I've also seen the trimmer cap ground break loose on quite a few units. Dave
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Sunday, January 13, 2008 7:40 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP10811 problem - wrong frequency Gentlemen- I too had a 10811 that was off frequency by 100KHz or so and although hard to believe, it was a defective xtal. The xtal was dead and had no series or parallel resonance near 10MHz. At the same time I had a 2nd 10811 that had a failed internal voltage regulator. While I had the two units a part, I was able to perform an S11 measurement of each xtal to confirm that the first unit did in fact act like an open circuit. I even swapped xtals to confirm that it was the xtal itself. So I guess a dead xtal is also possible. -Brian, WA1ZMS -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Bruce Griffiths Sent: Sunday, January 13, 2008 4:11 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP10811 problem - wrong frequency John Miles wrote: > Yes, I don't think a broken oven controller is going to pull the frequency > off by 890 kHz. :-) > > -- john, KE5FX > If the oscillator is oscillating in an undesired mode, then it is likely that the mode suppression network (C5, C6 L2, L3 in the schematic) in the oscillator has a faulty component or maybe a dry joint. It probably worthwhile to check all the frequency determining components in the oscillator at the same time. You'll need to disassemble the oscillator to check. Bruce _______________________________________________ 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.