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Hi Dave I have not tried this mode. Do you have a list of all the recommended QRSS frequencies and speeds or a link to them please. I might try reprogramming my multiband U3S if I have the

Hi Bob Fixed! 73 Hans G0UPL http://qrp-labs.com

Hi All, I mounted the board in a case I picked up at a fleamarket and have been enjoying listening to the QCX this weekend.? (some kind of Italian CW contest this weekend...)? I am really impressed

Arv This is not correct. The AVcc pin provides power to the internal analogue voltage circuits in the ATmega328. The QCX uses the ATmega328 ADC with the reference set to the supply voltage (AVcc).

Hi -? I have a 20 meter kit and I started the alignment procedure and I noticed that I can peak 8.7 by adjusting the capacitor C1 but then when I try adjusting R27, R24 and R17 I am always at the

Hi Glen, I get the feeling that T1 is fairly tolerant. I've done 4, 4, 4, 31 windings instead of 3, 3, 3, 30 -- in a guestimate attempt to make the RX work on both 20m and 30m (but I cannot check

GM Barry, I've 30m QCX without that problem. I built mine with T1 a little different 3, 3, 3, 31 windings instead of 4, 4, 4, 30 windings, but the audio range is fine and sensitivity on a par with

Thanks for the info Dave ... as you say, not so cheap. So far the ECS TCXO on BB01 has been OK ... I can see some 'steps' occasionally, but the WSPR and JT9 still seems to decode.

oops, I just tested something here locally and screwed up the tracking map. Perhaps Hans can fix that? Looks like BB01 got hit with ice loading(?) yesterday. There was a sharp

Dave, I'll give it a try!? Am I correct, each symbol is 6 seconds? Sorry, this is all very new to me! ATM, the message line I use for a CW ID at the end of my WSPR transmission and my message line

Hi Glenn, T1 is in the Rx chain only, so the TX will not be affected at all. Fewer turns on T1 will not be ideal for the RX, but won't stop it from 'working'. They are not tuned,

Just found out by reading QCX mail that I have wound the three small winding's on T1 with only 3 turns instead of 5 per the instructions! However rig is putting out 4 watts and receiver is great! WHY?

Just in case anyone stumbles over this.? I recently had to replace the QCX Atmega chip; this after bricking the original.? I've since learned how to update the chips properly. Initially I thought

Keith... I sure apologize for taking this long to respond.? After you mentioned Earl's web page, I had a look and simply sent him a note.? He had the parts to me in jig time!? In fact I recently

Not sure why they picked the 20M version. I plan to use the 20M in the trailer when we are camping (often). We spent a week on Salt Spring this summer and enjoyed it so much we will be back again this

AVCC should be very close to the Vcc supply voltage. If that is at 4.6 then either your Vcc is at 4.6 or something is dragging AVCC down. Normally this pin is unconnected, but if you want best

Thanks Alvey, this is very useful info. I was also thinking abt the "preselector" for the front-end ;) glad to learn from Hans that he is willing to modify the software :)

I get the point Hans and makes sense. But... tinkerers always pushing the envelope :) I was considering 17 and 20 taking into account the monoband ethos of the QCX because these bands are close. What

73 Ondrej OM4DW

Problem with encoder - try to check voltage at pin AVCC of ATmega. It should be close to 5V. After "Unreliable microcontroller start-up" modification, I had only 4,6V on AVCC that caused bad decoding