[aprssig] Helix Groundplane?

Andrew Rich vk4tec at people.net.au
Thu Dec 13 03:34:55 EST 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

Looking for last minute shopping deals?
Find them fast with Yahoo! Search.

aprssig mailing list
aprssig at lists.tapr.org

More information about the aprssig mailing list