[time-nuts] Re-radiating a GPS signal...??
alan.melia at btinternet.com
Thu Apr 12 13:29:14 UTC 2012
If the isolation is good and the "clear view" signal is reasonably strong,
the passive system works well in hangers, metalclad warehouses, ferry lorry
The passive system in the UK used to be refered to as the "Matlock
----- Original Message -----
From: "Michael Baker" <mpb45 at clanbaker.org>
To: <time-nuts at febo.com>
Sent: Thursday, April 12, 2012 2:05 PM
Subject: [time-nuts] Re-radiating a GPS signal...??
> So-- How do GPS signal re-radiators work?
> How do you place a GPS antenna on top of a building,
> pick up the signal with an LNA, amplify it to re-transmit
> on an inside antenna without the amplified re-transmitted
> signal getting back into the roof-top receiving antenna?
> I can see circumstances where a huge metal building
> (aircraft hangar?) might provide enough isolation to
> prevent problems, but in many cases I wonder about it...
> As an aside note-- I recall seeing, many years ago, a totally
> passive TV signal repeater on top of a tall hill in mountainous
> territory relaying a TV station signal to some homes in a valley
> just below. The passive repeater consisted of an array of
> high-gain UHF yagis pointing to the 40 mile distant TV station tower.
> The yagi array was coupled to another set of high-gain yagi
> antennas pointing down to the homesites in the valley. I was
> told that it worked pretty well.
> Mike Baker
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