[time-nuts] GPS antenna??

[REEVES Paul]

That's odd, I'm sure we are using one here - and have been for quite a few years. It was used to supply gps signals to buoy systems which were being tested indoors. I seem to recall it was a bit 'hit and miss' and suffered from multipath problems (but it was set up by the sonar guys who don't know any better.....). Similar devices were shown at the NPL recently during a seminar on gps jamming/mitigation so they are still around.

Paul Reeves,   G8GJA

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Rob Kimberley
Sent: 09 April 2013 12:51
To: 'Tom Van Baak'; 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] GPS antenna??

Unfortunately, (I think this is still valid in the UK), we are not allowed
to use GPS re-radiators. I need to check latest rules & regs.
Rob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Tom Van Baak
Sent: 08 April 2013 22:12
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] GPS antenna??

Alan,

Google for words like GPS re-radiator or GPS repeater. There are also units
on eBay. If not to buy, at least to study examples.

The one I have is made by www.gpssource.com but it seems you could build one
yourself. It's easy to test by looking at your indoor SV count and reception
levels. With patch antennae you don't have to worry about RHCP issues,
right?

/tvb

----- Original Message -----
From: "Alan Melia" <alan.melia at btinternet.com>
To: "time-nuts measurement" <time-nuts at febo.com>
Sent: Monday, April 08, 2013 9:59 AM
Subject: [time-nuts] GPS antenna??


> 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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