Greetings, To recap, I have a bar or so of S meter, regardless of band, and the cw signals are there, but not loud, crisp and prominent as on my K1 tuned to the same freq. I built the crystal oscillator for signal tracing with a 30 meter crystal, and it is powered by 12v.
Things seem to go wrong kinda where I expected, in the mixer, i.f. amp and crystal filter. Here are my findings. Appendix E Troubleshooting, Page 10 PLL Reference Oscillator and VCO Step 2: Reference oscillator output. Expected: .8-1.8, Actual: 1.155 Step 3: VCO output. Expected: .3-.4 Actual: .342 Step 4: VCO Buffer Output: Expected: .6-.75 Actual: .646 BFO (Page 11) BFO Output. Expected .2-.7 Actual: .625 BFO Buffer Output. Expected .025-.070 Actual: .046 Low pass filter, bandpass filterand T-R switch Step 9: Low-pass filter output. Expected: .13 Actual: .12 Step 10: T-R switch #1 output. Expected: .093 Actual: .086 Step 11: Band pass filter output. Expected: .086 Actual: .079 Step 12: T-R swtich #2 output. Expected: .077 Actual: .066 Mixer, I.F. amplifiers and crystal filter ****** I am assuming that the next two tests were done no ATTEN and no PRE selected ****** Step 1: Attenuator off test. Expected: .077 Actual: .067 Step 2: Preamp off test. Expected: .077 Actual: .066 Step 3: Composite Mixer output. Expected: .079 Actual: .059 ***** Here is where things start to go bad. ******* Step 4: Post mixer amp output. Expected: 2.20 Actual: 3.956 Step 5: -5 dB pad output. Expected: 1.4 Actual: 3.983 Step 6: Crystal filter output. Expected: .35 Actual: .128 Step 7: T7 Step up ratio. Expected: .4-.8 Actual: .46 Step 8: I.F. amp saturated output: I measured 0v, I could not get .15 by cranking up the signal generator. At this point I stopped as prior results need to be fixed before pressing on. During the build, I grabbed Q12, 2N7000, and soldered it elsewhere by mistake. I removed it and resoldered it correctly when I discovered my mistake, no power had been applied with the component in the incorrect spot. Maybe I blew it up??? Below are DC readings from page 17, RF board. Q12 Source. Expected: 0 Actual: .114 Q12 Gate. Expected: 6 Actual: 6.05 Q12 Drain. Expected: 0 Actual: 0 Q22 Emitter. Expected: 1.3 Actual: 1.2 Q22 Base. Expected: 2.0 Actual: 1.9 Q22 Collector. Expected: 12.5 Actual: 11.19 U12, all voltages were very close, expected 7.9 was 7.75 The rig was supplied with 12.33 (gel cell) Sorry aobut the long message, but will appreciate any thoughts. And or prayers. 72/73 Bob, AD7BP "You are boldly going where no man knows what he is doing" -Maarten Schmidt, Palomar astronomer- ______________________________________________________________ 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
