[time-nuts] Help needed with frequency standard

[Bob kb8tq]

Hi

> On Sep 30, 2020, at 11:45 AM, Luiz Alberto Saba <las at intercat.com.br> wrote:
> 
> 
> 
> Em 29/09/2020 14:08, Bob kb8tq escreveu:
>> 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.
> I was just wanderng what is the best thing to do, with the stuff that I already have, in order to have a poor substitute for a cesium...

A GPSDO, pretty much by it’s self *is* the best “poor substitute for a cesium”. The biggest improvement
over a stock part would be to go to L1 / L2. Past that you get into fancy loops and a *lot* of work.

Bob

>> 
>> 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 …..
> I have just one...
>> 
>> 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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> 
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