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Total 11 documents matching your query.

1. Topband: Voltage at top of vertical and scaling? (score: 1): Author: Jim Miller <jim@jtmiller.com>; Date: Tue, 16 Apr 2019 08:38:03 -0400; Is there any data on what the voltage might be at the top of a full size 80m vertical at 1500w input? Is there some zener like ionization at the top that limits the voltage? If so is there a way to e; /archives//html/Topband/2019-04/msg00063.html (6,658 bytes)
2. Re: Topband: Voltage at top of vertical and scaling? (score: 1): Author: Don Kirk <wd8dsb@gmail.com>; Date: Tue, 16 Apr 2019 12:47:38 -0400; Hi Jim, Let me take a crack at this based on some online reading I just did, and the examples I found were based on treating the antenna as a transmission line (W8JI as well as others treat it this w; /archives//html/Topband/2019-04/msg00064.html (9,129 bytes)
3. Re: Topband: Voltage at top of vertical and scaling? (score: 1): Author: HP <pfizenmayer@q.com>; Date: Tue, 16 Apr 2019 19:52:24 -0400 (EDT); Just for grins - did a EZNEC free space - perfect ground - with 80 m vertical of #12 wire resonant at 3.55 mhz then put another #12 quarter wave resonant wire at right angles to the top thru 1 megohm; /archives//html/Topband/2019-04/msg00067.html (7,994 bytes)
4. Re: Topband: Voltage at top of vertical and scaling? (score: 1): Author: Jeff Blaine <KeepWalking188@ac0c.com>; Date: Tue, 16 Apr 2019 19:01:54 -0500; Is this an intellectual exercise or Jim do you want to do something at the top of this vert - like hang a vac relay there to engage some 160m top hat cap loading wires? 73/jeff/ac0c alpha-charlie-zer; /archives//html/Topband/2019-04/msg00068.html (9,543 bytes)
5. Re: Topband: Voltage at top of vertical and scaling? (score: 1): Author: Jim Miller <jim@jtmiller.com>; Date: Tue, 16 Apr 2019 20:22:12 -0400; Thanks all for your help on this. It sounds like my 15Kv relay at 53ft on the 68ft vertical is safe. It's never hot switched and provides connection to a 160 "tail" to give me my inverted L there. Be; /archives//html/Topband/2019-04/msg00069.html (9,688 bytes)
6. Re: Topband: Voltage at top of vertical and scaling? (score: 1): Author: Jeff Blaine <KeepWalking188@ac0c.com>; Date: Tue, 16 Apr 2019 19:42:09 -0500; I used a W1W relay at the top of mine for years without incident. 73/jeff/ac0c alpha-charlie-zero-charlie www.ac0c.com 73 jim ab3cv Just for grins - did a EZNEC free space - perfect ground - with 80; /archives//html/Topband/2019-04/msg00070.html (10,049 bytes)
7. Re: Topband: Voltage at top of vertical and scaling? (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Tue, 16 Apr 2019 17:47:53 -0700; Is there some zener like ionization at the top that limits the voltage? jim ab3cv Supposedly, if you run a kW to a mobile whip on 80 meters, and the whip has only a 1/4 inch metal ball on the top, y; /archives//html/Topband/2019-04/msg00071.html (9,087 bytes)
8. Re: Topband: Voltage at top of vertical and scaling? (score: 1): Author: "Gary Smith" <Gary@ka1j.com>; Date: Wed, 17 Apr 2019 01:06:04 -0400; When I was KA1DQG and in an apartment in Bridgeport, CT & not allowed to have antennas... I had two Hustler mobile sections I used opposed, as a short dipole on 80M that was on the carpet floor. Rig; /archives//html/Topband/2019-04/msg00072.html (10,136 bytes)
9. Re: Topband: Voltage at top of vertical and scaling? (score: 1): Author: Ulrich Weiß <dj2ya@t-online.de>; Date: Wed, 17 Apr 2019 10:40:26 +0200; Would like to know how to feed the relay at the top of the vertical... regards Uli, DJ2YA Is there some zener like ionization at the top that limits the voltage? jim ab3cv Supposedly, if you run a kW; /archives//html/Topband/2019-04/msg00073.html (10,075 bytes)
10. Re: Topband: Voltage at top of vertical and scaling? (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Wed, 17 Apr 2019 10:19:36 -0700; Run a single insulated wire from the bottom to the top of vertical. Connect a 0.1 uF bypass capacitor from the wire to the vertical at the top. Connect another bypass capacitor from the wire to the; /archives//html/Topband/2019-04/msg00082.html (9,929 bytes)
11. Topband: Voltage at top of vertical and scaling? (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Thu, 18 Apr 2019 05:25:37 -0500; I'd also put RF chokes in series with the DC relay lines, at the base of the vertical antenna to further keep RF off it but also to break it up so the relay line doesn't detune the 80 m. vertical, pe; /archives//html/Topband/2019-04/msg00088.html (8,515 bytes)

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