Check pin 5/46 on the DR-7 for the 500khz reference. If not there.
check the PBT/REF board as thats where the 500khz comes from.
73, Joe KC9LAD.
Well, I appreciate everyone's patience with my "TR-7 from hell" (as
someone so aptly called it). I've got full receive and transmit now,
all that's left is to iron out the DR-7 display issues.
I replaced the DR-7 with a known working board. In EXT, the frequency
counter works as expected, no problems there. In NORM, the display is
stuck at "51950". There is some significance to this number, as
indicated by the service manual:
"The counters will be preset to 5195, which will subtract the 48.05 MHz
First IF from the VCO frequency."
OK, so I've ruled out (for now) the DR-7. There is a signal from the
VCO at pin 5/66. Is there some other signal external to the DR-7 that
would cause the display to lock up on this particular setting?
--Brian/WA3ITE
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