[amsat-bb] Re: @m / &0cms Antennas

[Simon Brown]

Hi,

Thanks for the explanation :) . Looks like there aren't that many antennas
available, maybe it'll be the X-Quad from WIMO...

Simon Brown G4ELI
http://v2.sdr-radio.com


-----Original Message-----
From: i8cvs [mailto:domenico.i8cvs at tin.it] 

Stainless steel is a very bad material to be used to made antennas or to be
used as an electrical conductor because his specific resistivity is very
very high ( 1,61 x 10^-7 )

Since at Radio Frequency the RF current flows only over a thin surface of
the metallic material than the stainless steel could be used provided it is
electrolitically silver plated because the specific resistivity of silver is
the lowest possible ( 1,59 x 10^-9 ) but this procedure is very costly and
the silver over the stainless steel do not last very much !

Use only aluminum for your antennas as shows the very low specific
resistivity of aluminum as listed on the following address:

http://metals.about.com/od/properties/a/Electrical-Conductivity-In-Metals.ht
m