[time-nuts] Re:FTS 5030 cesium frequency standard

[Dave Carlson]

Hubert,

You may have more difficulty in getting the microwave properly injected into
the FTS tube. That is to say, the 5061 harmonic generator is specifically
designed to match the cavity length  and temperature coefficient of the 5061
CBT and rarely works well with others. Usually the result is a measurable
amount of frequency offset.

If you are able to use the FTS harmonic generator and match the 5061A
microwave circuitry then the oven temperature should be a breeze.

The 5061A oven controller also provides the Hot Wire Ionizer current and the
Mass Spectrometer voltage in addition to the oven temperature. Do you plan
to not use the 5061A oven controller at all?

Dave

----- Original Message ----- 
From: "Hubert v. Bonhorst" <hbonhorst at aol.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Sunday, November 28, 2004 11:33 AM
Subject: Re: [time-nuts] Re:FTS 5030 cesium frequency standard


Thank you for your effort. The 5061A is not my problem. I' m in need for the
5030 diagrams. These are a real problem to find. My major problem is to know
the resistance of the heater thermistor at temperature. I do not know a
method to find this value, exept knowing the setresistor of the 5030.
Best regards,
Hubert
DB7ME
----- Original Message ----- 
From: "David G. Andersen" <dga at lcs.mit.edu>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Saturday, November 27, 2004 7:48 PM
Subject: Re: [time-nuts] Re:FTS 5030 cesium frequency standard


> On Sat, Nov 27, 2004 at 06:32:46PM +0100, Hubert v. Bonhorst scribed:
>> Some time ago I bought a 5030 module for parts. Now I want to use the
>> cesiumbeamtube for a very weak HP 5061A.
>> I' m looking either for a web link to download the servicemanual or just
>> for some information where Cesium oven temp.
>> is set. A diagramm of the power supply and the board located directly at
>> the tube would be very helpful. Might be someone from the list could
>> help.
>
> I have the 5061A operations and service manual online at
>
>  http://eep.lcs.mit.edu/time/5061/5061A_ops_and_schematics.pdf
>
> It's a scanned PDF of the manual, and is kind of large (16M).  The cesium
> oven controller is on page 7-45 (96 in the pdf).
>
>  -Dave
>
> -- 
> work: dga at lcs.mit.edu                          me:  dga at pobox.com
>      MIT Laboratory for Computer Science           http://www.angio.net/
>
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