The LO on my XV432 transverter seems to be very unstable. I think it's something more than just temperature drift as the frequency will sometimes jump by several kHz. It's almost as if the crystal is hunting between different modes of oscillation.
Prodding & wiggling the components in the LO circuit doesn't point to any obvious poor connection, although the crystal itself is sensitive to being touched, or heated by a finger. The LO alignment voltage at TP1 peaks at about 3.3V. I don't have the temperature oven for the crystal, although I think it's a requirement. But I'm concerned about the frequency jumping and a frequency drift of almost 10kHz which I would not expect even of a non-temperature controlled crystal oscillator. Any thoughts or pointers as to what could be wrong? TIA, Ian G4FSU ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
