John, >Initial tuning is not the bugaboo. It's fairly easy to set the frequency with a synthesizer as a probe into the cavity via the circulator.
Once within 10Khz or so you then pick up the difference with the cavity temp. You adjust so that the cavity is set within the varactor tuning range. Remember the cavity is regulated to within .001 degree C to help stabilize the frequency. >The external insulating cavity wall is exposed to the differential but the internal tuned cavity has a vacuum inside and out so there is no differential pressure on it. >This Maser does not have cavity auto tune so is a bit less complex in that regard. Spin exchange tuning is the best way to get to the proper operating point. this requires some measurements and then setting the cavity varactor to the calculated voltage. Corby Dawson ____________________________________________________________ Obama Urges Homeowners to Refinance If you owe under $729k you probably qualify for Obama's Refi Program http://thirdpartyoffers.juno.com/TGL3141/4c7bd7f763237d4c80m04duc _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
