Seymour, W6CCY does this ... or at least did at one time. He had 2 I believe
6 element 20's spaced horizontally on two different towers and played with
phasing (line length) to get them to work together. He said it was a real
barnstormer.
Gary
K9RX
-----Original Message-----
From: Hans Hammarquist
Sent: Thursday, August 11, 2016 11:48 AM
To: towertalk@contesting.com
Subject: [TowerTalk] Fwd: Stacking question - another reality data point
I have had an idea for some time: When you feed all these stacked antennas
in phase you will have optimum radiation to the horizon (or just above). My
idea is to add switchable delay lines to the higher located antennas. (You
could rather easily replace the damping networks in an attenuator with some
coax do make this.) Thereby you will be able to get optimum angle for
"higher up" propagation. You should select the steps to be small enough not
to get "gaps".
Any taker? (K1TTT?)
Hans - N2JFS
-----Original Message-----
From: Tom_N2SR via TowerTalk <towertalk@contesting.com>
To: towertalk <towertalk@contesting.com>
Sent: Wed, Aug 10, 2016 9:49 am
Subject: Re: [TowerTalk] Stacking question - another reality data point
I used to operate at N3RS, who has 5/5/5 on 20, 5/5/5 on 15, and 5/5/5 on
10. I forget the specific stacking heights/distances, but IIRC, they are
20: 37/77/117 feet, 15: 47/77/127 feet. 10: 25/50/87 feet. I am using 2
C31XR tribanders at 40 and 80 feet, with separate feedlines. On 10, I have
added a 5 element 10 at 25 feet, so while the distances are a compromise, I
will have 3/3 @ 40/80 on 20, 4/4 @ 40/80 on 15, and 5/5/5 @ 25/40/80 feet.
Which seems very similar to Tim's and well as Sig's stacking distances and
heights. I used HFTA not for the gain numbers, but as someone else pointed
out, to eliminate or move the nulls for the arrival angles from Europe
(mainly) and other directions. As John also pointed out, I only have 1
tower, and the C31XR's are just above the guy wires. So that's what I have,
and I have no plans to take the tower down to reconfigure the guy wires. I
know some guys have tribanders at 30/60/90 feet, but I chose not to do that.
Tom, N2SR From: "john@kk9a.com" <john@kk9a.com> To:
towertalk@contesting.com Sent: Wednesday, August 10, 2016 7:58 AM Subject:
Re: [TowerTalk] Stacking question - another reality data point These are
logical stacking distances and will definitely work well formost stations.
Most of us do not have dedicated towers for each band andwe have to adjust
the spacing and heights to clear guy wires and otherantennas. Fortunately
spacing distance is not overly critical. I usesimilar but slightly larger
spacing and similar low antenna heights toK3LR except on 40m.John KK9ATo:
<k1ttt@arrl.net>, <towertalk@contesting.com>Subject: Re: [TowerTalk]
Stacking question - another reality data pointFrom: "Tim Duffy"
<k3lr@k3lr.com>Reply-to: k3lr@k3lr.comDate: Tue, 9 Aug 2016
21:06:54 -0400I 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'sup in the air and using them for many years here at K3LR - these are
thestacking distances that have worked very well at this Western PA
QTH:Lowest Yagi height:40 meters - 118 feet20 meters - 50 feet15 meters - 40
feet10 meters - 33 feetThen - stacking distances by band:40 meters - 72
feet20 meters - 60 feet15 meters - 40 feet10 meters - 33 feetAll OWA Yagi's
on all bands at K3LR have booms that are 48 feet long (itmakes a
difference).73,Tim
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