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Hans, Alan, Thanks for your comments. Hans - yes I had done the PA instability mod and just checked it. I've measured p-p voltages with a scope at various points within the LPF with 15 second key

Thank you Hans! Your web page is very much appreciated. I'm pretty sure others will find it useful. One suggestion for an eventual rev6 for the relay board: Provide another set of jumpers so one can

Hi Jan, Yes, I? don't find BFO parameter in WSJT-X :( Other idea will be to use some other software to shift audio signal from QCX filter (~ 500-700Hz) to WSJT-X bandpass (1400 -1600Hz). Spectrum Lab

Hello Mike, Mine arrived today, the insulation is not enamel, so I rang them, it's NOT suitable for electronic usage, it's coated copper to take an anodized top colour, so no good for winding coils.

What do you see on the second line of the display for sat info, particularly the "F" number?

Users of Hans' U3s, si5351 synthesizer etc may find this interesting, particularly those who might be interested in disciplining these devices to GPSDO or other high precision reference having only a

key problem:?https://www.youtube.com/watch?v=ZIkhzYy2O3Q Hans, what do you think about this?

I am having a really dumb moment, or week, possibly year. I have built a QLG-1 and the Shack Clock kit. I appear to have them working but not together. The QLG-1 by LED indicators appears to be doing

Hi Euan Have you implemented the PA instability modification: http://qrp-labs.com/qcx/qcxmods.html#pa ? If not then please give it a try, this may cure your issue. 73 Hans G0UPL http://qrp-labs.com

Hi Al The behaviour is normal but annoying... I already have it on my wish-list for the firmware development. 73 Hans G0UPL http://qrp-labs.com

Still on the list, Jack, yes... 73 Hans G0UPL http://qrp-labs.com

Hi Colin Please see http://qrp-labs.com/ultimatelpf.html , I have just added this information to the page. 73 Hans G0UPL http://qrp-labs.com rotbaron77@...> wrote:

Hello gang, Continuing my quest to complete the multi-band 5W Tx/Rx project, I just got my latest batch of kits in the mail. Included was the Relay Board revision 5 which now has as "normal" the

I changed the circuit and program to support switched lowpass filters.? The program is written to support 3 filters.? I uploaded another circuit diagram.? The new circuit could also be used without

Hi Glen, Any thing is possible. Taking a clue from your subject field. It will not prevent Transmit function though. There are no Transmit / Receive relays or PIN Diode switching in this design. Look

Could Q5 be open? Can I jumper Q5 to see if I can hear a signal without further damage? Glen N8WE

Hans I have fitted stereo jacks to the keys and they do work in the stereo socket. I confirm that?the green wire was cut internally in the Palm Radio PPK straight key to avoid shorting between ring

I've been running my 40m QCX on WSPR for the past few days and thought I'd comment on the start-up behavior I'm getting with my QLG1 GPS module. My QLG1 when it's first powered up can take about 30-40

a while ago someone asked how others were connecting the GPS unit to the QCX. I have just done mine and it seems to work just fine. I bought two TRRS jacks and a TRSS to TRSS cable from Amazon. (The

Euan, You may like to read Hans' guess at the reason. /g/QRPLabs/message/17690 It would be interesting to see if he is actually correct, removing turns to make the LPF more efficient.