch filter) that a portable finally reflected capabilities of some of the better tabletop radios (though lacking a notch filter).
The Grundig Satellit 800 was close in competition with the E-1 (though the earlier Sat 600/650 series also had multiple bandwidths) but was bulky.
Fast forward to 2021 – credit due to Tecsun and more recently to Sangean with its 909X2, for some years now we have enjoyed Asia-originated portables with multiple selectivity and synchronous mode, though sync implementation on some has left much to be desired.
Which is where the PL-330 comes in. When I look at the 330, I am reminded of one of the now ancient SONY portables, the ICF-4920 which was a super small slide-rule receiver that nevertheless was quite sensitive.
Like the 4920, which you could easily slip in a pocket, the PL-330 is a perfect travel portable. Only the Belka-DX SDR and still wonderful SONY SW-100 compete in terms of performance and size.
The 330 is basically a PL-990x in miniature: smaller speaker obviously, shorter antenna, no bluetooth capability or card slot. But as many people who frequent the Facebook groups have observed, pretty much anything the 990x can do, so can the 330.
This radio has ETM/ATS tuning, synchronous detection, multiple bandwidths in AM, SSB and MW, FM mono-stereo speaker control, alarm/timer functions, external antenna jack, display light, and other features.
Tecsun decided to go with a BL-5C battery here – the same with the new PL-368. I think this is unfortunate, since it requires one to obtain a number of those flat batteries if you want to travel and not have to re-charge. On the other hand, this is not a crippling design decision.
What is an unfortunate design problem, in my view, involves the simple question of tuning the receiver.
The main and fine tuning knobs on the right side of the PL-330 are embedded into the cabinet just far enough as to make easy rapid finger tuning of the radio nearly impossible.
In fact, in my testing it’s impossible to thumb tune the radio more than 10 kHz at a time. The same applies to using the lower knob which controls volume. When in FM mode, this issue make tuning just as frustrating almost forcing one to use rapid scan mode.
Another puzzler: Tecsun limited bandwidths in AM SW to three, while in SSB you have 5 bandwidth options. In AM mode, you have a 9 kHz bandwidth, another puzzling choice. Longwave too is limited to 3 bandwidths.
But overall, none of these problems really knock the PL-330 down very far. This is one mini powerhouse of a radio, one that makes you think “wow, if I had just had this back in 1967 or 1973 or 1982.
Some additional thoughts. My particular PL-330 was supplied by Anon-co but is a pre-production version and so does not have the latest firmware. Thankfully, I have not experienced the issue of SSB tuning running in reverse as others have.
NOTE: As most users know by now, but some newer users may not, you cannot charge one of these radios – whether Tecsun or Sangean – using the mini-USB port and use them at the same time. . . there is just too much noise introduced from the charging process.
This little mentioned feature: just as the Tecsun 909x has a re-calibration function, so does the PL-330. Tecsun itself initially declined to acknowledge this, but finally confirmed through Anon-co.
The procedure: Switch to LSB/USB. If the station is not zero beat, hit STEP button once and then quickly again to move the flashing display down arrow so it’s above the far right digit. Then fine tune the station for zero beat. Hold LSB or USB in for a couple of seconds. The LCD blinks. You then have zero beat – but be sure to repeat the process for LSB and USB.
I should mention that just like on the 990x, the re-calibration process doesn’t mean the receiver is then zeroed up and down the shortwave bands. You will likely have to repeat the process from, say 25 meters, to 19 meters, to 49 meters, etc.
I have come to enjoy using the PL-330 here in my house, though like other portables in my collection I need to position it in one particular corner of my home away from incoming cable TV lines.
The PL-330 and the Belka DX are currently king of the pile when it comes to my smaller travel portables.
I fully expect there will be no further receiver development by Tecsun after the PL-330/990x/H-510 radios – but that company will certainly have left us with some great receivers as the days of shortwave approach an end.
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