[time-nuts] Power supply for 'Bay FE-5680A?

Fri Jan 6 18:34:29 UTC 2012

As I understand it, the "physics package" needs to get quite hot
to work.

I would expect the physics package to be well insulated and off
by itself, but this doesn't seem to be the case.

On 01/06/2012 10:06 AM, EWKehren at aol.com wrote:
> I do not understand why this is even discussed. Running at lower
> temperature will extend life and using a fan with temperature control will cost  no
> more than $ 12 and I challenge any of you how I can get for so little money
> more than one order of magnitude improvement. As I reported before I started
> out  with heat sink only and quickly realized that I would not be able to
> measure  aging because the last 2 digits where all over the place and unless
> you have an  environment where your lab is within 0.1C  you are throwing
> away the real  advantage of a Rb.
> I did enclose the Rb cell and the OCXO on a FEI 5962B, its modularity lends
>   it self for such testing, it was not worth the effort and the power saving
> was  minimal.
> Once my aging tests are completed I will test for 15 V voltage  sensitivity.
> Bert Kehren
>
>
> In a message dated 1/6/2012 11:35:02 A.M. Eastern Standard Time,
> nerd at verizon.net writes:
>
> A heat sink may not be required, per se, although I  would expect that a
> larger thermal mass and/or thermal  regulation via a closed loop fan
> controller will help smooth  out/stabilize temperature effects.
>
>
> On 01/06/12, Chuck  Forsberg WA7KGX N2469R<caf at omen.com>  wrote:
>
> The Tech  Manual does not call for heat sinking (unless I missed
> something).
> The top has labels over much of the  surface.
> The bottom has a plastic sheet between the circuitry  and bottom plate.
> It appears the unit was expected to be  rather hot when running.
> I have mine mounted on the out side  of the box using standoffs.
> On 01/06/2012 07:39 AM, Bob  Smither wrote:
>> -----BEGIN PGP SIGNED  MESSAGE-----
>> Hash: SHA1
>>
>> Chris Albertson wrote:
>>> On  Thu, Jan 5, 2012 at 6:11 PM,<[1]time-nuts at custodes.info>   wrote:
>>>
>>>>   l<[2]http://www.freqelec.com/rb_osc_fe5680a.html>  says 32W  peak,
> but then
>>>> also 15-18v at 700mA,  which doesn't make sense.
>>> It  will pull 35W for the first five or so minutes then the  current
> drops
>>> rather suddenly to  about 700mA.
>>>
>>> I have an  analog amp meter on my power supply and I can see a switch
> over
>>> after the unit heats up. They must run an  internal oven heater full
> tilt
>>> at  first then go into regulated mode.
>>>
>>> Some one else said you can cause the FE5680 to draw more power  in
> steady
>>> state mode by adding heat  sinking it. Yes that works. Seems the
> FE5680
>>> wants to be at some set temperature and the heat sink means it  takes
> more
>>> power to keep at the set  point. I just let the fe5680 rest on a
> small
>>> aluminum plate.
>> Have you measured the case  temperature of your FE5680?
>>
>> I put  mine on a heat sink and the case temperature stays around 50C.
> Without
>> the heat sink it was around 60C. Does anyone know  what temperature is
>> recommended? The 50C seems a little  hot, but the unit appears to work
> well.
>> - --
>> Bob Smither, PhD Circuit  Concepts, Inc.
>>
> =======================================================================
> ==
>> Government is not healthy for children and other  living things.
>> -- Jeff Daiell
>>
> =======================================================================
> ==
>> [3]Smither at C-C-I.Com [4]http://www.C-C-I.Com  281-331-2744(office)
> -4616(fax)
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>>
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> --
> Chuck Forsberg WA7KGX N2469R [8]caf at omen.com [9]www.omen.com
> Developer of Industrial ZMODEM(Tm) for Embedded Applications
> Omen Technology Inc "The High Reliability Software"
> 10255 NW  Old Cornelius Pass Portland OR 97231 503-614-0430
> _______________________________________________
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> References
>
> 1.  mailto:time-nuts at custodes.info
> 2.  http://www.freqelec.com/rb_osc_fe5680a.html
> 3.  mailto:Smither at C-C-I.Com
> 4.  http://www.C-C-I.Com/
> 5.  http://enigmail.mozdev.org/
> 6.  mailto:time-nuts at febo.com
> 7.  https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> 8.  mailto:caf at omen.com
> 9. http://www.omen.com/
> 10.  mailto:time-nuts at febo.com
> 11.  https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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-- 
Chuck Forsberg WA7KGX N2469R     caf at omen.com   www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
   Omen Technology Inc      "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430