[time-nuts] Z3801A going into Holdover

[Bob kb8tq]

Hi

Which is why I asked about the EFC ….. they *should* start complaining when the EFC gets close to limit. 
How close? No idea. Are there other parameters it monitors? No idea. 

The (useless) heater box around the 10811 in the Z3801 can be opened up. Inside is a fairly normal 10811. On the ones
I have seen, there is a trimmer in the usual location. The gotcha is that with the “extended” EFC range on the
unit, it has drifted a *long* way by the time it fails. The trimmer may get it back, it may also not really have 
enough range to do what you need to do.

Bob

> On Jun 20, 2019, at 10:25 PM, Mark Sims <holrum at hotmail.com> wrote:
> 
> A few months ago, my 3801A started doing this.   It was tracking sats well (several years ago I had to replace the receiver because it had lots of problems acquiring and tracking sats).    I swapped in a replacement 10811 OCXO and that fixed the problem.
> 
> Apparently the problem with the receiver not tracking sats is usually due to the oscillator on the receiver drifting out of spec.  Some of them have an adjustment screw...
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