Bob said {the 10811 will run fine without the outer oven}
What I've seen is that a dual oven 10811 will run even **finer** and have up
to 100 times less sensitivity to normal room temperature changes with a
simple outer oven controller and a few mods.
In 2010 I compared the performance of a TBolt using an external dual oven
10811 Osc with and without it's outer oven being controlled.
There was more than a 60 to 1 improvement in the 10811's freq sensitivity to
small room temperature changes when the outer oven was active.
Open loop 10811 TC was <1e-12 /C with the dual oven on compared to 6e-11/C
with it off.
The green trace shows how much less EFC correction is needed to be to keep
the 10811's frequency constant when the dual oven is active.
http://www.febo.com/pipermail/time-nuts/attachments/20100223/c94d5eec/attachment-0001.gif
ws
*************************
----- Original Message -----
From: "Bob Camp"
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Friday, July 12, 2013 10:45 AM
Subject: Re: [time-nuts] 10811 outer oven controller.
Hi
The "outer oven" on that version is simply a warmup heater. If it's
operating properly, it drops out in normal operation. Put another way - the
10811 will run fine without it.
Bob
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