Bob, The polyphase headers are marked 0° 90°.180, 270 which come from the outputs of IC3,4 which are marked 0° 90°..... Amplification is on the polyphase board. 73 Alan G4ZFQ

The receiver manual says the following: 5. Optional Polyphase network module "...This is because the audio transformer TR1 is fed by the output of the polyphase network module, NOT by IC5. In fact

I'm sure I missed that too. I'll have a look, thanks

Okay.. Got it! Perfect. Looks like the GPS unit dosent need to be plugged in constantly as well. I'll give it a shot! Barry

Hi Barry, I just posted about this yesterday because I had the same problem. The GPS shares the same port as one of the keying lines. You have to turn WSPR on and THEN plug the GPS in. When you switch

Graham, I was going to reply to Daniel saying that this is getting more a series of speculations rather than a discussion. Certainly decoding could be considered imperfect, bad decodes of marginal

Using QCX on 30 Metres Firmware T1.00c Hello, I have seen some reference to this in the group messages but I can't seem to find an solution. I really enjoy the WSPR mode but when I connect my QLG1

I'd start by thanking Hans et al for designing, kitting and supporting such a gem! It's certainly the most surprising kit I've ever built. Instructions are so good it took me a total of four hours

Good morning Alan (and all), Agreed with all you said. This discussion has gotten me wondering just how the WSPR does determine the reported figure for DRIFT and SNR. There are documents with the

Al, unfortunately, decoders only work well with clean, clear, well-sent code. Normal HF things like QRN, QRM, QSB, weak signals, bad fists, etc., limit their accuracy. A little tweaking may help, but

Hi, This discussion seems to have branched in two different directions. One is drift and the other is absolute frequency. Please tell me if I'm way off on this, speculations follow: From WRPS

Now that I've go my 40m QCX operational now comes the hard part of overcoming my aversion to learning code again. I was never quite good at it and mostly learned to to get my license, oh, maybe 40

Hans, In hindsight (a) that's probably in the manual and I missed it and (b) since it was keying in time with the GPS 1pps pulse I should have realized that (and read the manual). I am very happy

Thanks for the detailed reply Hans (1) You can order any blank ATmega328 or ATmega328P and program them with the hex files, for all QRP Labs projects except QCX. On the QCX you can only upgrade an

Hi Chris, I only get myself in a bind when I power up outside of the case and thankfully, even then, I typically use a Tektronix 2343 PS set to the appropriate voltage and current limit. Every now and

Hi Michael, The audio problem you have is exactly what I experienced and when I eventually traced the problem it was the audio socket, intermittent at first giving terrible audio but it worked to

Graham, OK:-) But as you say only these specialised programs have compensation. I think this is either for when the card crystal is used as a frequency counter reference or in order to allow for

Hi Dave That's really strange. I cannot see what could generate 7.5MHz on the processor's TX pin. The processor could not generate a signal at that frequency. Sorry if this is a dumb comment, but are

Hi Michael The GPS signals are shared with the paddle. So when not in Beacon mode (6.1 Beacon = ON), and when not doing crystal calibration, the GPS should be disconnected. Regarding WSPR callsigns,

Hi Michael You can order any blank ATmega328 or ATmega328P and program them with the hex files, for all QRP Labs projects except QCX. On the QCX you can only upgrade an existing original chip, this