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Dr. Bertalan Eged of Spectrafold Technologies recently contacted me regarding a new military grade SDR they’ve produced: the Quadrus SDR. Today is the Quadrus official release.
The Quadrus SDR has phase-coherent multi-channel capabilities with up to 16 channels, which means that it can be used for direction finding, diversity reception, as well as MIMO applications.
While the Quadrus line is aimed squarely at government and scientific research markets, the $1490 US Quadrus DRU-244A-1-1-PCI, a four-channel SDR, might appeal to the discerning DXer, amateur radio operator, or radio experimenter.
Below, I’ve posted the full press release from Spectrafold Technologies along with several photos and screen shots.
Since I’m not a radio engineer, I’ve asked a representative of Spectrafold to answer any questions you may have about the Quadrus SDR line and its receiver architecture.
Military-Grade Software Defined Radio Receiver Platform
Now Commercially Available for Building Better Receivers
Phase-coherent, Multi-channelQuadrus Platform Brings New Features to Commercial Market
Spectrafold Technologies today released the Quadrus software defined radio (SDR) platform for commercial use, enabling access to advance, professional-grade platform for signal intelligence, spectrum monitoring communications systems and missions. The long-standing platform has features are still unmatched by other commercially available products, and include four cutting-edge, phase-coherent antenna inputs with 16 bit, 80 MSPS; high-sensitivity, high-dynamic range Analog-to-Digital Converters (ADCs) driven by a low phase noise; and high-stability sampling clock. The input signal chain also contains a Low-Noise pre-Amplifier (LNA) and an input leveling attenuator providing the necessary sensitivity while still maintaining the proper input drive. The architecture provides the capability of using high gain antennas, and standing against the overload by the crowded radio spectrum.
“Today there is strong international community of radio enthusiasts and listeners using SDR technology, looking for platforms that implement advanced radio signal processing algorithms,” said Dr. Bertalan Eged, chief architect of the Quadrus. “Physically and logically phase-coherent multi-channel SDR platforms provide the capability to implement various algorithms and receivers such as diversity reception, interference cancelling, beam forming and correlative receivers. These applications can help to deliver better sensitivity, more stable fading free reception, longer connectivity and collecting more information on the radio signal environment.”
The platform input bandwidth is wide enough to be used up VHF/UHF bands as Direct Digital Receiver (DDR). The samples are fed into an FPGA, where a non-blocking switch matrix is used to forward them to the input of the four on-board receiver signal processors. The on-board processing is capable of forming a 16 multi-channel receiver. The platform also features a standard PCI interface for PC integration, and comes with a Windows®32 bit kernel driver and fully open API, which can be downloaded from the website along with the operating SDR software. The SDR receiver software has remote control capability for system level integration via TCP/UDP/IP links. Further details on these capabilities are available at the Spectrafold website. The system has spectrum recording capability to binary files, some example can be downloaded for evaluation purposes.
The Quadrus API is available as a Windows® DLL, and developers and system integrators may download it from the SUPPORT page on the Spectrafold website. The hardware API is meant for direct hardware access, but a higher level remote control interface API is available as well, which can be used to (i) set up the receiver channel parameters and to (ii) access the IF as a UDP/IP stream. If you prefer to not use any of these methods, it is possible to fall back to a virtual audio card connection between the SDR software and external applications, like decoders and post processors.
Additional information on the performance and usage scenarios is available in the BLOG. Users interested in experimenting with the hardware can gain access to remote access to a computer with SDR hardware digitizer and installed SDR software. Interested parties should contact the team by email: [email protected]
Hardware orders may be placed through the manufacturer’s ORDER page. Standard secure payment option is provided via PayPal. International shipment by UPS is part of the service. The hardware is manufactured in batches with limited stock. Introductory pricing starts at $1490.
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About Spectrafold Technologies
Spectrafold is a dedicated community of professionals, who work tirelessly to invent and create affordable, cutting edge SDR solutions. Together we have decades of hands-on experience delivering working solutions to the toughest missions and environments. Our customers include academic, governmental, and military organizations, but radio enthusiasts as well.
“I bought a C. Crane Witness AC Adapter to try it out on the PL-880. It is rated at 900 mA, more than enough to handle the PL-880. I think it is more than reasonable at $14.95.
I am happy to say that it works very well on the PL-880 and does not introduce any noise in any mode , even when the PL-880 is recharging the internal Battery. I also ran the PL-880 in Shortwave without the battery with no problems off of this AC Adapter. All in all, it is very well filtered, and thus quiet. I can highly recommend it for use with the PL-880.”
Update–John adds:
“I should add that the idea to use the C. Crane Witness AC Adapter for the Tecsun PL-880 came from Dave Zantow, of “Dave’s radio Receiver Page”. He had looked at the Skywave adapter, but it is rated at a maximum of 300 mA, while the PL-880 is rated at > 300 mA. Dave originally tested the Witness Adapter on the Degen DE 1128H, and was pleased with the results. Unfortunately he no longer had his PL-880 test sample, so he could not test the adapter with that radio.
He did add one cautionary note that it may be necessary to add bypass caps to the power regulators to avoid picking up low level switching hum on a whip or other indoor antenna. I did not experience any of this, but it sound like a good idea easily implemented. Dave’s review is at the bottom of this page: http://webpages.charter.net/n9ewo2/ats909x.html“
Many thanks, John! I may pick up one of these myself–would be nice to have a regulated supply for many of my radios and digital devices. (Would come in handy if I ever decide to pull the trigger on the CC Witness, too!)
On Tuesday I received the new CountyComm GP5/SSB portable shortwave radio, a sample sent me from CountyComm. If you’re familiar with the current shortwave portable landscape, then you’ll quickly note that the GP5/SSB shares a striking resemblance to both the GP5/DSP and the Tecsun PL-360. While I hadn’t anticipated writing yet another radio article before the end of the year, having just published a lengthy review of the CC Skywave, my curiosity got the best of me…and before I knew it, I’d spent a few hours listening to and making notes about the CountyComm GP5/SSB as I put it through its paces. In the end, I found I had the makings of a review.
Who is CountyComm?
Unlike most other brands I review, CountyComm has only one or two shortwave radio offerings. I wanted to know a little of the back story and motivation behind creating the GP5/SSB, so I contacted CountyComm directly and spoke with their representative, Nick.
Nick explained that CountyComm is a retail distributor of products created primarily for US government use. In a sense, CountyComm is the consumer spill-over from the thousands of products intended, for example, for state and federal agencies.
According to CountyComm, the GP5/SSB is a case in point. The company received a large order from a US government department for an “inexpensive, small portable, AM/FM/SW radio with SSB” for emergency supply caches and diplomatic posts. The GP5/DSP (a.k.a., Tecsun PL-360) fit the bill, but lacked SSB. The request was large enough that CountyComm approached SiLabs–manufacturer of the DSP chip in many of the portables on the market–and asked for help. SiLabs made some design changes and worked directly with the factory in China to produce the GP5/SSB.
The GP5/SSB comes with a medium wave bar antenna, carry pouch, stereo ear buds, wire antenna and manual.
Besides SSB, another interesting design CountyComm implemented was extending the upper frequency range of the GP5/SSB to 29,999 kHz; previous and similar Tecsun models only had an upper limit of 21,950 kHz.
You may note that as of today, there are no similar Tecsun portables on the market–this is because the first batch of units were designed for (and all purchased by) CountyComm. However, I have already heard rumblings that there will soon be a Tecsun PL-365 on the market–if so, no doubt it will turn out to be the GP5/SSB.
First impressions
Appearance-wise, the GP5/SSB is nearly identical to its predecessor, the GP5/DSP or Tecsun PL-360. The vertical form factor is rather unique in the ultra-portable world, this radio is designed for one-handed operation, much like a handy-talky. The volume and tuning controls are on the right side of the radio and are designed to be operated by thumb (for right-handed operators, at any rate). All of the buttons on the front face are easily operated by your thumb–they’re small, but have a firm response. The GP5/DSP (like its predecessor) lacks a back stand, but does have a belt clip.
The small internal speaker produces clear audio, but sounds a little tinny; there is not even a hint of bass. Via headphones, the audio quality is far better.
Besides a slight modification to the keypad layout to accommodate the new addition of SSB and a bright green antenna tip, the radio is identical to the GP5/DSP and Tecsun PL-360.
FM Performance
The CountyComm GP5/SSB, like many other SiLabs-based receivers we review, has excellent FM sensitivity.
Medium Wave (AM broadcast band) Performance
The MW bar antenna increases performance–if using headphones, you will need a right angle connector to allow the MW antenna to rotate 360 degrees
While I have not yet had the opportunity to do a proper comp recording session with the CountyComm GP5/SSB versus comparable radios, I plan to do so in the near future…stay tuned for that, right here! I’ll create a post to give you a heads-up when I’ve added medium wave samples to this review.
With that said, I expect the GP5/SSB performance on medium wave will be very similar to that of the GP5/DSP and Tecsun PL-360. I like the included rotatable ferrite bar antenna that plugs into an external antenna port on top of the radio. It certainly helps with both overall sensitivity as well as nullifying unwanted signals.
Shortwave performance
I’ve had a couple of opportunities to compare the GP5/SSB with other portables on the shortwave bands; embedded audio samples follow of a strong station, a weaker station, and even an SSB sample. Note that all of the sample recordings were taken during poor band conditions–QSB (fading) is pronounced.
Single-sideband
Of course, when I received the GP5/SSB, the first thing I did was tune the ham radio bands in SSB mode.
Nick, the CountyComm rep in charge of the GP5/SSB design, is an amateur radio operator, and I’m pleased that he represented the importance of a truly functional SSB mode on this radio.
The GP5/DSP only has 1 kHz tuning steps: more than adequate for broadcast listening, but too coarse for SSB. Amateur radio operators do not necessarily transmit right on a frequency; they’re often slightly off-frequency, either accidentally or intentionally. And older ham radios are also prone to drifting until the rigs have properly warmed up. Radios with SSB need finer-tuning controls to hone in on SSB signals. But the GP5/SSB has a work-around for this.
The GP5/SSB accommodates SSB by allowing the listener to select either the upper or lower sideband, then use the BFO function to help fine tune and zero-beat a signal.
Specifically, here’s how to tune to an SSB (phone) amateur radio signal with the GP5/SSB:
Turn on either the upper or lower sideband, depending on the meter band (generally, 40 meters and below are lower; all else, upper).
When you hear a signal, use the 1 kHz tuning increments to find where it’s strongest.
Now, press the BFO button once to activate BFO tuning; the U or L (indicating upper or lower) will begin to blink.
While the sideband indicator is blinking, use the tuning wheel to adjust the BFO. Adjust tuning until the voices in the signal sound natural.
Once you’ve done this a couple of times, the process becomes second nature.
Overall, I’m very pleased with the SSB functionality and performance. While I prefer either very fine tuning increments, or a separate BFO knob (no room for that on this tiny radio), I appreciate that CountyComm has used the BFO function to eliminate the need for a separate tuning wheel.
Audio samples
While there are a number of portable radios with SSB on the market, there are very few in this $80 price range with SSB. Indeed, to my knowledge there are no other SSB-capable portables currently on the market that are as compact as the CountyComm GP5/SSB.
Below, you can hear two representative audio samples of how each radio receives an SSB conversation between two ham radio operators on the 20 meter band. I like this sample because one of the operators has a very strong signal, while the other is much weaker:
You may notice that the GP5/SSB has a slightly higher noise floor and DSP artifacts while listening to the weaker signal. The PL-600 sounds a little muffled in comparison.
I listened to many SSB signals that afternoon on the 20 and 40 meter ham radio bands. At length I concluded that I prefer the PL-600 for weak-signal listening. The PL-600’s AGC could cope with the QSB better than the GP5/SSB.
With the majority of the SSB signals, however, I found that the GP5/SSB’s audio was clearer and voices seemed to “pop” out better than on the PL-600.
I should note that I also attempted to include the Grundig G6 in this comparison, but the G6 somehow picked up noise from my digital recorder, thus making the recorded audio sound worse than it actually was. To my ear, the Grundig G6’s SSB reception was very similar to that of the CountyComm GP5/SSB–the G6 perhaps has a veryslight edge in terms of weak-signal reception.
This morning I also had an opportunity to record Radio Australia on 12,065 kHz. This time, I had the Tecsun PL-310ET handy, so I used it for comparison:
As you probably hear in these examples, the GP5/SSB has fine sensitivity, though not quite as good as the PL-310ET.
I’ve also noted good selectivity during casual broadcast listening with the GP5/SSB.
However, I do not like the GP5/SSB’s AGC (auto gain control) as well as that of the other portables in this comparison–it’s a little too reactive to fading on the broadcast bands. To be fair, these audio samples really accentuated the AGC on the GP5/SSB since all were made during poor reception conditions and pronounced fading.
Under normal conditions, I believe I would be quite pleased with the GP5/SSB; it’s otherwise on par with most of the other ultra-portables on the market.
Summary
Every radio has pros and cons, and I jot down my reactions as I evaluate a new radio so as not to forget any details. The following is my list:
Pros:
Audio well-tailored for AM broadcast listening–fidelity quite good via headphones
Adequate sensitivity and selectivity
Clear, simple LCD back-lit display
SSB mode is quite functional
BFO feature allows for zero-beat tuning
Includes both upper and lower sideband selection
Much like the PL-880, when in SSB mode, the GP5/SSB will select ham bands when changing meter bands
Extended frequency range (up to 29,999 kHz)
Very good medium wave reception with supplied external bar antenna
Uses three standard AA batteries
Can be charged with common mini USB adapter
Displays temperature in Fahrenheit (if MW set to 10kHz steps) or Celcius (if set to 9 kHz steps)
Great radio for an emergency kit or bug-out bag
Designed for one-hand operation/included belt clip (see con)
US Warranty
Cons:
AGC doesn’t cope with fading as well as other comparable portables
Audio from internal speaker rather tinny (without headphones)
No back stand, nor rotatable whip antenna; thus this radio is not ideal for tabletop listening (see pro)
If you’re looking for an ultra-portable radio for travel and general broadcast listening, I would encourage you to consider the new C. Crane CC Skywave, the Tecsun PL-310ET or the Tecsun PL-380. Overall, the performance and form factor of these radios are a better fit for broadcast listening. If you’re looking for armchair SSB listening, a larger portable with a larger internal speaker such as the Tecsun PL-600 is a good choice for the same price as the GP5/SSB.
If you’re looking for an ultra-portable radio with SSB, then the GP5/SSB is a very good choice (if not the only ultra-portable SSB choice currently on the market). While the SSB performance can’t compare with larger, pricier receivers and ham radio transceivers, it’s very good for $80 US.
If you’re looking for an emergency communications receiver–something to stash in your vehicle, emergency kit or bug-out bag–the CountyComm GP5/SSB is a great choice and value. Indeed, that’s who the GP5/SSB was designed for; that’s why this rig has excellent frequency coverage in all modes, with good sensitivity/selectivity and designed for portable, one-hand operation. In fact, CountyComm has even designed and manufactured (in the USA!) a robust, protective 1000-Denier case for the GP5/SSB. This case makes it very easy to strap the GP5/SSB to your belt or backpack securely.
In conclusion, the CountyComm GP5/SSB was designed for a specific purpose: to be an emergency communications receiver. It does this job quite well, despite any shortcomings in comparison to other popular shortwave portables, and for this purpose, I can recommend it.
I received my copy of the 2015 World Radio and TV Handbook (WRTH) directly from the publisher last week. As many SWLing Post readers know, I always look forward to receiving this staple radio reference guide each year. While other reference guides have dropped out of the scene, WRTH has remained strong and the publication’s quality has been wonderfully consistent. In fact, I noticed in the Editorial that this is 69th edition of WRTH: obviously, a publication with longevity.
WRTH’s team of noted DXers from around the world curate frequencies and broadcaster information by region; while I’m not sure how they orchestrate all of this, the end result is truly a symphony of radio information. In addition to broadcaster listings, WRTH’s radio reviews, feature articles, and annual HF report make for excellent reading.
But the WRTH isn’t just a frequency guide: the publication always devotes the first sixty or so pages to articles relating to various aspects of the radio hobby. Following, I offer a quick overview of these.
The first article always features a WRTH contributor (indeed, it’s this very network of contributors that make WRTH and its listings such a success): this year, Mauno Ritola tells us how he got interested in the hobby and what being a contributor means to him. Many of you will recognize Mauno’s name–he’s quite a prominent Finish SW and MW DXer (and a very nice fellow, as well).
The second set of articles is always my favorite: WRTH receiver reviews.
This year, WRTH reviewed the CommRadio CR-1a (un update of their very positive CR-1 review last year). They also review the Tecsun PL-600(above), the SDRplay software defined radio, the MFJ-1046 Preselector, and the Apache ANAN-10. The 2015 WRTH also has a special review section that features two HF noise and loop antennas: the AOR LA400 indoor loop and the Wellbrook ALA 1530S+ Imperium Loop (which wins the WRTH Award for Best Antenna). As I’ve come to expect from this publication, these are all great comprehensive reviews.
The SDRplay
The following article is “Wooferton: 70 Years on the Air,” written by Dave Porter, one time Senior Transmitter Engineer at the site. In a few pages, you’ll gather the technological history of the site, dating back to a rather bumpy start in WWII.
Following this, noted DXer and WRTH contributor, Max van Arhem, speaks to The Future of DXing. He proposes that with the decline of international broadcasting on the shortwaves, there is still much challenge in the hobby–especially by broadening DXing in the FM and medium wave bands. [Indeed, I’ve certainly seen an increase of questions about medium wave DXing here on the SWLing Post. I hope to cover more of these topics in 2015.]
Lord Howe Island
WRTH often features a snapshot of the radio scene in various parts of the world. This year, WRTH Contributor, David Foster, writes about his recent trip to remote Lord Howe Island and what he discovered about the radio landscape there. As a keen traveler myself, I found his article fascinating (Lord Howe Island is now on my travel list!).
As a bonus, WRTH includes a feature/review of the benchmark Watkins-Johnson 8711A receiver. Not only does the article speak to the mechanics and virtues of the 8711A, but it also places this particular model within the context of the Watkins-Johnson legacy.
The final sections of articles are dedicated to the WRTH Digital Update and HF propagation report/forecast.
As expected, this is another great edition of the World Radio TV Handbook. As I’ve said many times, though I use online frequency databases fairly regularly, there is just no replacement for a good printed frequency guide–especially for all of my off-grid DXing.
For DXers who collect QSL cards, you’ll find that broadcaster contact information in WRTH is often more up-to-date than a broadcaster’s own website.
Not only does WRTH contain more in-depth information on broadcasters and schedules, but it makes for quick reference, and doesn’t require a computer or Internet connection–much like, well, your shortwave radio.
Many thanks to SWLing Post reader, Mike, who notes that Amazon.com is now shipping the Eton Satellit with a potential arrival date of before Christmas (at least, as of today). Current price is $179.72.
Dr. Bertalan Eged of Spectrafold Technologies recently contacted me regarding a new military grade SDR they’ve produced: the Quadrus SDR. Today is the Quadrus official release.
