Tag Archives: PL-368

Additional Hidden Feature of Tecsun PL-368

For potential Tecsun PL-368 owners, this is an exciting update! I just received the email below from Anna at ANON-CO:

Hello Robert,

I just wanted to let you know that we are expecting to receive our PL-368 radios around the middle or end of next week. It turns out that these radios will have one (hidden) feature that was not included with the “final” version that you receive in June, and that is a calibration feature for SSB.

If you have any questions please feel free to let me know.

Best regards,
Anna

This is a feature in some of the latest Tecsun models, and seemed odd to not be included in the PL-368, so this is good news indeed!

Cheers, Robert

Robert Gulley, K4PKM (formerly AK3Q), is the author of this post and a regular contributor to the SWLing Post. 

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Dan reviews latest firmware version of the Tecsun PL-368 and shares list of hidden features

Many thanks to SWLing Post contributor, Dan Robinson, who shares the following guest post:


Revisiting the Tecsun PL-368:  Assessing a Later Firmware Unit

by Dan Robinson

This past April, I reviewed Tecsun’s PL-368, the update of the PL-365 (also sold by CountyComm as the GP5).  There were some major changes:  Tecsun shifted from AA batteries to a flat BL-5C cellphone type battery, and of course the marquee design change was the addition of a keypad.

The keypad is a night and day change – whereas before the PL-365 was a handy receiver but hobbled by archaic tuning limited to memory access and the side thumb wheel, the 368 provides easy instant frequency selection.

In my previous review, I mentioned the well-known characteristic of the 360 and 365 models which exhibited over-sensitivity to the touch.  When removing your hand, signal levels plummeted – usually, a full grip was necessary and any variation caused reduced sensitivity – noticed mostly in shortwave mode.

The PL-368 I reviewed was from among the first versions of the receiver.  It had a firmware of 3681, from a 2020 production run.  Recently, I received from Anon-Co – the most reliable supplier of Tecsun receivers – an updated unit, with firmware 3684.

Please see my previous review for comments on various aspects of the 368: the longer but less robust telescopic antenna, addition of detents on the volume wheel, and the welcome addition of adjustable bandwidths, synchronous detection, and ability to tune in 10 hz increments, and other changes.

PROBLEMS

SYNCHRONOUS DETECTION:  As with the 909x and H-501, the upgraded 368 now has Synchronous Detection.  I did not expect any change in the 3684 firmware – SYNC still has some distortion and loss of lock.

As with the 330, 990x, and 501x successful use of this mode requires a delicate dance involving careful selection of various bandwidths while in SYNC mode and fine tuning.

However, whereas on the previous 3681 unit there was significant “warbling” when in SSB and SYNC, and phonics when touching the keypad, the 3684 unit has little to no such warbling and the phonics appear to be gone, or minimized.

It’s not known what Tecsun may have done to address these issues – my review of a previous 3681 firmware unit was published in April, so it’s hard to think that Tecsun made any major physical changes to the PCB/keypad and radio body.  But there does seem to be some improvement.

I had no expectation that a firmware change would result in any improvement in the other major issue common to the 360 series – reduction of sensitivity when the receiver is not being held in the hand.

The 368 still shows a noticeable reduction in signal strength, visible on the display, when left standing on its own versus being fully gripped.  But the problem does not seem to be as serious as it was with the PL-360/365.

And since my first review of the 368, I have done some additional comparisons with older portables which were constructed with more robust cabinets.  Some of those also exhibited reduced sensitivity when not being held.

For the PL-368 with firmware 3684, the headline really has to be the apparent disappearance of the “phonics” when tapping the keypad and cabinet top surface.  This was the elephant in the room on the first very early sample of the PL-368.

While there is still distortion using SYNC mode, this issue seems to have been slightly reduced with the latest firmware.  Without confirmation by Tecsun, there is no way to know what specifically may have been done to impact the SYNC issue in a positive direction.

A major disappointment is confirmation from Anon-Co via Tecsun that the re-calibration function seen in the PL-330, 990x and H-501x is absent from the PL-368.

That leaves a user with only the fine tuning option in SSB.  This is a real puzzler, since surely Tecsun could have enabled re-calibration on the 368 in the same way it did with the other receivers.

SUMMARY

I stated in my first review of the 368 that this receiver would be an automatic must-buy in my book, were it not for the earlier issues of cabinet phonics and signal level reduction when the radio isn’t being fully gripped in hand.

One hopes that the phonics issue has been fully addressed by Tecsun.  It’s possible that my initial early unit of the 368 had some weakness in the PCB for the keypad, and LCD display that has been recognized and corrected.

Without confirmation from Tecsun, it’s also difficult to declare that the 3684 firmware has truly brought about a measurable improvement in SYNC and SSB.  But based on my testing of this particular 3684 firmware unit, the radio is more usable and tolerable in SYNC and SSB.

And of course, addition of the keypad along with multi-bandwidth options moves the 368 firmly into the same zone as Tecsun’s other portables, albeit perhaps more in the “prepper” category.

There are so many offerings now from Tecsun in portables that it’s hard for me to place the PL-368 in the “must-buy” category, especially since the PL-330, 990x and H-501x bring so many superb features to the game.

But the PL-368 has a certain appeal – its walkie-talkie style design makes it an easy quick-grab for trips, similar to the PL-330, though the 368 can not really be safely balanced on a flat surface and is best used with some kind of stand.

In terms of raw performance, one has to observe that the wonderful Belka DX has to be considered as a top choice and major competition when it comes to extreme portability and top performance, especially with the available speaker/battery backs.

And the PL-368 still has major competition from the XHDATA D-808 (now appearing under the RADIWOW SIHUADON label) with excellent AIR band capability and multiple bandwidths, though no synchronous detection.

To “save” the PL-36xx series, Tecsun will have to ensure steady QC (quality control) in manufacturing and when possible, further firmware updates of the 368, as with all Tecsun receivers.


Preliminary List of Hidden Features for PL-368

Source: Anna at Anon-Co

Switch between internal ferrite rod and whip on AM (MW & LW)

1. Select the MW or LW band.
2. Press and hold key ‘3’ for about 2 seconds.

When the display briefly shows “CH-5” this means that the device is set to MW/LW reception using the telescopic antenna. The display shows MW (or LW) and SW on the left side of the screen.

When the display briefly shows “CH-A” this means that the device is set to MW/LW reception using the internal ferrite antenna. The display shows only MW (or LW) on the left side of the screen.

Adjusting the maximum volume level

Select the frequency band, then press and hold key ‘7’ for 2 seconds until a number is displayed. At this moment, rotate the [ TUNING ] knob to adjust and press the key ‘7’ again to save and exit.

Firmware Version

In power-off mode, press and hold [ VF/VM ] for 0.5 seconds until all characters on the display are shown, then wait a few seconds until the firmware version is briefly displayed at upper right of the display.

Extend SW-range for European setting (1621-29999 kHz)

1. In power-off mode, press and hold the [ 3 ] key to set the MW tuning steps to 9kHz.
2. Select the SW band, and then press and hold the [ 5 ] key for 10 seconds to enable/disable the SW frequency extension.

The starting point of the SW frequency range will become 1621 or 1711 kHz.

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Dan reviews the Tecsun PL-368: “Large Receiver Features In Smaller Vertical Handheld”

Many thanks to SWLing Post contributor, Dan Robinson, for the following guest post and review:


Tecsun PL-368Tecsun PL-368:  Large Receiver Features In Smaller Vertical Handheld

by Dan Robinson

It was back in 2020 that the first photos surfaced online of the PL-368 – posted on Facebook by someone attending the electronics fair in Shanghai, China.

Photos showed the successor to the PL-360/365 receivers – and also the PL-990, successor to the PL-880, as well as the new king of the hill for Tecsun, the larger dual speaker H-501.

Things looked promising, and it was pretty exciting.  Tecsun designers upgraded the PL-365 which had become a favorite of preppers and SWLs, but which was hobbled by the lack of a keypad, to the re-named PL-368.

The PL-365 and PL-360 before it were plagued by the problem of being overly sensitive to the touch – when holding the radio, reception was fine, but remove your hand and signal levels plummeted.  Usually, a full hand grip was necessary to obtain full sensitivity and any variation in grip reduced sensitivity – this was noticed mostly in shortwave mode.

Previous 360/365 models were known for the included small rotatable ferrite

AM amplified antenna which performed miracles in nulling mediumwave stations – for those who still like to listen to the AM band.  The 368 also comes with this additional ferrite antenna.

And the 365/360 (which were and still are sold by CountyComm as the GP-5) used AA batteries, making it very easy to find replacements anywhere the radio is being used in the field.  Tecsun changed that on the 368.

After the photos appeared, I contacted Benny Zhao, who had posted them on one of the Facebook groups and asked if he could send me a sample of the PL-368.  He obliged and a 368 was sent on its way.

The radio was sent without the BL-5C flat lithium battery which was prohibited in postal shipments.  It took a long, long time (3 months, apparently the package was sent by snail mail) but it finally arrived here and I have been putting it through some tests.

Tecsun PL-368

The PL-368 that I received has the notation “2020.12 VER 1” so it’s clearly a first version from 2020 production.

Tecsun PL-368

Like the models before it is a great, handy, portable to grab if you’re going on a trip.  It is lighter than the older 360/365s.  The change from three AA batteries to the flat BL-5C explains some of that.  There is a heft to the older models that the 368 doesn’t have.  I am not sure about differences in thickness of the 368 cabinet.  Perhaps we will find out more from Tecsun (see notes below regarding issue of tapping the front of the 368 cabinet).

Tecsun PL-368

The 368 retains the two multi function adjustment wheels on the right side, one for Volume, the other for Tuning.  These are also used for time and bandwidth control.

Tecsun PL-368

Tecsun PL-368 (left) and PL-365 (right)

On the 360/365 radios, I never found the tuning wheel approach to be particularly efficient since it was limited to a certain number of kHz per turn, either 5 or 1 kHz depending how fast you turned.

On the 368 it appears you can obtain up to 40 kHz from a single turn of the wheel, while on the 360/365 that was limited to 15 to 20 kHz depending on the speed you were turning.

Tecsun PL-368

Tecsun PL-368 (left) and PL-365 (right)

The antenna on the 368 is thinner, but 8 inches longer than the 360/365 models, and in the box you will find the included and very effective rotatable ferrite antenna for mediumwave that inserts in a jack on the top.

On the 368 the volume wheel has detents, whereas on the 360/365 the wheel had smooth turning.

We have gone from 14 buttons on the old PL-360/365 models to 28 buttons on the PL-368, including addition of the keypad.

UPGRADES

Tecsun PL-368

Tecsun has upgraded the 368 in line with improvements seen in the PL-990x and H-501 receivers.  There are now adjustable bandwidths – a particularly useful tool.  These bandwidths also operate in SSB, something that the new Sangean ATS-909×2 doesn’t offer.  Bandwidths are:  LW/MW 2.5, 3.5, 9.0  SW: 2.5, 3.5, and 5.0 SSB: 0.5, 1.2, 2.2, 3.0 and 4.0 kHz

Also in the 368 is now synchronous detection, a feature left off Sangean’s 909×2.  And you get the same intelligent tuning features seen in the 909x/501x models as well as the previous PL-880.

Tecsun added a control that enables activation of the light – this is located on the same button as the Step control which adjusts the tuning steps.

The 368 display now has the ability to tune in 10 Hz increments, an overdue upgrade from the 360/365 models.

Charging of the BL-5C battery can be carried out by connecting a DC 5V/0.5A adapter to the micro-USB port on the side of the radio.  The English manual notes that when charging, the charging time is displayed at the top right corner of the display while the “Charge” indicator flashes.

Adjustments for 9/10 kHz mediumwave, Longwave, and FM frequency range can be found on the 1, 2 and 3 keys.

The manual notes that in addition to the internal ferrite bar antenna, the external supplied MW/LW ferrite antenna can be connected to the antenna socket on top and rotated to obtain optimum reception.

Addition of the keypad makes the PL-368 far more useful than its predecessors for instantaneous frequency access.   This was the major drawback of the 360 and 365 receivers.  This can’t be emphasized enough.

This is a day versus night difference and vastly improves the attractiveness of the 368 over previous models.

There are 850 memory presets, 100 for FM/LW, 150 for MW, 300 for SW, and 100 each for SSB and SYNC.

ATS tuning, like the 990x and 501 receivers enables ATS within all meter bands by holding the [<] or within a selected meter band by holding the [>].  The manual also notes the ability to auto scan all stored stations within a frequency band or mode (SYNC/SSB) staying on each station for about 5 seconds before resuming.

The 368 has what Tecsun now calls Enhanced Tuning Mode (ETM+) – as explained in the manual, this allows auto tune and storing of FM, LW, MW and SW stations into ETM memory.  Unlike ATS, scanned stations will not be stored into regular memory (VM) – in this way, when in a different city or country, ETM+ can be used to auto search new stations without overwriting any previously stored stations.

FM De-emphasis Time Constant – as explained in the manual, while receiving FM broadcasts, long pressing [4] will adjust the de-emphasis setting for Europe, Australia, Japan (and most other locations), or for Americas and South Korea.

Add Seconds to the Clock – with the device powered off, press and hold [8] to add seconds to the clock.

Sleep Timer – as with its predecessors, the 368 has a Sleep Timer, with an indicator on the LCD display.

Alarm –  and like earlier models, there is also an Alarm function, which allows the radio to turn on at a preset time.  It’s possible to select a specific frequency to be used with the Alarm.

RE-CALIBRATION –  I have not been able to determine yet if the 368 has a re-calibration function as can be found on the PL-330, 909x, and H-501.

PROBLEMS

Let’s get one headline out to start:  The 368, as with the 909x and H-501 all have the useful Synchronous Detection mode.  However, SYNC continues to be hobbled, showing distortion and loss of lock.

As I have mentioned in reviews of the 330, 990x, and 501x any successful use of SYNC requires a delicate dance involving careful selection of various bandwidths while in SYNC mode and fine tuning.

The 368 manual contains 3 pages of explanation of SYNC noting that it can “eliminate distortion generated in the IF filter due to local fading, slight offset, modulation overshoot, as well as inter-channel interference and cross-talk modulation, and can also reduce noise interference.”

The problem with all of the Tecsun DSP chip receivers after the PL-880, which had a hidden SYNC feature that was the worst of the bunch, is the extent to which SYNC still suffers from distortion and loss of lock that renders the feature far less useful than it could be.

Ideally, one would want SYNC to match the capability achieved in such older receivers as SONY’s ICF-2010, SW-100S, SW-07, 7600GR.  You’re not going to get that with Tecsun receivers.

Like its predecessors, the 368 is still sensitive to touch.  I noticed this immediately on the old 360/365 receivers, especially when using the radios

at the beach.  If I was recording a station on shortwave, and left for a few minutes, I would return to find that sensitivity had dropped because the radio was not still being held in the hand, which rendered the recording useless.

I am continuing testing of the 368 to try to determine if this issue has been reduced to any extent and will update this review with any further findings. This sensitivity issue is not specific to the 368 – it can be seen on other older and newer receivers.

Many older portables (the SONY ICF-SW55 comes to mind) were constructed with robust cabinets that were less sensitive to touch.  Touching the whip antennas on some older receivers improved reception, while on others touching the whip antenna actually reduced sensitivity.

URGENT ATTENTION FOR TECSUN:  My initial testing of this particular China market unit of the PL-368 – again, it is marked as December 2020 Version 1 production – identified an additional issue.

When in SSB modes or SYNC, tapping on any area of the keypad and LCD display produces a warbling/distortion effect in the audio.  One can only surmise that this is attributable to insufficiently robust construction of the PCB board underneath.

(Video shows problem created when physically tapping front of PL-368 cabinet.)

This is NOT a problem seen with my PL-365 when it is in SSB mode.   

I hope that Tecsun gives this the attention it needs and corrects the problem in future production runs.

SUMMARY

Tecsun PL-368Were it not for the major problems detailed above, the PL-368 would be an automatic must-buy receiver in my book.

Addition of the keypad is a night and day improvement and when combined with additional features such as multi-bandwidth options and the still-to-be-perfected synchronous detection, the 368 would be a killer portable.

But as with the PL-330, 909x and 501x the problem with SYNC mode is still a major drawback on a feature that is supposed to lift Tecsun receivers out of the pack of portables that are on the market in 2021.

One can live with the issue of cabinet sensitivity – but the additional issue I identified where there is instability introduced when tapping on the front panel/keypad/LCD is a QC problem that simply must be addressed by Tecsun.

But as I have said in reviews of other Tecsun receivers, let’s back up a bit.  Imagine if we had had portable receivers with the capabilities that these have, back in the 1960’s or 1970’s.

It’s one of the great ironies of the radio listening hobby, that in 2021 any company is willing to continue producing receivers of this caliber as use of shortwave by major broadcasters continues to decline.

The obvious other killer feature to include in portables such as this would be to somehow integrate DRM into them.  However, I have a feeling that will never happen

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Video: Nick compares the new Tecsun PL-368 with other portables

Many thanks to SWLing Post contributor, Nick Booras, who writes:

Hi Thomas

I posted a video of this radio compared to a couple other popular radios. Thought your viewers might be interested. This 368 is a significant improvement over the 360 and 365.

Thank you so much for sharing this, Nick! People who love the form factor of the PL-360 and PL-365, should appreciate the new Tecsun PL-368. Thank you again!

Click here to check out the Tecsun PL-368 on eBay (partner link supports the SWLing Post).

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The Tecsun PL-368 is now on eBay

Many thanks to SWLing Post contributors, Tom, Markku, Dave Zantow, and Dan Robinson who note that the Tecsun PL-368 is now available via sellers on eBay.

Fans of the Tecsun PL-360 and PL-365 will be happy that among other things, the PL-368 has sync detection. The price is $88 US plus $3 shipping from China.

Click here to view on eBay.

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New Tecsun PL-368 prototype on display at 2020 Shanghai International High-End Hi-Fi Expo

Many thanks to SWLing Post contributor, Dan Robinson, who shares the following photos and short videos of a prototype Tecsun PL-368 at the 2020 Shanghai International High-End Hi-Fi Expo.

The PL-368 appears to be the updated and upgraded model of the Tecsun PL-360/PL-365 series.

Something I note immediately is the most welcome addition of a numeric keypad for direct frequency entry:

In addition, there’s a “Sync” button indicating the PL-368 will sport synchronous detection, hopefully, with USB/LSB selectable sideband.

Photos

Note, all of the following photos and video were shared by Benny in the Tecsun PL-880 group:

Videos

Dan also shared the following short videos (click links to view):

Many thanks to Benny for sharing these photos and videos from the Expo and thanks to Dan Robinson for sending them to us.

When we learn more about the PL-368, we’ll post details on the SWLing Post. Just follow the tag: PL-368

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