Followup on my post about a week ago. After a nut fell off inside the K1, I lost the sidetone and the selectivity seemed to be on #3 (most selective). I'm receiving signals on the air just fine, so it's clearly a sidetone/audio problem, and not an RF problem. I can set the power level just fine, so OUTB on the D/A U2 is working fine.
I ordered a new MAX518 (U2 on FP) D/A from Elecraft and installed it. No problems are visible. And I still have no sidetone. I put a 'scope on U2 OUTA and when keying slowly (set to 8 wpm) I see a signal, but the scope will not trigger on it (on timebase 0.2 ms/div, and a 1 kHz test signal is clean). The same messy signal appears on the AF Amp IN2 (pin 2) on RF board. I can see the bars on the LCD, so I am pretty sure the transmitter is keying just fine, and I can hear a clean signal on an adjacent receiver. Unrelated (to my sidetone problem): just below AF Preamp/Mute on the diagram I see to pins marked AF2 and AF1. Are these points connected? It looks to me like the audio signal has to pass through between these points, but I don't see where they are located. Any insight into this is greatly appreciated, David ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
