[time-nuts] GPS antenna??

Rob Kimberley robkimberley at btinternet.com
Tue Apr 9 11:47:00 UTC 2013


Alan,

I used to do a lot of my Datum demos with customers with antennae up against
a window as outside access wasn't available. 

Usually worked OK, unless as you say, the glass is metalised.
Rob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Alan Melia
Sent: 08 April 2013 18:00
To: time-nuts measurement
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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