Towertalk
[Top] [All Lists]

[TowerTalk] Fwd: Stacking question - another reality data point

To: towertalk@contesting.com
Subject: [TowerTalk] Fwd: Stacking question - another reality data point
From: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Reply-to: Hans Hammarquist <hanslg@aol.com>
Date: Thu, 11 Aug 2016 11:48:08 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
 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 K3L
 R - 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 
K3LR______________________________________________________________________________________________TowerTalk
 mailing 
listTowerTalk@contesting.comhttp://lists.contesting.com/mailman/listinfo/towertalk
 
______________________________________________________________________________________________TowerTalk
 mailing 
listTowerTalk@contesting.comhttp://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

<Prev in Thread] Current Thread [Next in Thread>