On 2019-07-23 13:01, Charles Steinmetz wrote:
The later HP5328 "oscillator helper" boards have EFC pots for fine tuning the timebase frequency. This includes the US military versions that are so prevalent in the US. I have schematics showing this with both the 10544 (support board 05328-60027) and 10811 (support board 05328-60038) oscillators (production shifted from the 10544 to the 10811 during the 5328's run).
I found on the surplus market a board with a 10811-60111 OCXO. The board is marked 5328-20027. I suppose it is for the HP5328 counter. There is a trimmer marked "Fine Adjust" and two capacitor trimmers marked C12 and C15. I suppose the "Fine Adjust" trimmer is for the EFC, but don't quite understand what those C12 and C12 trimmers are for... Anybody knows ? Is there any schematics of this board lying around ? Thanks. 73 Alberto I2PHD _______________________________________________ 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.
