Screwdriver Antenna and COAX - MobileHam Forum at eHam.net

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Screwdriver Antenna and COAX	Reply
by KB0ETC on May 7, 2002	Mail this to a friend!
I am going to be performing a screwdriver antenna installation on my SUV. The antenna is a Tarheel screwdriver Model 200. My question is what is the best coax to use on the install? I am thinking of using Davis RF BuryFlex 9914, since it will be running the length of the chassis, and eventually ending up through a grommet in the floor pan. I think the Davis cable will be fine, since it has a high abrasion resistance, and is "water tight". I have also thought of using LMR 600DB for the installation. We get lots of rain here in TN, and want to do a "lifetime" install. I always over do things! Thanks in Advance for any suggestion or recommendations of whay you are using or have used. 73's

RE: Screwdriver Antenna and COAX	Reply
by WB2WIK on May 7, 2002	Mail this to a friend!
I would not use Bury Flex 9914 because it has a foam dielectric with a low melting temperature. I would not use LMR600 because (have you actually USED this stuff, before?) it is .600" diameter, very large, very stiff, cannot be bent around a corner, seems ridiculous for a mobile installation. I'd recommend "direct burial" RG213/U, which has a solid polyethylene dielectric and a much higher melting point; or, if you want something smaller diameter but nearly indestructible with an exceptionally high temperature rating (not to mention power rating, even under mismatch conditions), try mil-spec RG400/U. This is Teflon dielectric cable, rated to 200 degrees C, so it can be run nearly anywhere in a vehicle without concern for deforming, aging or melting. It's also readily available from any industrial cable supplier. I prefer the Teflon cable because it's so strong and impervious to practically everything. It can be operated underwater, even boiling water, indefinitely and there's no chance of it absorbing water. RG400/U also has two silver-plated copper braids and is 100% shielded. And, best of all, it can take ordinary PL259 UHF connectors with the standard UG175/U reducers, making installation a breeze. 73 de Steve, WB2WIK/6

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