At 3/13/2006 19:26, you wrote:
> If you make a harness for that antenna use RG-59 or RG-11 - 75 ohm Cable
>to get match , don't use RG-58 or RG-8 it won't work
Why not? 2 50 ohm terminations (dipoles) T'd together make 25 ohms. Run
two 1/4 wave multiples (3/4, 1 1/4, etc.) from each T to get 100 ohms each
to a 3rd T, which then gives you 50 ohms for the feedpoint.
The reason it's important to use 50 ohm coax is because you can use a
silver-plated coax for the harness (I don't know of any 75 ohm coax that
has a silver-plated braid; it probably exists but is not
commonplace). RG-59 & RG-11 do not have a silver-plated braid & will
eventually generate desense when used in duplex service.
Bob NO6B
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