I knew a ham who was a captain for a major airline and had, from time to time,
done a lot of listening on 20 meters using the aircrafts' radios. I once asked
him how the sigs varied as you went really high, expecting that thousands of
feet would be noticeably better than at typical ham antenna heights. He
replied that from 35,000 feet down to around 50-100 feet, sigs were relatively
constant. Below that, the sigs dropped off noticeably. And I'm
thinking.whoa!. here he is landing a plane with a couple hundred passengers and
he's listening to 20 meters.????!
Anyway, that's one anecdotal datapoint applicable to your question.
----- Original Message -----
From: Paul Christensen<mailto:w9ac@arrl.net>
To: towertalk@contesting.com<mailto:towertalk@contesting.com>
Sent: Friday, December 01, 2006 4:56 PM
Subject: [TowerTalk] SteppIR MonstIR Modeling
I am negotiating the placement of a 4-element MonstIR on top of a 200' tower
at the St. Johns inlet of the Atlantic Ocean. If I proceed, only one antenna
can be used and it must be placed at the 200' level with no opportunity to go
lower.
Before moving further with negotiations, I want to ensure that the plots
don't produce some unintended consequences owing to the unusually high height
on the upper bands. I realize that as height increases, the number of lobes
along with associated maxima and minima field strength increases. DX is a
concern, stateside contesting is not. Anyone willing to run some elevation
profiles for 40M & 20M? Tnx!
Paul, W9AC
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