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> > _______________________________________________>
> > > > _______________________________________________> TowerTalk mailing
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