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[aprssig] Feeding impedance QUAD antenna

Andrew Rich vk4tec at tech-software.net
Sat Jan 27 05:55:56 UTC 2007


Gudday

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.

Cheers

-----------------------------------------
Andrew Rich
Amateur radio callsign VK4TEC
email: vk4tec at tech-software.net
web: http://www.tech-software.net
Brisbane AUSTRALIA

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