#resolved Thanks Jim. I found the volume control potentiometer was bad--wiper not connected internally. Not exactly what you were thinking, but thanks to your clue the pot resistance was the first thi

#qcx40 #problem

Hi, John Section 6 of the manual deals with trouble-shooting. Starts at page 126 in the original manual. One thing to check, before getting too deep, is the resistance from the volume control wiper to

#qcx40 #problem

Did you update to the latest firmware 1.02? If so what is your side tone set at ( Menu 4.8) Try 750.

#qcx40 #problem

QCX Enthusiasts, My QCX 40m suddenly stopped producing audio... Front panel display is OK. There is no sound from the antenna. There is no side tone. Keying the paddle produces clicks--one click for e

#qcx40 #problem

Derek, I have repaired a few QCX units for fellow hams. No charge, just part of the fraternity. Let me know if I can help.

#problem #qcx #rcvr

Thanks for adding me to the group! I hate to admit how little experience I have, but my purpose in coming to this group is to ask for help in fixing my QCX. And by “help” I need to ship this little wo

#problem #qcx #rcvr

I had the same problem as soon as I made an additional duplicate button for pressing the encoder.

#qcx #problem

I used cheap push button switches on my QCX and experience the same. I think mine got to hot when soldering and needed to be replaced. The same issue on the key input for the uBITX. If the contract re

#qcx #problem

Hans, Happy to send you my problematic button. Can you email an address? Thanks for being so responsive on this (and every issue!). 73, Jim G0UON

#qcx #problem

Hi Dave Nice article! All the buttons in QCX use the same firmware debounce that I developed for the original Ultimate kit, which was then re-used on all subsequent kits (Ultimate2, Ultimate3/3S, VFO,

#qcx #problem

Hans, Here is an excellent article on debouncing, by Jack Ganssle: http://www.ganssle.com/debouncing.htm He walks you through all the issues of debouncing switches in both hardware and firmware. I par

#qcx #problem

Ok Luc, Karlis So I should make some firmware change to try to more fiercely debounce your crappy buttons. If you would send me some ones that show the symptoms, I will do it. 73 Hans G0UPL http://qrp

#qcx #problem

Hans & others, Just to add some momentum ... I also had this problem, but didn't consider it too serious to report. But in my QCX20, using the internal buttons, never had any problem. In my QCX40 I us

#qcx #problem

Just checked with a scope. The buttons are very noisy, it's not the resistance or pickup. They just generate a very quick and random train of pulses for about 1ms which coupled with the ADC capacitanc

#qcx #problem

Hello Karlis It's a mystery, for sure. I don't know what could cause this problem - hardware or firmware... In all the thousands of QCX out there, a percentage of which (including mine) are using off-

#qcx #problem

And my buttons measure 0.5-1 ohm. I cannot possibly see how 1 ohm in series with 3.3k (R45) or 1k (R44) forming a voltage divider with 10k would make a difference. 5V * (3.3k / 10k) = 1.65V on the ADC

#qcx #problem

Thanks for all your replies guys. I've just measured the resistance of the button (but whilst still connected to the PCB) as ~1ohm, whereas the rotary encoder button is ~0.5ohm – a very small resistan

#qcx #problem

When one hears hoofbeats we don't think of zebras. Think horses. My first two thoughts are poor buttons, I've used them and they are terrible tot he point of removing them and finding something better

#qcx #problem

I didn't mean to imply that they could just drop a Nano into the QCX. I was simply stating the Nano as a frame of reference, since that is probably more recognizable than stating the ATMega328P. Given

#qcx #problem

Hi Jack, Karlis, QCX does NOT use a Nano, and does NOT use Arduino at all :-) No blasphemy please!! Only the processor ATmega328 is the same as some popular Arduino models. There is no other similarit

#qcx #problem