Towertalk
[Top] [All Lists]

## Re: [TowerTalk] 4 square for 80

 To: "towertalk@contesting.com" Re: [TowerTalk] 4 square for 80 RT Clay RT Clay Sun, 25 Sep 2016 18:21:58 +0000 (UTC) mailto:towertalk@contesting.com>
 ``` > On Friday, September 23, 2016 7:47 PM, Rudy Bakalov via TowerTalk > wrote: > > Hi Tor, > This is very informative. > Quick question- why did you chose the to wire of your L to slope toward the > tower instead of away, sloping towards the ground? Would you reduce the > impact > of the tower in the middle by pulling the top wires away from the tower? > > Rudy N2WQ From: RT Clay I could slope them out and up into the surrounding trees, but it would be harder to make them identical in that case because the 4 support ropes are going out into trees at different heights. Also some trees are too close and would get in the way. But yes, my way should have more coupling to the central tower. Sloping them down decreases the feedpoint Z. Here's a comparison of several choices, all with a perfect ground, #12 wire. BTW there is nothing special about the height I use (45.5 feet), that is set by my smallest surrounding tree :). 1. straight vertical wire: R=36.0 2. N4OGW element: 45.5 feet vertical, then up to center tower: R=31.6 3. inverted L, 45.5 feet vertical: R=28.0 4. N4OGW element, with symmetric top wire (same slope as #2): R=27.8 5. N4OGW element, raised 10 feet (i.e. for elevated radials): R=27.5 When I measure R for each vertical with an antenna analyzer (with others isolated from ground), I get 37.4, 36.5, 37.1, and 37.1. All are tuned at about 3.475 MHz and the minimum dumped power is somewhere around 3.550. I have 40-60 radials on each vertical of varying lengths. Tor N4OGW _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
 Current Thread Re: [TowerTalk] 4 square for 80, (continued) Re: [TowerTalk] 4 square for 80, john@kk9a.com [TowerTalk] 4 square for 80, Russ Dearmore via TowerTalk Re: [TowerTalk] 4 square for 80, RT Clay Re: [TowerTalk] 4 square for 80, Jim Brown Re: [TowerTalk] 4 square for 80, Jeff AC0C Re: [TowerTalk] 4 square for 80, Joe Giacobello, K2XX via TowerTalk Re: [TowerTalk] 4 square for 80, Jeff AC0C Re: [TowerTalk] 4 square for 80, Tim Duffy Re: [TowerTalk] 4 square for 80, Rudy Bakalov via TowerTalk Re: [TowerTalk] 4 square for 80, RT Clay <= Re: [TowerTalk] 4 square for 80, Zivney, Terry Re: [TowerTalk] 4 square for 80, Steve London Re: [TowerTalk] 4 square for 80, Jim Brown Re: [TowerTalk] 4 square for 80, David Robbins Re: [TowerTalk] 4 square for 80, Wayne Kline Re: [TowerTalk] 4 square for 80, StellarCAT Re: [TowerTalk] 4 square for 80, Jim Brown Re: [TowerTalk] 4 square for 80, David Robbins Re: [TowerTalk] 4 square for 80, Jim Brown Re: [TowerTalk] 4 square for 80, Peter Voelpel