Hans - you may remember we were going direct on this one - may be relevant to others so posting here. Recap: "12v supply came loose and bare +ve line 'touched down' briefly at locations unknown with s

Hi Alan Tks for suggestions will take some measurements over weekend time permitting. Yes the power lead care has been implemented but still not got current limiting on shack power supply (ouch!) I wo

Hi Alan Finally got some time for this. Current status: Only button command working is 2 presses of S2 which brings up RIT screen and stops the audio buzzing on transmit. S2 & IC2 P 26 are at 3.7 v. I

Hi Alan Finally found time to take another look after your suggestions. The "buttons" section in troubleshooting refers specifically to board version 1/2. Mine is version 4 Current status: Only button

Hi Alan Tks for feedback. Have attached an Excel sheet with all of my latest readings (DVM). Let me know if more needed. Can't see any problems around the processor & C47. Yes, I struggled a bit with

Hi Alan No typo ~0 is what I'm reading. However, just checked on my QCX 20 in RX mode - IC2 Pin 27/LCD Pin4 are at zero. If I select alignment mode 8.7 and bring up the tone I get 4.85v and this is ma

Hi Alan Can you resend ur earlier msg with the revised voltage list? Deleted in error Tks Mike

Hi Alan Looks like we are nearing the dump bin. However, have done another check for mis-soldering, bridges and broken components - nothing spotted. As the processor functions to some degree and has w

Hi paddle key specialists/builders. Hope this is not too far off-topic but hoping one of you can help me with a repair of my old G4ZLP key so that I can start using my newly completed QCX 20. I disman

Thanks for the suggestion Niels. That was one source of springs I hadn't thought of. Those that I've checked so far are either wrong ID for the 3mm screw or wound in wrong "sense" . Continuing to look

Hi Eric Thanks for the tips. Never thought of taking the DIY to the next level - shame on me! Now I need to find a local source of piano wire (in 9V/9M) Thanks again Mike

Thanks Martin Next time I'm in the area I'll take a look if still in need. Found almost matching item today in Handyman Centre (Lucky Plaza) but very tight fit on the M3. It'll be a struggle but may w

Hi All Thanks for the various suggestions. Got to the DIY shop Friday and had a frustrating time sorting through their large collection of assorted springs (probably 95 percent wrong "sense") - just a

Hi Alan Thanks for the guidance on the processor upgrading. I used a $3 USB asp from China, W10 and in-situ QCX. Just had to adjust the clock speed slightly and then all three processors upgraded to 1

Hi All Due to a problem with my keyboard skills (I'm sure it isn't a sinister marketing ploy ..... joke!) - both times I have ordered a QCX kit I have received two. No problem - I thoroughly enjoy the

My one & only DVM is from Cirkit, sounds similar to what Hans has. Probably more than 30 years old & has done all I need since breaking my even older Taylor 127 (analogue) from 1962! Have same problem

Just to adding my experiences with QCX20/low power - & some help still needed. I had a spare QCX 30 kit with V4 board which I have now built up for 20m using latest updates i.e. R41/42 150R and 1.2K,

Hi Allison Does the tuning of L4 have possible relevance to the key shaping &/or instability I am seeing! I guess power out is easily appreciated (if not easily measured precisely) thus the obsessions

I had similar experience with intermittent low power after taking one too many turns off L3. 2 turns removed total current jumped from 450 to 900 mA on key down & finals too hot to touch! Put the turn

#20m #qcx

Hi Rob No - have not done any more on key shaping. I was hoping for more feedback from the group as don't fully understand the circuit. I would have thought (wrongly?) that malfunction in Q4/6 would r

#20m #qcx