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[aprssig] Helix Groundplane?

Andrew Rich vk4tec at people.net.au
Thu Dec 13 08:34:55 UTC 2007

Today I put my helix on the sitemaster and found it either needs a matching
plate on the first 1/2 turn or the 74 ohm matching section.

I was surprised. The VSWR has bad, but the signal improvement is brilliant.

Can't wait to make it properley

Andrew Rich VK4TEC
vk4tec at people.net.au <mailto:vk4tec at people.net.au>

-----Original Message-----
From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org]On Behalf Of Ev Tupis
Sent: Thursday, 13 December 2007 1:16 PM
To: TAPR APRS Mailing List
Subject: Re: [aprssig] Helix Groundplane?

The "groundplane" on a helix serves two major functions: impedence matching
and F/B ratio (as a shield to RF from behind).

Ev, W2EV

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