I'm experiencing low power out (on K2 front panel anyway) when using a
transverter connected to the XV60/Transverter Adapter.
When set to P .5 (1/2 mw), the K2 front panel reports P .09 LP instead
of P .5 LP. The 28MHz band always puts out the requested power.
I checked the voltage at V PWR (pin 2 of control board U8) and found
4.98 VDC which indicates either low transmit power or defective RF
detector. Since the 28MHz band works fine, I assume that there is
sufficient transmit power from the bandpass filter (BPF), so there
must be something wrong with the ALC detector on the XV60.
For completeness, though, I ran the signal tracing on page 14 of
Appendix E. Using an RF probe, I checked the Xmit mixer output (pin 4
of RF board U10) and found 0.03Vrms (just about double the expected
voltage) and then checked buffer output (pin 6 of RF board U9) and
found 0.58Vrms (just about triple the expected voltage) and then moved
to bandpass filter output at W6 (can't measure there with XV60
installed, so I measured at pin 5 of P1 on the XV60 and found
0.042Vrms which is just a little higher than expected. The same
voltage was found on both sides of XV60 C8 and at the anode of XV60
D3.
The cathode of XV60 D3 measures 0.07VDC (about .02VDC higher than
receive mode). Pin 7 of XV60 U2 reads 0.025VDC and pin 1 of XV60 U2
reads 1.6VDC. Pin 6 of XV60 P1 is at 1.1VDC as is RF board R66 (V
RFDET).
What I don't know is if the .042Vrms (the V BPF) at pin 5 of XV60 P1
is high enough or if the 1.1VDC V RFDET is too low?
Anybody have any ideas?
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