[time-nuts] Help needed with frequency standard

[Bob kb8tq]

Hi

You have a lot of stuff that runs off of GPS L1. Any “common mode” issues
(like ionospheric disturbances) will propagate into all of them. What impact that
has on each one is very much a “that depends” sort of thing. The firmware and
filtering quickly get into the act …. They all will wander, just not in exactly the
same way.

The PRS-10 does have an internal “sync” capability. The main purpose for the
input is to simply calibrate the device from time to time. It is not really intended
to replace a GPSDO. 

Any of the devices you have are fine for putting the PRS-10 on frequency to calibrate
it. All are equally likely to wander around. The PRS-10 will not help much with this wandering. 

You can look at all of this with something like a TAPR TICC. To look at lots of them
at once, a set of TAPR TICC’s would be nice to have …..

Bob

> On Sep 29, 2020, at 11:02 AM, Luiz Alberto Saba <las at intercat.com.br> wrote:
> 
> Hi guys
> 
> 
> I want a stable & reliable frequency standard.
> 
> I do NOT have a cesium beam.
> 
> I DO have a lot of gpsdos and some rubidiums.
> 
> Since I have one PRS-10 and this device has a 1 pps input, you already know what I'm thinking...
> 
> What I have:
> 
> Trimble Thunderbolt
> 
> Trimble UCCM
> 
> Symmetricom UCCM
> 
> Samsung UCCM
> 
> HP 58503A
> 
> TruePosition
> 
> Oscilloquartz Star 4+
> 
> and a little board with a ublox LEA 5T and 1 pps output.
> 
> Which device is more suitable for disciplining the PRS-10?
> 
> My gps antenna setup is:
> 
> Symmetricom 58532A on the top of the water tank of my building with a very good sky view.
> 
> A Raven Industries LA-21-1575-100-T. About 50 m of RG6.
> 
> A Symmetricom antenna distributor (don't remember the code but is the 4 outputs one)
> 
> By the way... Someone knows the delay of the inline amplifier and the antenna distributor? (for Lady Heather)
> 
> Mark Sims is out there reading this list? I'm having problems with LH 6.14 and the UCCM units.
> 
> Any help you can give me will be welcomed.
> 
> 
> Thanks
> 
> 
> Luiz Alberto Saba
> 
> from Santos - São Paulo - Brazil
> 
> 
> 
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