[time-nuts] Re-radiating a GPS signal...??

Bob Camp lists at rtty.us
Thu Apr 12 13:22:28 UTC 2012


Hi

The re-radiators are active devices. They are every bit as much a lightning
attractor as the GPS it's self. They also cost more than a TBolt (even at
current prices).

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Michael Baker
Sent: Thursday, April 12, 2012 9:06 AM
To: time-nuts at febo.com
Subject: [time-nuts] Re-radiating a GPS signal...??

Time-nutters--

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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