I would imagine the switch selects every 50 or 100 MHz for easier identification of harmonic number. Bob On Friday, January 4, 2019, 3:10:36 PM PST, Brooke Clarke <bro...@pacific.net> wrote: Hi:
Made by Control Electronics Co. Inc, Model 121, with Navy Calibration Program stamp. This is a comb generator with outputs between 50 and 11,000 MHz that uses a 50 MHz crystal as the source. There's a switch for 50 or 100 Mhz the function of which I don't get. The 12AT7 dual triode tube used as the oscillator has the crystal connected between the two cathodes, a configuration I haven't seen before. The output circuit also seems strange. Any thoughts or links to documentation? https://prc68.com/I/VHF-UHFFrequencyCalibrator.shtml -- Have Fun, Brooke Clarke https://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html axioms: 1. The extent to which you can fix or improve something will be limited by how well you understand how it works. 2. Everybody, with no exceptions, holds false beliefs. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.