[time-nuts] 10 mhz accuracy for a satellite system

[Richard Solomon]

There have been some Trimble Thunderbolts over on that auction site
that were being sold for $80 each (not surplus Telcom ones).
I grabbed two and they work.

My antenna was a "hockey puck" style antenna sitting on the window
sash, facing South.

73, Dick, W1KSZ

Sent from Outlook<http://aka.ms/weboutlook>
________________________________
From: time-nuts <time-nuts-bounces at lists.febo.com> on behalf of Grant Hodgson <grant at ghengineering.co.uk>
Sent: Monday, February 4, 2019 11:15 AM
To: time-nuts at lists.febo.com
Subject: Re: [time-nuts] 10 mhz accuracy for a satellite system

Paul

The keyword is GPSDO - GPS disciplined oscillator.  The vast majority of
these will give a 10MHz output.  The long term accuracy is the same as
the GPS navigation system, which for most purposes is similar to that of
national standards.  GPSDOs are more stable than most rubidium standards
in the long term, and GPSDOs are extremely common in most laboratories.

The Trimble Thunderbolt is very common and available on the surplus
market, as is the HP Z3801A.  James Miller (G3RUH) used to sell an
excellent GPSDO.  There are other home-brew designs available if you
want to build.   These have all been extensively characterised if you
want the details.

If you want to buy new, then there are products such as the Fury and
Firefly from Jackson Labs; , U-Blox have many offerings (not sure if
they do a GPSDO though).

Google GPSDO or GPS frequency standard, or check the leapsecond.com
website for more information - there's loads out there, it's just a case
of using the right term in the search engine.

regards
Grant

> Date: Sun, 3 Feb 2019 23:43:10 -0000
> From: "Paul Bicknell" <paul at bicknells.f2s.com>
> To: "'Discussion of precise time and frequency measurement'"
>        <time-nuts at lists.febo.com>
> Subject: [time-nuts] 10 mhz accuracy for a satellite system
> Message-ID: <D1F28D64EDD440EC834753538090F381 at precision380>
> Content-Type: text/plain;     charset="iso-8859-1"
>
>
> Dear all
> I currently use a 198 Khz off air standard but I can no longer use  600 khz
> since it moved from Rugby
> I have herd a lot about varies frequency references that use satellites
> This technology has improved immensely & become more affordable over the
> past 5 years
>
> So can a standard locked to a satellite be as good as a Rubidium ?
>
> What accuracy can I achieve for a satellite system below ?800 as I am not
> familiar with the latest that are on offer?
>
> Regards Paul Bicknell  South Coast UK
>
>

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