Hi I sure would do some quick continuity checks on the EFC line before I started swapping varicaps out. A bum solder joint opening up is a lot more likely than the varicap going nuts in a fashion that still lets the oscillator run.
Bob On Jan 15, 2010, at 7:08 PM, Neville Michie wrote: > Hi, > > I have two HP10811 oscillators that do not respond to EFC voltage. > The latest to fail had been quite accurately set against a TBOLT, > one morning (after being on standby in a HP5328A) it was off frequency > and would not shift with EFC but would adjust with the coarse adjust. > I have bought in two Phillips varicap diodes, BBY40 and BB149A, > but before I did some damage fault finding in the HP10811s I thought > it wise to ask for any advice that was available. > While I am playing with them I may try to readjust the temperature setting > of the oven to get on top of the turnover. Can anyone point me to that > article? > > cheers, Neville Michie > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.