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Total 5 documents matching your query.

1. Re: [TowerTalk] Topband: Inverted L Tuning Question (score: 1)
Author: "DAVID CUTHBERT" <telegrapher9@gmail.com>
Date: Fri, 5 Dec 2008 03:03:00 -0700
Dick, I ran some simulations. There is very heavy coupling to the tower. That's not such a bad thing. The tower current is 180 out-of-phase with the inverted-L current. The GND return current is the
/archives//html/Towertalk/2008-12/msg00102.html (11,832 bytes)

2. Re: [TowerTalk] [Antenna-discussion] Best way of getting a line over a tree (score: 1)
Author: "DAVID CUTHBERT" <telegrapher9@gmail.com>
Date: Wed, 24 Dec 2008 11:17:13 -0700
Eric, here is a link to a review of a device made for this. They say it will shot a tennis ball 300 feet. It's $119. http://www.eham.net/reviews/detail/5199 There is also a slingshot/fishing reel dev
/archives//html/Towertalk/2008-12/msg00615.html (12,013 bytes)

3. Re: [TowerTalk] Topband: Antenna Modeling needed 160 vertical (score: 1)
Author: DAVID CUTHBERT <telegrapher9@gmail.com>
Date: Sat, 29 Aug 2009 18:04:57 -0600
Ed, here are some dimensions derived using EZNEC: Height 90', 4" diameter four #14 top hat wires 20' Base coil 5 uH (make coil 10 uH and tap it) Radiation resistance 22 ohms This article by K3LC will
/archives//html/Towertalk/2009-08/msg00577.html (9,597 bytes)

4. Re: [TowerTalk] Topband: Antenna Modeling needed 160 vertical (score: 1)
Author: DAVID CUTHBERT <telegrapher9@gmail.com>
Date: Sun, 30 Aug 2009 10:33:05 -0600
Ed, Let's compare the 90' top loaded vertical against a 90 foot vertical without top loading wires. Mechanically it might be nice to not have the top loading wires. In that case the radiation resista
/archives//html/Towertalk/2009-08/msg00582.html (11,714 bytes)

5. Re: [TowerTalk] Topband: Estimating RF Choke impedance (score: 1)
Author: DAVID CUTHBERT <telegrapher9@gmail.com>
Date: Fri, 30 Jul 2010 20:11:03 -0600
Picture 5 shows the generator connected to the coax inner conductors It should be connected to the coax shields. Dave WX7G _______________________________________________ ____________________________
/archives//html/Towertalk/2010-07/msg00723.html (9,542 bytes)


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