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Attiny85 chip very affordable anywhere and you can get the software from github. https://youtu.be/iYSalPFrX8k?si=kV4VxUCQ5FK1BPJ0 -- __________________________ .----------------. .----------------.

It's been mentioned many times in this group. I have a power cord with a buck converter to keep my 12V QMX fed with 11.5V. Brian n1bs wrote:

I’m surprised more people haven’t mentioned this… But if your QMX is built for 12 V you should never apply more than 12 V. If your QMX was built for 9 V you should never apply more than 9

OK! That's great news, Jason! Congrats on the repair and VY 73 OM. JZ KJ4A

Lo and behold, of course the back cover didn't fit thanks to the diode, I knew that but didn't remember when tacking it on.? So I took that off and put another on closer down at board level.? Since

John, got some ICs in and did the fix tonight.? If you wouldn't mind glancing over this and giving me some experienced feedback before I power it on again it'd be much appreciated. Masked it off

Hans Hi Using 5 Volts (you can not blow anything :) ) from an USB and no LPFs no BPFs (bypass 7805) I tested 2200m, 630m, 160m, 80m, 60m, 40m, 30m, 20m, 17m, 15m, 12m, 11m, 10m and 6m on transmit

--Ooops, the power meter was between the QMX and the Tuner Chuck, W5USJ EM22cv, Rains Co., Texas

Evan, I had Vcc at 9V this last time. I think the power with WM-2 and dummy load was about 1.2W Next I switched to antenna with tuner in adjust mode. The bridge is about 1.5:1 SWR. The failure

Thanks, Evan, I do have two dummy loads, the larger of which can handle up to 150W.? So I'll plan to build either the Salas or Hayward 40dB pickoff and follow it with a step attenuator. Eric

Further info: The QMX, like the QDX power, will change with the impedance.? I have noted an increase in power ratings for SWRs that, when I put it on a dummy load, are 1.5 watts or more lower.? This

Try using 12v rather than 13.6v. ?They are not the same for QMX purposes.

Hi Chuck, Sorry to read of your problem. I believe that the QMX has an SWR function that is at reduced power.? It might be better to use it to adjust the Z-Match.? That would give you an

Hi Eric, For best results, keep the input at the TinySA under -25DBm.? That means for 5 watts, a total of 36-(-25) = 61 DB.? An additional power attenuator of either 20 or 30 DB would be a good

Thanks. ? I am getting a QRP Kits 41dB step attenuator, recommended in this forum.? What isn't clear to me, from the tinySA Ultra specifications,

I've used variations pretty much the same Z-Match tuner for many years. Since the first NorCal BLT Wasn't trying to get more power, just reducing the reflected RF for better SWR. Supply voltage was

It would take more RF power than the radio can develop to hurt those capacitors it seems. The ESR (equivalent series resistance) is quite low. The possibility of cracked capacitors or defective

Thank you to everyone who replied, it took some time to follow up on the links and suggestions. It would have suited me well to have found a good compromise keyer kit with enclosure, a real time

It bummed me out too!!! -- Bill Harbour K4VIB

Ron, I think you are referring to the old Curtis Electro Devices 8043/8044 morse keyer chip ???If so, I have no idea where you might get one these