Leon, Try listening for the oscillators on a general coverage receiver. That should help you find the one with the warble.
But before you do that, clean and reseat the Molex connectors. That is always the first thing to do when something goes wrong. 73, Bob AD3K On Feb 11, 2014, at 8:59 PM, Leon Zebrick <lzebr...@yahoo.com> wrote: > Tuning the "cal." signal and monitoring a transmitted carrier reveals a > slight frequency "warble" of sorts. PTO is clean and has the ground strap > modification, and this issue seems unrelated to the PTO, in that physical > movement or position of the PTO has no effect. This is some type of minor > instability seemingly not related to anything mechanical. Improves as rig > warms, but takes about an hour to clear. Any suggestions on how to narrow > this to the (presumably) offending oscillator? Seems like it would not show > up on a counter, but perhaps as "jiggle" on a scope? I believe I read > somewhere about an analog switch IC that can cause frequency jumping. The > frequency deviation is minor, but enough to roughen up received and > transmitted signals. Rig is very early SR#. General VFO stability is > acceptable. Could this be normal for the old rig? Thanks! > Leon (N5LAZ). > _______________________________________________ > Drakelist mailing list > Drakelist@zerobeat.net > http://mailman.zerobeat.net/mailman/listinfo/drakelist
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