The program I was referring to is at http://www.arrl.org/files/
It is called Travanty.zip, by Frank Travanty, W9JCC. An Excel program to
analyze
antenna/tower loading.
Roger W5RDW
----- Original Message -----
From: "Roger White" <rwhitetexas@verizon.net>
To: <towertalk@contesting.com>
Sent: Thursday, December 11, 2008 10:05 AM
Subject: Re: [TowerTalk] Spacing between Antennas
> Search for the free program that will estimate the loading of stacked
> antennas on a common mast. One is an excel program that was listed I think
> on this reflector sometime ago.
>
> Roger W5RDW
> ----- Original Message -----
> From: "John Elsik" <wa5zup@msn.com>
> To: <towertalk@contesting.com>
> Sent: Thursday, December 11, 2008 9:50 AM
> Subject: Re: [TowerTalk] Spacing between Antennas
>
>
>>
>> I just can not help myself.
>> We do not even need to start the SteppIR debate. It will take off in a
>> direction that will get away from the fundamental issue.
>> That is way way too much antenna for that tower!
>> At least 42 square feet and over 600 pounds!! Not counting the rotor.
>> On a crankup no less!
>> You can not just add up the sq ft numbers when stacking antennas, it does
>> not work that way!
>> You (friend) need to do more research on tower loading.
>> Please stop and rethink the whole plan.
>> John wa5zup
>>> Date: Thu, 11 Dec 2008 07:29:50 -0500> To: navydude1962@yahoo.com;
>>> towertalk@contesting.com> From: n4zr@contesting.com> CC:
>>> marinesvcs@earthlink.net> Subject: Re: [TowerTalk] Spacing between
>>> Antennas> > At 07:12 PM 12/10/2008, Edward Sylvester wrote:> >Greetings
>>> to the Group!> >> >My friend is going to be installing a dream antenna
>>> set up for HF, on one > >tower. Here's the scenario:> >> >1 ea UST
>>> HDX689
>>> 89' tower> >1 ea 2 ele Optibeam 80 yagi (17 sq ft)> >1 ea MonstIR 6-40m
>>> yagi (25 sq ft)> >1 ea 24' three inch chromally mast> >> >The plan is to
>>> mount the 80m antenna towards the top of the mast and the > >Steppir
>>> underneath. Obviously the more space between the two, the > >better.
>>> Will
>>> 15' of separation between the two suffice, especially since > >the
>>> Steppir can retract all of its elements?> >> >Also, is the system beefy
>>> enough? Your opinions are welcome.....> > > My impression is that the
>>> tower isn't tall enough for that 80M antenna, > unless your friend has a
>>> hilltop QT
>> H, which could raise other issues, like > wind gusts and icing. I have
>> also heard horror stories from one local ham > whose MonstIR has had
>> repeated structural and electrical problems. I > wonder if others have
>> had
>> similar issues - he could practically buy a crane > with the rentals he's
>> paid.> > 73, Pete N4ZR> >
>> _______________________________________________>
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