[time-nuts] Improving performance of a GPS antenna...?

[Robert Atkinson]

Hi Brooke,
RAM mat is a good idea, but I'm not sure that signal blocking is a good test, it could just be reflecting. A better test is to put a small piece in a microwave along with a cup of water (as dummy load) and see how hot it gets. Best done at low power and short time when household manager is not around. The smell if burning rubber in the microwave may not go down well.
 
Robert G8RPI.


________________________________
From: Brooke Clarke <brooke at pacific.net>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
Sent: Wednesday, 4 April 2012, 21:28
Subject: Re: [time-nuts] Improving performance of a GPS antenna...?

Hi Mike:

I used military surplus radar absorbing material to stop reflections on a satellite antenna by applying it to the rain 
gutter, see:
http://www.prc68.com/I/Images/SB_angw.jpg

A sheet of this stuff about 4 x 6 feet weighed maybe 40 pounds.  An easy way to confirm it works is to use it to block a 
receiver antenna and see how far the signal goes down.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Brooke4Congress.html


Michael Baker wrote:
> Hello, Time-Nutters--
>
> I saw a rather expensive GPS antenna made by one of the
> big-name GPS survey equipment mfgrs that was mounted
> on top of a 12 or 15 inch diameter disc about 3/4 inch thick.
>
> Turns out that the disc is made of some sort of RF absorbent
> foam covered by a weather-proofing coating of some sort.
>
> If one were to try to home-brew something like this, where
> would a small piece of the RF absorbent material be obtained
> without having to spend too much $$ for this experiment?
>
> Thanks for any feedback on this!!
>
> Mike Baker
> WA4HFR
> ----------------
>
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