[time-nuts] Portable standard

[J. L. Trantham]

A 105B packaged with a 5087A with the appropriate doubler/divider cards can
give you 0.1, 1, 5 and 10 MHz and it is all battery powerable.  What I don't
know is whether the 105B's battery can also power the 5087A.  If so,
probably not for long.  Both are set up for external 24VDC power as well as
120VAC (and maybe 240VAC as well, I can't remember).

Joe

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Mark Spencer
Sent: Wednesday, April 06, 2011 8:00 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Portable standard


The HP105B might meet you needs if you can live with a 5mhz output.    

The packaging and DC power issues have been taken care of and adjusting the 
frequency is eaiser IMHO.


----- Original Message ----
From: Joseph Gray <jgray at zianet.com>
To: Discussion of precise time and frequency measurement
<time-nuts at febo.com>
Sent: Wed, April 6, 2011 12:13:37 AM
Subject: [time-nuts] Portable standard

If I were to buy an HP 10811A OCXO to use as a portable, battery powered
frequency standard, how would you recommend that it be powered and packaged?
Assume that the final package would be powered 24/7 and sitting on a shelf
most of the time. Prior to portable use, it would be checked against my
GPSDO. Portable use would probably be at worse a few days, but more likely
less than a day.

I'm thinking of using a couple of 12V, 7AH SLA batteries and float charging
them. Some charge circuits use pulsing current for SLA batteries. Would this
affect the OCXO?

Obviously too much air flow will be a problem. Can the OCXO, batteries and
associated circuitry be sealed in a box with no vent holes (not strictly air
tight)? What about putting the OCXO in a small styrofoam box by itself? Will
that cause overheating or other issues? How about vent holes in the overall
enclosure and baffles around the OCXO to minimize air flow?

Should I forget the whole idea and just buy a rubidium?

Joe Gray
W5JG

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