[time-nuts] 10811 Extra Lagging etc
tractorb at ihug.co.nz
Tue Jun 20 19:29:03 EDT 2006
----- Original Message -----
From: "Richard (Rick) Karlquist" <richard at karlquist.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Tuesday, June 20, 2006 5:03 PM
Subject: Re: [time-nuts] 10811 Extra Lagging etc
> Not a good idea. The best thing you could do to improve
> temp stability of a 10811 is to tweak the resistors that
> proportion the power between the two heater transistors.
> At some ratio, the thermal gain will peak at over 1000
> typically. If you just take pot luck, you would be lucky
> to do 100. You are still limited by the tempco of the
> electronics, no matter what thermal gain you achieve at
> the crystal.
> You should also be aware that the 10811 is fairly humidity
> sensitive, which can seem like temperature sensitivity
> if the humidity and temperature change together.
So if the 10811 is placed in a temperature and humidity controlled
environment it will do better-just don't apply lagging etc in close
round the actual oven assy itself?
Presume the aim is to have the humidity as low as possible?
What about the room temperature? I suppose the 'sweet point' depends
on the indivdual 10811 unit?
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.394 / Virus Database: 268.9.1/369 - Release Date: 19/06/2006
More information about the time-nuts