[TowerTalk] Antenna Distance From Shack

Robert Chudek - KØRC k0rc at citlink.net
Fri Aug 18 13:23:06 EDT 2006

Hi Pete,

Can you elaborate on the "1750 Hz (measured at 28 MHz) of 3/4" CATV" you mentioned? First, I assume you meant 1750 KHz, but aside from that, I'm not following what you mean.

Also, measuring loss at the shack with the MFJ-259B... Unless you install a non-resonant 50 ohm terminator at the opposite end, your readings in the shack will continue to 'vary widely' (although maybe not as "widely"). If you installed a 50 ohm load on one port of a remote antenna switch that would accomplish the task, but I'm thinking this is not what you had in mind regarding measuring loss.

73 de Bob - KØRC in MN

Message: 2
Date: Fri, 18 Aug 2006 08:13:14 -0400
From: Pete Smith <n4zr at contesting.com>
Subject: Re: [TowerTalk] Antenna Distance From Shack
To: TOWERTALK at contesting.com
Message-ID: < at mail.adelphia.net>
Content-Type: text/plain; charset="us-ascii"

Frank and Bill make good points.  For the last 10 years, I have been using 3/4" CATV for most of the 190-foot run from my house to my antennas.  To be specific, I use RG-213 up the tower and across the roof of my house to my 2nd-floor shack, but use multiples of a half-wave at 1750 Hz (measured at 28 MHz) of 3/4" CATV in between. 

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I want to be able to monitor loss from the shack, something that my composite feedline doesn't seem to let me do (the indicated loss on my MFJ-259B varies widely with frequency).

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