[time-nuts] GPS antenna??

Bob Camp lists at rtty.us
Mon Apr 8 16:42:43 EDT 2013


Hi

More or less there aren't any GPS sats due north unless you can "see" over
the pole. That does assume you are in the northern hemisphere. If you watch
a "sats in view plot" for a couple days, Your odds of finding something are
best towards the equator and diminish as swing around towards the pole. If
you have a choice of windows, south is your best bet (in the UK).

Bob 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of lists at lazygranch.com
Sent: Monday, April 08, 2013 3:51 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] GPS antenna??

Aren't GPS birds all over the sky. South facing is for the Clarke belt. 
-----Original Message-----
From: "Bob Camp" <lists at rtty.us>
Sender: time-nuts-bounces at febo.com
Date: Mon, 8 Apr 2013 15:28:14 
To: 'Discussion of precise time and frequency
measurement'<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] GPS antenna??

Hi

Is the proposed window south facing? If not, you will need enough cable
outdoors to get your second antenna to a south facing location. 

Assuming it's south facing and reasonable sky view, have you tried a patch
antenna on / at the window? That should at least give you some idea of how
likely the signal is to get through it. It's not uncommon to run GPSDO's
with window mounted antennas. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Alan Melia
Sent: Monday, April 08, 2013 1:00 PM
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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