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.


----- Original Message ----- From: "Bob Camp" To: "Discussion of precise time and frequency measurement" <>
Sent: Friday, July 12, 2013 10:45 AM
Subject: Re: [time-nuts] 10811 outer oven controller.


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.


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