[time-nuts] SRS PRS10 RFC

[Dana Whitlow]

Luiz,

I can express an opinion about the fan question.  I think it is a much
better idea to use a thermally-massive heat sink, still with enough
fins to dissipate the heat.  With a light (or no) heat sink the unit will
be much more responsive to local air temperature variations, meaning
that the frequency of the controlled oscillator will be less-well stabilized
by the feedback mechanism.

IIRC, you need to explicitly turn on the sync-to-PPS, although it's not
clear to me that there is any harm in leaving it on even when letting
the Rb run on its own.

At my previous job we had a PRS10 sitting on the shelf unused, and
I fired it up to see if it still worked (it did).  But it used a switching
P.S.
for the heavy-draw stuff (oven etc), and a linear supply for the main
electronics stuff.  I don't remember noticing any problems from that
arrangement.

Dana




On Mon, Dec 3, 2018 at 3:59 PM Luiz Alberto Saba <las at intercat.com.br>
wrote:

> Hi people
>
> I'm new on this list and miles below you.
>
> I'm thinking of use a PRS10 with a LEA-6T providing 1PPS and a Raspberry
> PI 3b+ with Lady Heather (2 instances, of course) to monitor/control
> both devices.
>
> Reasons for my request for your comments:
>
> 1. Power supply. 24 V switched is OK or the classic
> transformer/bridge/huge capacitors/regulator is best?
>
> 2. Heat. Do I leave PRS10 "as it is" or should i use heat dissipator/fan?
>
> 3. LEA-6T or LEA-5T or one of these GPSDOs: Trimble Thunderbolt; Trimble
> UCCM; Symmetricom UCCM; Oscilloquartz Star 4+; TruePosition gpsdo as the
> source of the 1PPS?
>
> 4. Does anyone here have LH 6 source code? LH 5 does not talk with PRS10
> (and with TruePosition too).
>
> 5. Just connect the 1PPS to PRS10 1PPS input or do I have to alter
> something on the configuration?
>
> That's it.
>
> Thanks for your comments
>
>
> Luiz Alberto Saba
>
> a recently nut from Brazil
>
>
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