![qrp-labs cw decoder qrp-labs cw decoder](https://qrper.com/wp-content/uploads/2020/11/QRP-Labs-QCX-Mini.jpg)
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Rather than a comparator for zero crossing detection, I have the precise numeric values straight from WSJT-X via the noise-free, lossless digital transfer of the USB Audio interface. QDX implements the concept differently because it has the built-in USB sound-card emulation which is known to be running at 48kHz sample rate. It's a neat solution that fixed the problems in the transmit side, at least, of their transceiver. Then add that to the FT8 "USB dial" frequency to get the RF frequency, and command the Si5351A to make it so. They use the ATmega328's analog comparator on the incoming audio and "time" a cycle using the timer input capture register, clocking the time with the system clock which is 16MHz. "What they (QRP Guys) call AFP-FSK is the same concept though implemented differently. Price with aluminum/aluminium case is $80.
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The QDX can be built to operate at full output with either a 9V or 12V input. Power output is variable (in my case, from 750mW to 5 watts), based on input DC voltage.
![qrp-labs cw decoder qrp-labs cw decoder](https://i1.wp.com/www.pbase.com/daverichards/image/167049273/original.jpg)
And nothing compares to a G0UPL-written manual. What makes the QDX unique, even compared to the AFP-FSK, is its onboard soundcard for USB connectivity of both audio and CAT, 5-band operation (20, 30, 40, 60, 80 meters), tiny size and no alignment.
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Hans is hoping to be able to offer 375 more of them next month and is already making changes to the board to do away with a mod necessary on the Rev1 kits. The price is $80 with 3 filter boards, no case included (or available).įinally, the hard-to-obtain QDX.
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Output power is 4-5 watts, depending on band, and audio is routed to/from the PC with two standard audio cables. Plug-in filters define the band in use, with three included in the kit - for 20, 30 and 40 meters.įour additional filter boards, minus the components, can be bought for $10. The AFP-FSK can operate on any band, 10-160 meters. The QRP Guys explain it in text here and QRP Labs does so in a video here (beginning at 2:10).Īlthough the two kits share that unique feature, there are some significant differences between them.
![qrp-labs cw decoder qrp-labs cw decoder](https://www.qrpworks.com/uploads/1/0/4/6/104671551/skx-front-oblique-2_orig.jpg)
The new AFP-FSK from QRPGuys and the new QDX from QRP Labs both use a novel method of frequency generation.
#Qrp labs cw decoder manual
I am unable to find a manual for either of these kits without being a member of the relevant Group.io.Īnd with the next two kits we step into a different league: Output is 1 watt, price with housing is $59. The price, with aluminum housing - $35.ĬR Kits also makes a new 13TR kit (pictured, and same website as above) for 40m FT8 - this time using SSB. The D4D is a monobander for 20, 40 or 80 meters and output power is 1 watt.Īudio cables to/from PC and VOX keying. This kit uses double-sideband modulation and therefore produces as much QRM as usable signal. Price with a case made from circuit-board material was $80.Īrriving about the same time as the Phaser, and still available, unfortunately, is the D4D from CR Kits. VOX keying took the place of CAT and a single-step alignment procedure was required for frequency calibration. Power output was ~4 watts and audio cables were required to/from the PC.
![qrp-labs cw decoder qrp-labs cw decoder](https://www.dxzone.com/dx33365/5w-cw-transceiver-from-qrp-labs.jpg)
Each kit would operate on either of two discreet frequencies to allow FT8 and (usually) JS8. Later versions made 10 and 15 meters available. Phasers were (they are no longer available) monobanders, available initially for your band of choice, 17 to 160 meters. I built one for 20m, converted it to 60m and had a lot of fun with it. It all started with the Phaser, and it was stunning. It's amazing to see the innovation of design that has occurred, in such a very short time, in the four kits described here. The technology behind WSJT modes & JS8, and the evolution of various kits that take advantage of them, is something I find very interesting.