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? _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
