Hello! I would be most grateful for expanded info about the Lady Heather red message: "OSC age alarm" Thanks in advance, Antonio CT1TE

Sounds to me like it's at the edge of (or even outside of)

What's the DAC voltage?

--msa

On Tue, Jul 19, 2011 at 02:48:29AM +0200, asmagal@fc.up.pt wrote: > I would be most grateful for expanded info about the Lady Heather > red message: > > "OSC age alarm" Sounds to me like it's at the edge of (or even outside of) DAC tuning range. i.e. the Thunderbolt may not be able to discipline the oscillator correctly. What's the DAC voltage? --msa

Hi The "OSC age alarm" is trying to estimate the aging rate of the OCXO in ppb per day. It then compares it to a limit. If it's past this magic limit you get an alarm. Since a lot of things can mess with the OCXO and *look* like aging, the alarm is not perfect. Bob -----Original Message----- From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of asmagal@fc.up.pt Sent: Monday, July 18, 2011 8:48 PM To: time-nuts@febo.com Subject: [time-nuts] TBolt question Hello! I would be most grateful for expanded info about the Lady Heather red message: "OSC age alarm" Thanks in advance, Antonio CT1TE _______________________________________________ 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.

Bob, 

	FWIW, since aging would normally slow down with time, 
this alarm is more of a "DAC is nearing limits."

	In Antonio's case he indicated to me off-list his DAC
voltage is beyond 4.1V.  If anyone has any suggestions for
re-tuning or replacing the OCXO, they might prove helpful to
him.

	--msa

On Tue, Jul 19, 2011 at 08:11:32AM -0400, Bob Camp wrote: > The "OSC age alarm" is trying to estimate the aging rate of the OCXO in ppb > per day. It then compares it to a limit. If it's past this magic limit you > get an alarm. Since a lot of things can mess with the OCXO and *look* like > aging, the alarm is not perfect. Bob, FWIW, since aging would normally slow down with time, this alarm is more of a "DAC is nearing limits." In Antonio's case he indicated to me off-list his DAC voltage is beyond 4.1V. If anyone has any suggestions for re-tuning or replacing the OCXO, they might prove helpful to him. --msa