Re: Adding CW support for QDX?
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Hi? Zhenxing Han
Thanks for the suggestion?
This is also something I have been thinking of and is on my list to investigate.?
The first priority though is to find appropriate parts (performance, availability and price) to make a third batch of QDX.?
73 Hans G0UPL http://qrp-labs.com
-------- Original message -------- From: spica.han@... Date: Tue, Dec 21, 2021, 11:26 AM To: [email protected]Subject: [QRPLabs] Adding CW support for QDX? Hopefully Hans can see this. We know QDX is designed as a transceiver driven by a computer to work. So it means you always have a computer available along with QDX. Now if you feel like CWing as well, you need another QRP transceiver (QCX*, KX2/3, IC-705 etc) which means one more device to carry and switching antenna back and forth while switching between FT8 and CW.
I'm wondering does it make sense to add the same key-shaping circuit in QCX to QDX so it can support transmitting CW as well? That would essentially turn QDX into a QRP version of FlexRadio (although CW/Digital only and operated locally). With a single USB cable carrying I/Q, tone and CAT, the computer becomes a panadapter and SDR. Since QDX has a high performance ADC, I think DSP software in computer would make it a high performance CW receiver. On TX side, we can either use logger software's built-in keyer or paddle/key with WinKeyer to control QDX via CAT/PTT.
I currently have a KX2 with I/Q output mod. To achieve the equivalent of the FT8 + CW + Panadapter setup, I would need a HiFi USB sound card (larger than QDX), another USB cable for CAT, and 2 more cables carrying the analog I/Q signal and tone signal. While with QDX, only one USB cable is needed. So I kinda feel this QDX+CW is a neat solution. Any comments?
Zhenxing Han/KN6PZO
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