[aprssig] Feeding impedance QUAD antenna
vk2tv at exemail.com.au
Sat Jan 27 01:06:46 CST 2007
Andrew Rich wrote:
> I am now up to the stage of feeding my 8 element quad for 145.825 MHz.
> I have been doing some reading and I see that most talk of a 100 ohm
> feed point.
> The most popular seems to be a 1/4 wave section of 75 ohm cable in
> series ?
> Does this look right:-
> Freq = 145.825 MHz
> 1/4 wave in coax = (200 / 145.825 MHz) /4 = 34.28 cm's of 75 ohm cable.
Depends on the velocity factor of the Q section.
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