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Total 63 documents matching your query.

1. [AMPS] switches (score: 1): Author: carlseye@tampabay.rr.com (carl seyersdahl); Date: Fri, 9 Feb 2001 20:39:49 -0500; Tom: I've called many parts by the wrong names over the years, I guess. I was referring ,I guess, to the progressively shorting switch seen in so many amps today, as opposed to what I've seen in many; /archives//html/Amps/2001-02/msg00207.html (7,870 bytes)
2. [AMPS] switches (score: 1): Author: phil@vaxxine.com (Phil (VA3UX)); Date: Fri, 09 Feb 2001 21:31:43 -0500; Tom, if I read Carl's original question properly, I think he was asking ' what is the electrical purpose of choosing a progressively shorting switch over one that isn't'. Carl : yes/no ? Phil -- FAQ; /archives//html/Amps/2001-02/msg00208.html (8,678 bytes)
3. [AMPS] switches (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 9 Feb 2001 21:59:20 -0500; Hi Carl, them!! If you get a switch catalog you'll see the types explained. Even the Mouser catalog calls switches by the correct descriptions. If you order a "shorting switch" you get a simple one c; /archives//html/Amps/2001-02/msg00209.html (9,296 bytes)
4. [AMPS] switches (score: 1): Author: RMcGraw@InfoAve.Net (Bob & Linda McGraw K4TAX); Date: Fri, 09 Feb 2001 21:13:38 -0800; Phil: I agree. Anyway, as I understand things, it's best to short the un-used turns out to prevent a high EMF on un-terminated taps and thus causing a flash-over or arc in the bandswitch. At the same; /archives//html/Amps/2001-02/msg00210.html (9,860 bytes)
5. [AMPS] switches (score: 1): Author: ve3tu@rac.ca (Steve); Date: Sat, 10 Feb 2001 10:26:12 +0000; Hi yall, I believe that a switch that shorts out the unused taps on the tank cct. is the best way to go. The shorted coil in the tank next to the used tank portion will create a field that forces mor; /archives//html/Amps/2001-02/msg00211.html (9,579 bytes)
6. [AMPS] switches (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 10 Feb 2001 08:39:38 -0500; The side you short on makes no difference at all. Current in the coil is essentially equal all through the coil, as long as the coil is not so large it acts like a transmission line or antenna or th; /archives//html/Amps/2001-02/msg00216.html (9,704 bytes)
7. [AMPS] switches (score: 1): Author: carlseye@tampabay.rr.com (carl seyersdahl); Date: Sat, 10 Feb 2001 15:22:47 -0500; Just got back from a hamfest, folks!! Phil, VA3UX seems to be the only one that understood my question correctly. both switches do the same thing so what's the electrical difference. if any in the us; /archives//html/Amps/2001-02/msg00222.html (11,297 bytes)
8. [AMPS] switches (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 12 Feb 2001 09:49:52 -0000; Tom's points are very interesting: I've always been accustomed to switches where you actually design them yourself on the templates provided by the manufacturer, so you can decide on make before brea; /archives//html/Amps/2001-02/msg00232.html (9,031 bytes)
9. [AMPS] switches (score: 1): Author: sm5ki@algonet.se (Hans Goldschmidt); Date: Mon, 12 Feb 2001 11:50:48 +0000; 1-02-12 09.49, skrev Peter Chadwick på Peter_Chadwick@mitel.com följande: Why use rollers and switches at all? Series tuning a coil varies the reactance, doesnt it? Has anybody tried to an; /archives//html/Amps/2001-02/msg00233.html (10,095 bytes)
10. [AMPS] switches (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 12 Feb 2001 10:56:44 -0000; To cover 80 through 10, you need roughly a 10 to one variation in inductance. However, the coil resistance stays the same, so the unloaded Q goes down at the 'low inductance' end - if everything else; /archives//html/Amps/2001-02/msg00234.html (8,261 bytes)
11. [AMPS] switches (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 20 Feb 2001 08:01:24 -0000; I sent this last week but it didn't get through. This is very true. It should be noted that both Tom and I said 'can', however, and not necessarily that the problem will occur. If it does happen, the; /archives//html/Amps/2001-02/msg00259.html (8,125 bytes)
12. [AMPS] switches (score: 1): Author: 2@vc.net (measures); Date: Tue, 20 Feb 2001 07:34:07 -0800; splitting hairs cheers - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@c; /archives//html/Amps/2001-02/msg00264.html (8,472 bytes)
13. [AMPS] switches (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 22 Feb 2001 13:49:15 -0000; Actually, it's a pretty fundamental distinction in this case. A parasitic resonance occurring in the partially short circuited tank circuit could lead to flash over without any parasitic VHF oscillat; /archives//html/Amps/2001-02/msg00298.html (7,965 bytes)
14. [AMPS] Switches (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 11 Oct 2000 17:06:20 -0400; I'm looking at various switches for an HF PA. What's the highest anode voltage the model 80 and 86? Anyone know what switch type number Alpha used in the higher anode voltage amplifiers? Here's what; /archives//html/Amps/2000-10/msg00190.html (9,136 bytes)
15. [AMPS] Switches (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Wed, 11 Oct 2000 21:56:31 -0500; I have had numerous RSC switch failures over the years; all of which were self-induced for one reason or another. 100% of the failures were from contact to adjacent ceramic insulator. I have actuall; /archives//html/Amps/2000-10/msg00193.html (8,287 bytes)
16. [AMPS] Switches (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 11 Oct 2000 20:27:20 -0700; Hi Phil: Take a look at the Henry amplifier. Instead of using a wafer switch, at least some of the amps use a group of cams to operate switches. It would be fairly easy to duplicate those cams to mak; /archives//html/Amps/2000-10/msg00196.html (8,578 bytes)
17. [AMPS] Switches (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 12 Oct 2000 07:33:37 +0100; What do the manufacturers rate them at? Or is it a case that a switch that the manufacturers rate for the job is prohibitively expensive? 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/a; /archives//html/Amps/2000-10/msg00204.html (7,778 bytes)
18. [AMPS] Switches (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 12 Oct 2000 05:05:15 -0400; With some components, like switches, the only thing that matters is what the component really does in the real circuit. The RSC switch looks very large, but if you look at the smaller models the sta; /archives//html/Amps/2000-10/msg00211.html (8,585 bytes)
19. [AMPS] Switches (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 12 Oct 2000 10:21:25 +0100; Manufacturers ratings are a very good guide. If I design in a part rated at 4kV, and at 4kV, it doesn't hack it, the manufacturer is in for a very bad time. Generally, this is why manufacturers ratin; /archives//html/Amps/2000-10/msg00212.html (8,915 bytes)
20. [AMPS] Switches (score: 1): Author: kl7ra@blizzard.gcgo.nasa.gov (kl7ra); Date: Thu, 12 Oct 2000 02:48:57 -0800; Another option is to use the "best" switch and pass the extra cost on to the consumer. I would pay the extra, but I know bean counters have their own problems. Mil spec amps are expensive. Maybe the; /archives//html/Amps/2000-10/msg00214.html (8,559 bytes)

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