Some help please.
I have a Rohn 36 foot tower. On it I have a Hazer with a 10 foot mast
and Ham 4 rotator. I have my modest beam six feet up the mast. I would like
to put a 6 meter 4 element beam on this tower. Which beam should be on top
and what is the spacing given my limitations? Any and all help is greatly
appreciated.
Gerald Muller K9GEM
GMuller885@aol.com
In a message dated 8/19/2016 11:33:09 A.M. Central Daylight Time,
jim.thom@telus.net writes:
Date: Tue, 9 Aug 2016 21:06:54 -0400
From: "Tim Duffy" <k3lr@k3lr.com>
To: <k1ttt@arrl.net>, <towertalk@contesting.com>
Subject: Re: [TowerTalk] Stacking question - another reality data
point
I have 41 years experience in stacking 2, 3 and 4 Yagi's high.
After many hours behind the HFTA and NEC model engines - then putting
Yagi's
up in the air and using them for many years here at K3LR - these are the
stacking distances that have worked very well at this Western PA QTH:
Lowest Yagi height:
40 meters - 118 feet
20 meters - 50 feet
15 meters - 40 feet
10 meters - 33 feet
Then - stacking distances by band:
40 meters - 72 feet
20 meters - 60 feet
15 meters - 40 feet
10 meters - 33 feet
All OWA Yagi's on all bands at K3LR have booms that are 48 feet long (it
makes a difference).
73,
Tim K3LR
## How did the 118 ft for the lowest height for 40m come about ? That
and the
72 ft stacking distance on 40M ? That would put the upper 40m at 190
ft.
72 ft spacing on 40m is like 36 ft spacing on 20m.
## I would have thought that a 95 / 190 stack on 40m....with 95 ft
spacing would
have been the ticket.
Jim VE7RF
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