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1. [Amps] Vacuum Relay Question (score: 1): Author: Jim Garland <4cx250b@miamioh.edu>; Date: Sun, 25 Jul 2021 10:17:30 -0600; I'm repairing lightning damage to a 160m matching network at the base of my 80m 1/4 wave vertical, and am using a Kilovac H-16 (basically same as a Jennings RB3) DPDT vacuum relay in the network, wh; /archives//html/Amps/2021-07/msg00070.html (7,313 bytes)
2. [Amps] Vacuum Relay Question (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Mon, 26 Jul 2021 05:08:24 -0500; I would not use a vacuum relay in a matching network for a 1/4 w. antenna. That's a low v. high current setup calling for open frame contactors or at least large open relays. Perhaps this information; /archives//html/Amps/2021-07/msg00071.html (6,597 bytes)
3. Re: [Amps] Vacuum Relay Question (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Mon, 26 Jul 2021 07:29:22 -0700; Im open to your suggestion, Rob, but dont understand it. What do you mean by low v high current setup? The matching network is in a very compact weatherproof enclosure at the base of a 70 foot self-s; /archives//html/Amps/2021-07/msg00072.html (9,107 bytes)
4. Re: [Amps] Vacuum Relay Question (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Mon, 26 Jul 2021 10:54:06 -0500; A 1/4 w. monopole load is a low Z load; that means high current, low voltage, i.e. it is not a voltage fed antenna. Therefore there isn't high voltage involved. You can operate without a vacuum relay; /archives//html/Amps/2021-07/msg00073.html (7,546 bytes)
5. Re: [Amps] Vacuum Relay Question (score: 1): Author: Jim Garland <4cx250b@miamioh.edu>; Date: Mon, 26 Jul 2021 11:13:14 -0600; Hi Rob, I agree with everything you say. I'm afraid didn't make clear the purpose of my matching network. It does just what you suggest: when on 80m circuit routes the transmitter directly to the b; /archives//html/Amps/2021-07/msg00074.html (8,877 bytes)
6. Re: [Amps] Vacuum Relay Question (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 26 Jul 2021 10:59:00 -0700; I don't understand this concern. Vacuum relays have been widely used for decades for antenna switching in power amps, where the impedance, and thus voltage and current, are the same as for this appli; /archives//html/Amps/2021-07/msg00075.html (7,763 bytes)
7. [Amps] Vacuum Relay Question (score: 1): Author: "jim.thom jim.thom@telus.net" <jim.thom@telus.net>; Date: Mon, 26 Jul 2021 13:17:59 -0700; <A 1/4 w. monopole load is a low Z load; that means high current, low <voltage, i.e. it is not a voltage fed antenna. Therefore there isn't <high voltage involved. You can operate without a vacuum re; /archives//html/Amps/2021-07/msg00076.html (10,599 bytes)
8. Re: [Amps] Vacuum Relay Question (score: 1): Author: Aleksandar Petkovic <vk6apk@bigpond.com>; Date: Tue, 27 Jul 2021 07:59:51 +0800; I think that the point was that the expensive vacuum relay could be replaced by a much cheaper open frame relay arrangement in this application, where high impedance/voltage is not in the equation. T; /archives//html/Amps/2021-07/msg00077.html (8,969 bytes)
9. Re: [Amps] Vacuum Relay Question (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 26 Jul 2021 19:33:49 -0600; At my home station, a pair of Jennings 75-amp/7KV vacuum relays are placed in series with about 12 inches of separation between relays for added lightning protection. It's the equivalent of having tw; /archives//html/Amps/2021-07/msg00078.html (7,967 bytes)
10. Re: [Amps] Vacuum Relay Question (score: 1): Author: "Peter Voelpel" <dj7ww@t-online.de>; Date: Tue, 27 Jul 2021 09:44:44 +0200; I prefer vacuum relays outside, they are immune to corrosion and not that expensive when ex military stock from Russia like B1B or B2B SPST types. 73 Peter I think that the point was that the expensi; /archives//html/Amps/2021-07/msg00079.html (9,680 bytes)
11. Re: [Amps] Vacuum Relay Question (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Tue, 27 Jul 2021 06:23:02 -0500; Sure you can use vac. relays if they can handle the current. My point was that they're not necessary and since they are usually expensive, why use them when open large surface area contactors can be; /archives//html/Amps/2021-07/msg00080.html (7,995 bytes)
12. Re: [Amps] Vacuum Relay Question (score: 1): Author: Jim <jimw7ry@gmail.com>; Date: Tue, 27 Jul 2021 18:07:37 -0500; But there is no lightning inside of an amplifier... Hopefully. :) Thanks 73 Jim W7RY What am I missing? 73, Jim K9YC On 7/26/2021 3:08 AM, Rob Atkinson wrote: I would not use a vacuum relay in a matc; /archives//html/Amps/2021-07/msg00081.html (9,042 bytes)
13. Re: [Amps] Vacuum Relay Question (score: 1): Author: Aleksandar Petkovic <vk6apk@bigpond.com>; Date: Wed, 28 Jul 2021 14:31:25 +0800; The discussion pertained to relay connections in the matching network for a HF vertical antenna. 73, Alek, VK6APK Thanks 73 Jim W7RY What am I missing? 73, Jim K9YC On 7/26/2021 3:08 AM, Rob Atkinson; /archives//html/Amps/2021-07/msg00082.html (9,837 bytes)
14. Re: [Amps] Vacuum Relay Question (score: 1): Author: Jim <jimw7ry@gmail.com>; Date: Wed, 28 Jul 2021 06:33:48 -0500; And specifically lightning causing issues. So there's that... Did you see the smiley face at the end of my statement? Perhaps not.... Thanks 73 Jim W7RY 73, Alek, VK6APK Thanks 73 Jim W7RY On 7/26/2; /archives//html/Amps/2021-07/msg00083.html (10,568 bytes)
15. Re: [Amps] Vacuum Relay Question (score: 1): Author: Aleksandar Petkovic <vk6apk@bigpond.com>; Date: Wed, 28 Jul 2021 20:49:11 +0800; Yes, I did. . . . . . After the fact. I had it strike from within in one of my amplifiers a couple of months ago. A failed vacuum relay in the output resulted in the loading wafer of the bandswitch g; /archives//html/Amps/2021-07/msg00084.html (11,655 bytes)
16. Re: [Amps] Vacuum Relay Question (score: 1): Author: Jim <jimw7ry@gmail.com>; Date: Wed, 28 Jul 2021 20:50:11 -0500; Oh dear! That sucks Alek! But glad you were able to find the parts to fix it. 73 Thanks 73 Jim W7RY I had it strike from within in one of my amplifiers a couple of months ago. A failed vacuum rela; /archives//html/Amps/2021-07/msg00085.html (12,280 bytes)

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