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41. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Tue, 25 Apr 2017 10:17:24 -0400; Efficiency is not high on my priority list "as long as the heat generated is easy to manage" and ceased to be a concern when the legal limit went to output instead of input.. OTOH predistortion, or A; /archives//html/Amps/2017-04/msg00265.html (13,821 bytes)
42. Re: [Amps] Price per Watt Conversation (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Tue, 25 Apr 2017 08:19:37 -0600; Keep in mind the fact that one could have the cleanest amp and even with nfb, alc etc. applied, it still only amplifies whatever is on the input. What goes into also goes out of but now amplified. So; /archives//html/Amps/2017-04/msg00266.html (10,932 bytes)
43. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Gary Schafer" <garyschafer@largeriver.net>; Date: Tue, 25 Apr 2017 10:55:15 -0500; Not necessarily. When an exciter with IMD is connected to an amp that produces IMD there can be a sum or difference of the two levels of up to 6 dB of the IM levels. So it is possible that the overal; /archives//html/Amps/2017-04/msg00267.html (12,618 bytes)
44. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Doug Renwick" <ve5ra@sasktel.net>; Date: Tue, 25 Apr 2017 10:16:59 -0600; Roger, The specifications for my Yaesu VP-1000 (Quadra) power supply state the input voltage is AC 100-240 V~, 50-60 Hz. This is different from the 220 V you mention. I can scan the spec sheet for fu; /archives//html/Amps/2017-04/msg00268.html (10,779 bytes)
45. [Amps] Price per Watt Conversation (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 25 Apr 2017 09:31:02 -0700; Not necessarily. When an exciter with IMD is connected to an amp that produces IMD there can be a sum or difference of the two levels of up to 6 dB of the IM levels. So it is possible that the overal; /archives//html/Amps/2017-04/msg00269.html (9,939 bytes)
46. Re: [Amps] Price per Watt Conversation (score: 1): Author: Richard Solomon <dickw1ksz@gmail.com>; Date: Tue, 25 Apr 2017 09:44:16 -0700; The 220 vac number comes from the power output spec that says 1,000 Watts out @ 220 vac. But the manual clearly states 100 - 240 vac input. 73, Dick, W1KSZ ___________________________________________; /archives//html/Amps/2017-04/msg00270.html (11,666 bytes)
47. Re: [Amps] Price per Watt Conversation (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Tue, 25 Apr 2017 17:05:23 +0000; -- ORIGINAL MESSAGE --(may be snipped) REPLY: What do you call "dirty as heck"? Haven't they passed FCC acceptance? Is that not good enough? Of course if you insist on parking your signal right next; /archives//html/Amps/2017-04/msg00272.html (9,205 bytes)
48. Re: [Amps] Price per Watt Conversation (score: 1): Author: "David Gow" <d.gow@frontier.com>; Date: Tue, 25 Apr 2017 10:49:10 -0700; The manual also states that the higher end of the 200-240 range is preferred because it helps to overcome line losses. Dave W7VM The 220 vac number comes from the power output spec that says 1,000 Wa; /archives//html/Amps/2017-04/msg00273.html (12,320 bytes)
49. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Tue, 25 Apr 2017 14:46:06 -0400; Not necessarily true now days. Predistortion may actually "clean up" a signal so the amp might actually have a cleaner signal out than the driving signal. As to the ALC driving problem, that appears; /archives//html/Amps/2017-04/msg00274.html (12,409 bytes)
50. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Tue, 25 Apr 2017 14:51:32 -0400; As I said, I have 2 of them and the PS is a hot topic on the Yaesu newsgroups and has been for some years. Mine say the same, but apparently the design hasn't changed, just the manuals.? 73, Roger (K; /archives//html/Amps/2017-04/msg00275.html (11,253 bytes)
51. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Tue, 25 Apr 2017 15:20:10 -0400; The FCC has absolutely no specifications for IMD in amateur service. Unfortunately, ARRL refuses to "call out" transceiver and amplifier manufacturers who produce products with high levels of IMD (as; /archives//html/Amps/2017-04/msg00277.html (10,420 bytes)
52. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Doug Renwick" <ve5ra@sasktel.net>; Date: Tue, 25 Apr 2017 13:26:28 -0600; My manuals have not changed for the last 12 years and maybe forever. The input voltage spec is AC 100-240 V~, 50-60 Hz in all the manuals I have. There is a little concern about current line voltages; /archives//html/Amps/2017-04/msg00278.html (10,752 bytes)
53. Re: [Amps] Price per Watt Conversation (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Tue, 25 Apr 2017 19:49:52 +0000; -- ORIGINAL MESSAGE --(may be snipped) REPLY: So as long as you are over 1 km away, anything goes? I know that's not what you mean, but it illustrates the problem of writing a spec that will satisfy; /archives//html/Amps/2017-04/msg00279.html (9,460 bytes)
54. Re: [Amps] Price per Watt Conversation (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 25 Apr 2017 20:37:07 +0000; Jim, lousy imd, or better IMD and lousy 35% eff..take your pick. Yes. You see? That's why I think that we need to look forward, forget conventional old-fashioned class AB linear amplifiers, and devel; /archives//html/Amps/2017-04/msg00281.html (14,553 bytes)
55. Re: [Amps] Price per Watt Conversation (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Wed, 26 Apr 2017 08:46:48 +1200; Of course it is, because it is a whole lot of imaginary crap, talked about by a whole lot of non-constructors, and non-transmitters. If you're not constructing and you're not transmitting, then you'r; /archives//html/Amps/2017-04/msg00282.html (9,032 bytes)
56. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Tue, 25 Apr 2017 16:49:06 -0400; using a single one of the proper voltage? I fail to see the point!" Because 50V-55V @ 50A supplies are plentiful through the telecom surplus market. For example, I recently purchased a NOS 3KW Eltek; /archives//html/Amps/2017-04/msg00283.html (14,211 bytes)
57. Re: [Amps] Price per Watt Conversation (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Tue, 25 Apr 2017 15:46:44 -0600; Yes the 9v battery method does work. I was only saying that any amp even at reduced drive levels will amplify the signal and anything else like noise into it. Gozinta gozouta. If that amp has imd pro; /archives//html/Amps/2017-04/msg00284.html (11,803 bytes)
58. Re: [Amps] Price per Watt Conversation (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Tue, 25 Apr 2017 16:14:17 -0600; It all depends on the transformer specs., a good example is the yaesu FL-7000 which has a transformer designed for 220vac on the primary. Most have 240v service today (ours is consistently 248) so if; /archives//html/Amps/2017-04/msg00285.html (13,972 bytes)
59. Re: [Amps] Price per Watt Conversation (score: 1): Author: Thomas Walsh <w2co@comcast.net>; Date: Tue, 25 Apr 2017 16:25:13 -0600; That's why I use primarily CW, to this day still the easiest mode for dxing, even with low power and/or a slightly dirty amp it's not until someone goes to slop bucket with that brown rice box...then; /archives//html/Amps/2017-04/msg00286.html (10,865 bytes)
60. Re: [Amps] Price per Watt Conversation (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Tue, 25 Apr 2017 22:45:14 +0000; -- ORIGINAL MESSAGE --(may be snipped) REPLY: Cost. 50 VDC 3 kW supplies are available on eBay dirt cheap. Obsolete telephone equipment. 73, Bill W6WRT _______________________________________________; /archives//html/Amps/2017-04/msg00287.html (8,527 bytes)

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