[time-nuts] GPS antenna??

[Rob Kimberley]

You still need to set your position to get accurate results with one SV.
Rob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Grant Hodgson
Sent: 09 April 2013 09:28
To: time-nuts at febo.com; time-nuts-request at febo.com
Subject: Re: [time-nuts] GPS antenna??

Alan

As has already been stated by others, if the purpose of the GPS signal is
for a GPSDO, then putting an active patch next to a SW facing window should
work fine.  No need to re-radiate.  You only need to receive 1 satellite in
order to get a timing signal - more satellites will give better (lower)
jitter/ADEV, but if you just want an accurate frequency source for a counter
or signal generator then the setup you describe should be fine.

If that's the case, then it might be worth taking a Rubidium source as a
higher-performance back-up than the GPSDO in holdover, although some GPSDOs
are more equal than others in holdover performance.

regards
Grant

Quoting time-nuts-request at febo.com:
>
> Hi all an interesting problem you may have encountered, I want to use 
> a GPS frequency standard inside a building with no opening windows 
> (opening windows are known as air conditioning in the UK :-))  ) This 
> is part of a two day amateur microwave conference so we should have 
> the expertise.
>
> I intend to try and pass the signal through a a double glazed glass 
> window unit (hopefully not metalised) using a couple of patch 
> antennas. The outer GPS antenna is active so will need  a 5v supply 
> via an inserter. Inner patch active, outer patch passive to avoid 
> problems of feedback. Main antenna can be shielded from the "coupling" 
> either physically or with a slab of absorber.
>
> Has anyone tried this?.... does it work?.....any gotchas?
>
> Thanks
> Alan
> G3NYK
>
>
>

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