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41. Re: [Amps] Relays (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Mon, 31 Mar 2008 08:04:56 -0700; Deterioration of the receive contact is the way they have failed for me. I had one last about 2 years and another that is still going after possibly 7 years (the amp is in the hands of another operat; /archives//html/Amps/2008-03/msg00386.html (9,656 bytes)
42. Re: [Amps] Relays (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Mon, 31 Mar 2008 16:27:21 +0100 (BST); Add the IC765 to your list of Icom radios with a negative holdover on the relay release in the full QSK mode. This is when using the 'accessory' ptt output (transistor keying) - it is just about zero; /archives//html/Amps/2008-03/msg00387.html (8,026 bytes)
43. Re: [Amps] Relays (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Mon, 31 Mar 2008 19:57:46 -0500; All this talk about relays and QSK has me wondering why aren't PIN diodes used more commonly? Then I began to read about some of the atrocious swtiching that goes on with some rigs. I have an AL-80A; /archives//html/Amps/2008-03/msg00396.html (8,204 bytes)
44. [Amps] relays (score: 1): Author: "Dick Hanson" <dick@dkhanson.com>; Date: Tue, 1 Apr 2008 08:58:13 -0500; More info on the above. There is a relay made by Schrack (German co) that is 12VDC, SPDT, PC mount with double pin-outs. They are enclosed in plastic and have very robust specs. I have used these wit; /archives//html/Amps/2008-04/msg00013.html (7,226 bytes)
45. Re: [Amps] Relays (score: 1): Author: wa9jml@tbc.net; Date: Tue, 1 Apr 2008 13:54:36 -0500; I am working on a boatanchor project, namely a power supply for my ancient Gonset G-76 transceiver. I am looking for a relay with a 12 volt AC coil, and with SPDT contacts that can switch 700 volts D; /archives//html/Amps/2008-04/msg00017.html (7,802 bytes)
46. Re: [Amps] Relays (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Tue, 01 Apr 2008 16:28:09 -0700; The cost of the diodes and associated circuitry is more than a cheap relay. And they are susceptible to damage from lightning-created transients. I had an Alpha 86 with pin-diode switching that worke; /archives//html/Amps/2008-04/msg00024.html (7,180 bytes)
47. Re: [Amps] Relays (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Tue, 01 Apr 2008 20:47:30 -0500; Thanks, Vic! Makes perfect sense. Yes, the PIN diodes are quite expensive, especially for ones capable of handling much power. 73, _______________________________________________ Amps mailing list Am; /archives//html/Amps/2008-04/msg00027.html (8,064 bytes)
48. Re: [Amps] Relays (score: 1): Author: "Alex" <alexeban@gmail.com>; Date: Wed, 2 Apr 2008 09:41:04 +0300; Hi guys: It so happens that during the last 2 years or so I worked on high power amplifiers in the kilowatt range . PIN diodes are made by very few manufacturers, coming and going all the time. They; /archives//html/Amps/2008-04/msg00028.html (9,470 bytes)
49. Re: [Amps] Relays (score: 1): Author: <d.cutter@ntlworld.com>; Date: Wed, 2 Apr 2008 10:30:31 +0100; Back in the days of steam radio, didn't we use TR switching using bottles? I seem to remember an 807 used as a switch, but the memory dims and I'm not next to my library to look it up. Do we *have* t; /archives//html/Amps/2008-04/msg00029.html (8,543 bytes)
50. Re: [Amps] Relays (score: 1): Author: "Alex" <alexeban@gmail.com>; Date: Wed, 2 Apr 2008 12:59:30 +0300; OH, YEAH! Back in the sixties the radio Bible carried for years a T/R switch based on a triode. It was based on the principle of grid leak bias i.e. the RF developed bias for the tube to cut it of an; /archives//html/Amps/2008-04/msg00030.html (9,229 bytes)
51. Re: [Amps] Relays (score: 1): Author: "R.C. Morris" <robrk@nidhog.net>; Date: Wed, 02 Apr 2008 09:38:39 -0500; The E.F. Johnson and B&W "electronic" TR switches worked just fine. Central 20A into three 4X250's. Worked all TV sets for five miles. http://www.universal-radio.com/used/sold109.html -- This message; /archives//html/Amps/2008-04/msg00032.html (10,545 bytes)
52. Re: [Amps] Relays (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Wed, 2 Apr 2008 09:45:15 -0400; And they were guaranteed TVI generators as well. Good concept on paper, not so good in actual use. Maybe with analog TV going the way of the dodo bird they can be used but what other neighboorhood pr; /archives//html/Amps/2008-04/msg00033.html (11,211 bytes)
53. Re: [Amps] Relays (score: 1): Author: John/K4WJ <k4wj@bellsouth.net>; Date: Wed, 02 Apr 2008 09:50:41 -0400; I use a DEO QSK-1500 for my QSK operations. This is a PIN diode unit that K8RR and W4TV designed back in the 80s. It was rather expensive in those days but there are a few of them out there that can; /archives//html/Amps/2008-04/msg00034.html (12,245 bytes)
54. Re: [Amps] Relays (score: 1): Author: "Harold Mandel" <hmandel@barantelecom.com>; Date: Wed, 2 Apr 2008 10:07:32 -0400; A few years ago while tackling the design error in the "Transmogrification of Blind Joe Death" conversion of the ETO Alpha 77dX into the 77sX, I had a chance to speak with several of the original des; /archives//html/Amps/2008-04/msg00035.html (8,721 bytes)
55. Re: [Amps] Relays (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 2 Apr 2008 10:32:40 -0400; I can't comment on the failure rate statistics, but I can tell you I have a real love-hate relationship with high-power PIN diodes. I know that they will not hold up as well as a vacuum relay under; /archives//html/Amps/2008-04/msg00036.html (9,369 bytes)
56. Re: [Amps] Relays (score: 1): Author: Greg - AB7R <ab7r@cablespeed.com>; Date: Wed, 02 Apr 2008 10:36:48 -0400; Can someone tell me what the extremes are on typical t/r relays in amps? Many newer amps seem fine with a 10ms delay from keydown to RF. I'm wondering if there are amps that are even quicker than thi; /archives//html/Amps/2008-04/msg00037.html (13,995 bytes)
57. Re: [Amps] Relays (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Wed, 02 Apr 2008 09:05:28 -0700; The RJ-1 type of relay can also be completely silent if you mount it with a few drops of silicone seal or on a piece of soft rubber. Mount it directly to metal if you like to hear it click! -- 73, Vi; /archives//html/Amps/2008-04/msg00038.html (8,086 bytes)
58. Re: [Amps] Relays (score: 1): Author: "Roger (K8RI)" <sub1@rogerhalstead.com>; Date: Wed, 02 Apr 2008 13:46:27 -0400; My first transmitter was a pair of 6L6s stuck in the corner of one of a huge, steel TV chassis. It eventually ended up with either a 12AT7 or 12AX7 as a TR switch. (Novice running QSK<g>) When I move; /archives//html/Amps/2008-04/msg00039.html (9,540 bytes)
59. Re: [Amps] Relays (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 2 Apr 2008 13:46:32 -0400; Good suggestion, Vic. Although typically, that's half the solution. Generally, cabling going to the relay's pins contributes much to sound conductivity. For example, RG-213/214, RG-142 and coaxial c; /archives//html/Amps/2008-04/msg00040.html (8,984 bytes)
60. Re: [Amps] Relays (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Wed, 2 Apr 2008 14:21:24 -0400; With a real amp the blower noise would mask the relay sound (; Besides, real hams wear noise eliminating headphones (;(; Except on AM that is and then the various relays clunking is part of the expec; /archives//html/Amps/2008-04/msg00041.html (10,396 bytes)

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