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Re: RE: sewer pipe



As a suggestion do not over look the dilectric constant and the thickness of 
the pipe. At 2 GHz the thicker pipe can cause refraction of the wave. This 
is not related to the disipation factor that is tested in the microwave 
oven. If used as a raydome best to make it a larger diameter and choose a 
thin wall pipe to  reduce this effect. Test in the far field will show if 
there is a problem by testing with the raydome on and off.
I tried several helix at 2.4 GHz made with copper tape wound on acrilic 
tubing with poor results. I suspect that this was in part the reason.

Art,
KC6UQH
----- Original Message ----- 
From: "Tom Clark, K3IO" <K3IO@verizon.net>
To: "AMSAT BB" <amsat-bb@amsat.org>
Sent: Sunday, April 30, 2006 9:47 PM
Subject: [amsat-bb] RE: sewer pipe


> After the plastic pipe has passed the microwave oven test, I'd try the GPS 
> test next. Hack up a piece so that it can cover the antenna on a handheld 
> GPS RX, and see if the S/N drops much.
>
> A GPS receiver like a Garmin 5 works well. The antenna connects via a BNC 
> connector and the antenna can can be removed and placed inside a piece of 
> the pipe. Look at the S/N on the bar display and see if the PVC pipe makes 
> a noticeable effect. The GPS frequency is 1575 MHz -- close enough to make 
> the test be relevant.
>
> 73, Tom
> ----
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----
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