[time-nuts] Z3801 EFC error

Robert Benward rbenward at verizon.net
Tue Nov 1 08:59:30 EDT 2011

Good guess.  It's a 10811 with an additional oven wrapped around it for 
better thermal control.  I'll check it in a couple days when I get home.  Is 
this thermal fuse on the outside?

Anyone have a schematic of this unit?


----- Original Message ----- 
From: "J. L. Trantham" <jltran at att.net>
To: "'Discussion of precise time and frequency measurement'" 
<time-nuts at febo.com>
Sent: Tuesday, November 01, 2011 12:21 AM
Subject: Re: [time-nuts] Z3801 EFC error

>I think it uses a 10811 OCXO.  See if it is warm.  If not, perhaps the
> 'thermal fuse'?
> Joe
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Bob
> Sent: Monday, October 31, 2011 11:17 PM
> To: time-nuts at febo.com
> Subject: [time-nuts] Z3801 EFC error
> Hi,
> My Z3801 just crapped out.  It seems that the DAC has ramped up to the
> rails, 1048560, and I'm getting an EFC fault.  Any tips before I open the
> unit and start poking around?  The oscillator is running and pretty close 
> to
> 10MHz, I don't have any reference accurate enough to check it.  Any trends
> here, is it the EFC in the oscillator or is it the DAC and following
> amplifiers?
> Thanks, Bob
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