[time-nuts] Z3801 saga

[Richard H McCorkle]

For a schematic of the Z3801A outer oven controller try here:

http://homepage.sunrise.ch/mysunrise/shegnauer/Z3801A/Outer%20Oven%20Controller/z3801a_outer_oven_description.htm

Hope this helps.

-- Original Message ----- 
From: "Magnus Danielson" <cfmd at bredband.net>
To: <time-nuts at febo.com>
Sent: Tuesday, July 25, 2006 3:32 PM
Subject: [time-nuts] Z3801 saga


> Fellow timenuts,
>
> The automation fell in my lap today. The Allan deviation plot show clear
> evidence of CW modulation (traditional ripple). Turing over to frequency
view
> there it is. Actually, it has both varying amplitude and frequency. As
> frequency lowers, so does the amplitude in frequency deviation. When it
hits
> around 450 mHz on the 10 MHz, the Z3801A goes into holdover.
>
> Now, it seems that there is some source of pumping up and down. I am
suspecting
> something like the oven control pumping. The longer time it spends the
longer
> the temperature goes up and down and thus modulate the frequency more and
more.
>
> Somebody sitting there with the outer and inner oven control schematics.
I've
> only seen parts of the inner one.
>
> Does this ring a bell somewhere?
>
> I'm off for a eh... escapade... so I may check email tomorrow morning, but
then
> I'm out in the woods listening to strange music, drinks, friends... ya
now!
>
> Cheers,
> Magnus
>
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