My K1-4 was working well when I first built it. Now I'm having some problems on 20m and maybe also 15m. Here is what it is doing:
40m and 30m: receives well and transmits 7 watts as calculated with voltage measurements on the DL1 dummy load. 20m : no reception and no signal heard from the XG2 signal generator; no voltage measurable on the DL1 dummy load indicating no power out 15m: no reception (I don't have a signal generator to test on 15m); no voltage measurable on output, but I can receive a signal from the K1 on my general coverage receiver. What I've done so far: 1. checked that the filter board crystals are oscillating by putting my general coverage receiver antenna near the crystals and tuned to the crystal frequency RF probe measurements: 2. VFO U7 pin 4/5: 40m: 0.064v; 30m: 0.034v; 20m: 0.034v; 15m: 0.132v 3. Pre-mix bandpass filter FIL-P1 pin 6: 40m: 0.081v; 30m: 0.046v; 20m: 0.000v; 15m: 0.024v 4. Transmit PRE (out set at 3.0W; but drops to 0.1W in tune mode on 20m and 15m) 40m: 0.080v; 30m: 0.057v; 20m: 0.001v; 15m: 0.29v The only test equipment I have is multimeter, an RF probe, an XG2 signal generator, and a general coverage receiver. Any suggestions for what I should look at ? 73, John, W8DE -- View this message in context: http://elecraft.365791.n2.nabble.com/K1-stopped-working-on-15m-and-20m-tp7580120.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
