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[aprssig] 2M 1/4 Wave antenna

Andrew Rich vk4tec at tech-software.net
Sun Jan 14 08:44:54 UTC 2007


Searched for ages on google, looking for a 1/4 wave vhf calculation for
145.825 MHz

I remember that the 45 degree radials had to be a ratio longer or shorter
than the vertical element.

Assuming speed of light at 300

lambda = 300 / freq
lambda = 300 / 145.825 MHz
lambda = 2.05 M
1/4 lambda = 2.05 M / 4
1/4 Wave antenna = 0.5143 M
1/4 Wave antenna = 51.43 cm

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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