I agree with Bert. I remember an issue with another OCXO where the output coupling capacitor connection failed and outputs were low. Opening the OCXO and resoldering the connection returned the output to normal. Morion I think. I've never heard of this issue with the Trimble but not to say it couldn't happen. Found a link. https://www.febo.com/pipermail/time-nuts/2013-November/081126.html Good luck. Joe -----Original Message----- From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of ewkehren via time-nuts Sent: Saturday, January 27, 2018 8:44 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Trimble Thunderbolt Issue Do not toss, first check output of OCXO if good keep if you do not fiend the problem. If no output replace. If L H shows that it works bring OCXO output directly.Bert Kehren Sent from my Galaxy Tab® A -------- Original message --------From: Richard Solomon <w1ksz@outlook.com> Date: 1/26/18 1:39 PM (GMT-05:00) To: time-nuts <time-nuts@febo.com> Subject: [time-nuts] Trimble Thunderbolt Issue I have a T-Bolt whose 10 MHz output has dropped off to about 6 mV. Using T-Bolt Mon, all the Alarms are Green and it shows Tracking 3 or 4 Satellites (small Hockey Puck Antenna). Without a schematic I am lost as to where to look. Anyone have any suggestions ? I had to toss an otherwise working T-Bolt. Thanks for any assistance, Dick, W1KSZ Sent from Outlook<http://aka.ms/weboutlook> _______________________________________________ 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.

On Sat, January 27, 2018 9:47 am, J. L. Trantham wrote: > I remember an issue with another OCXO where the output coupling capacitor > connection failed and outputs were low. The thunderbolt uses the output of the OCXO for driving internal clocks, so likely the OCXO output is OK, but a buffer between the OCXO output and the connector is bad. -- Chris Caudle

One difficulty is in finding a Block Diagram with sufficient information to determine which chip does what. Does one exist ?? Thank you, Richard S. Sent from Outlook<http://aka.ms/weboutlook> ________________________________ From: time-nuts <time-nuts-bounces@febo.com> on behalf of Chris Caudle <chris@chriscaudle.org> Sent: Saturday, January 27, 2018 8:55:30 AM To: time-nuts@febo.com Subject: Re: [time-nuts] Trimble Thunderbolt Issue On Sat, January 27, 2018 9:47 am, J. L. Trantham wrote: > I remember an issue with another OCXO where the output coupling capacitor > connection failed and outputs were low. The thunderbolt uses the output of the OCXO for driving internal clocks, so likely the OCXO output is OK, but a buffer between the OCXO output and the connector is bad. -- Chris Caudle _______________________________________________ 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.