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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[AMPS\]\s+Switches\s*$/: 63 ]

Total 63 documents matching your query.

21. SV: [AMPS] Switches (score: 1): Author: sm5ki@algonet.se (sm5ki); Date: Thu, 12 Oct 2000 12:56:06 +0200; Get yourself one of the old ship transmitters now obsolete made by Standard Radio ( ITT ) in Stockholm. They used BIG switches that are really tough and all the switches used in commercial amateur li; /archives//html/Amps/2000-10/msg00215.html (10,316 bytes)
22. [AMPS] Switches (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 12 Oct 2000 11:56:47 +0100; I think Tom needs a manufacturer of switches for a design to be put in production. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative req; /archives//html/Amps/2000-10/msg00216.html (8,480 bytes)
23. [AMPS] Switches (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 12 Oct 2000 08:04:46 -0400; I need nine bands. Fewer positions won't help with the RSC switch, since it is limited by rotor to contact breakdown instead of contact to contact breakdown. The switch is the toughest component to; /archives//html/Amps/2000-10/msg00217.html (8,610 bytes)
24. [AMPS] Switches (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 12 Oct 2000 08:04:46 -0400; The bean counters are the end-users. Most Hams have limited budgets. Most people wouldn't pay $300 more for the PA just to get the same voltage breakdown, although some would because the switch "loo; /archives//html/Amps/2000-10/msg00218.html (9,383 bytes)
25. [AMPS] Switches (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 12 Oct 2000 13:11:31 +0100; For 9 ham bands, do you have to have 9 switch positions? 5 PA positions can cover 1.8 to 30 MHz without too much variation in operating Q; admittedly, you need something clever to switch input circui; /archives//html/Amps/2000-10/msg00219.html (8,679 bytes)
26. [AMPS] Switches (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 12 Oct 2000 08:18:42 -0400; Six meters and WARC bands. The problems is with an inductor right off the tube, the inductor needs to be switched on 6,10,12,15, and 17. That keeps the Q reasonable without a vacuum cap. 73, Tom W8J; /archives//html/Amps/2000-10/msg00220.html (8,905 bytes)
27. [AMPS] Switches (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 12 Oct 2000 13:26:48 +0100; Figure the best answer is building one, given the constraints. The Rich Measures web site has enough switch horror pictures; regardless of whether or not you accept his explanation of the cause of th; /archives//html/Amps/2000-10/msg00221.html (8,660 bytes)
28. [AMPS] Switches (score: 1): Author: phil@vaxxine.com (Phil (VA3UX)); Date: Thu, 12 Oct 2000 08:29:17 -0400; What about using a longer shaft, more wafers, larger indexing angle, and splitting up the bands between the front set of wafers and the back set of wafers. I know there will more wiring but it will h; /archives//html/Amps/2000-10/msg00222.html (9,302 bytes)
29. [AMPS] Switches (score: 1): Author: 2@vc.net (measures); Date: Thu, 12 Oct 2000 06:50:38 -0700; 10m RF amperes cause roughly 5 times as much heating as DC amperes. It is my opinion that Tom needs to use cooling air on bandswitches. end - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FA; /archives//html/Amps/2000-10/msg00226.html (8,513 bytes)
30. [AMPS] Switches (score: 1): Author: 2@vc.net (measures); Date: Thu, 12 Oct 2000 06:50:40 -0700; ... and he still does not realize that RF needs cooling air. Curiously, Heath had this figured out 30 years ago. end - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.co; /archives//html/Amps/2000-10/msg00228.html (9,154 bytes)
31. [AMPS] Switches (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 12 Oct 2000 07:00:49 -0700; It is possible to construct an output switch using standard components that greatly exceeds the normal switch voltage ratings. By using a separate wafer for each band and having each wafer separated; /archives//html/Amps/2000-10/msg00230.html (9,291 bytes)
32. [AMPS] Switches (score: 1): Author: 2@vc.net (measures); Date: Thu, 12 Oct 2000 07:14:34 -0700; When a 5000v bandswitch breaks down with a 2800v PS, and R-supp gets zapped on 80m, what else could it be, Peter? - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.conte; /archives//html/Amps/2000-10/msg00231.html (8,695 bytes)
33. [AMPS] Switches (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Thu, 12 Oct 2000 16:58:20 +0200; May I answer this one on his behalf? 1. Fish food. 2. Polly pooh. 3. Various other contaminants that break down the insulating properties of high voltage devices, especially when some heat is involve; /archives//html/Amps/2000-10/msg00233.html (8,746 bytes)
34. [AMPS] Switches (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 12 Oct 2000 11:14:51 -0400; The rotor to contact breakdown sets the limit. You can increase the other parameters, but not that one. That's the problem in the SB-220, AL-80 series style switches, as well as the JV-9000 series.; /archives//html/Amps/2000-10/msg00234.html (9,277 bytes)
35. [AMPS] Switches (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 12 Oct 2000 11:14:51 -0400; ...and Rich still thinks it's parasitics! Curiously everyone else had it figured out it isn't parasitics years ago. 73, Tom W8JI w8ji@contesting.com -- FAQ on WWW: http://www.contesting.com/FAQ/amps; /archives//html/Amps/2000-10/msg00236.html (8,820 bytes)
36. [AMPS] Switches (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 12 Oct 2000 08:48:57 -0700; If the rotor is not connected to anything, the spacing between the rotor and the contact is unimportant. By using adjacent contacts on the wafer as the switch - with the rotor simply acting as a conn; /archives//html/Amps/2000-10/msg00238.html (8,987 bytes)
37. [AMPS] Switches (score: 1): Author: Wt8r@aol.com (Wt8r@aol.com); Date: Thu, 12 Oct 2000 12:35:37 EDT; Well Tom, instead of making inflammatory personal attacks, why don't you tell us the answer? This really isn't the scientific and professional approach that one would expect of a person in your posit; /archives//html/Amps/2000-10/msg00240.html (9,226 bytes)
38. [AMPS] Switches (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 12 Oct 2000 13:32:34 -0400; Look at the front wafer of the AL-80B. That's the wafer that switches in the 160 padding cap. It has exactly that configuration. That switch is still limited by rotor to contact breakdown voltage. T; /archives//html/Amps/2000-10/msg00242.html (9,600 bytes)
39. [AMPS] Switches (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 12 Oct 2000 13:32:34 -0400; Hi Dave, At least that's better than the "position" you suggested in e-mail to me! We are talking about one aspect of the problem now, and the others have been discussed at length. The problem is inc; /archives//html/Amps/2000-10/msg00243.html (9,592 bytes)
40. [AMPS] Switches (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Thu, 12 Oct 2000 16:43:25 -0400; Of course, if the designer used tetrodes with passive grid and perhaps an input LPF to absorb any input capacitance (see Svetlana application note), then a five or six position output tank switch wou; /archives//html/Amps/2000-10/msg00249.html (9,423 bytes)

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