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Guys I have a D201A I believe is the late model from the extra trimmers on the bottom?
im having a few issues.
1) meter pins far left all the time. I replaced V401 & V602 from a working D201A but still the same issue.
2) When radio is just sitting monitoring I hear the normal static on channels...
Yes I do have VR7, I am picking up a blown up schematic today so I can take a better look at what’s going on I can’t stand looking at a schematic on my iPad.
I did take a few voltage and frequency readings and all I can say is someone definitely took the turn before you understand rule. It...
Well, I did find different alignment procedures that do make more sense than the manuals.
PLL Synthesizer / Oscillator Frequency Alignment:
1. PLL2 - VCO Voltage:
A. Set radio to 24.890 MHz, AM RX mode, connect multimeter to TP10.
Adjust L14 for 1.0 Vdc ± 0.1.
B. Set frequency to 29.699...
The reason I brought this up is the fact I’m seeing a carrier on LSB & USB unmodulated. So If I’m reading and seeing things properly “L18” is the culprit most likely.
Seeing that the Alignment procedure is not that informative what’s the best approach for setting L18? I don’t want to just Willy...
I am looking at the alignment procedure I attached.
and have a few questions. I’m only checking and not making any adjustments at this time till I can clarify a few procedures.
6.1.1 PLL Alignment
1) USB & LSB OSC Set radio to USB TX mode. Mod off. Connect Frequency Counter to TP5 (is an...
OK this is a strange one, let’s start with it is a bit off frequency on SSB but spot on in AM & FM that’s not the weird issue.
when the radio is cold and keyed up at say 10 watts AM I not see a frequency read out on an external counter or scope but when I turn up power to say 30 watts it starts...
So I removed the channel mod and Roger beep, good news is radio works kind of.
Not So good news:
1) voice locks centered no modulation.
2) Frequency Counter and Oscilloscope
3) Dummy load and watt meter.
1) CH1 RX radio frequency counter 26.9654, TX 26.9462
2) CH40 RX radio...
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