[TowerTalk] SteppIR MonstIR Modeling

[JoeCoolDXer]

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 at arrl.net> 
  To: towertalk at contesting.com<mailto:towertalk at 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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