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21. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Sun, 23 Apr 2017 11:01:21 -0400; OTOH spikes and overcurrent was a primary cause for mercury vapor rectifier failures and since the 1N5408 and 6A10 arrived I havent heard of a failure.....which doesnt mean they havent.... Carl 75.6%; /archives//html/Amps/2017-04/msg00216.html (14,702 bytes)
22. Re: [Amps] Price per Watt Conversation (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 23 Apr 2017 18:04:04 +0000; Hi Cathy, So would it be better to use 4 or or more devices with somewhat lower ratings for linear operation? I do think so. Specifically I would look for devices designed specifically for linear ser; /archives//html/Amps/2017-04/msg00221.html (12,558 bytes)
23. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Doug Ronald" <doug@dougronald.com>; Date: Sun, 23 Apr 2017 11:49:39 -0700; "I don't think there is an upper limit. It's more a question of what's practical. There is an increasing number of hams using homebrew amplifiers that use 16, 24, 32, or even 48 cheap 1-dollar MOSFET; /archives//html/Amps/2017-04/msg00222.html (13,373 bytes)
24. Re: [Amps] Price per Watt Conversation (score: 1): Author: "sm0aom@telia.com" <sm0aom@telia.com>; Date: Sun, 23 Apr 2017 21:28:28 +0200 (CEST); Well, I am with Manfred, and I believe the professional transmitter world also is.' Looking at what is offered to the commercial and military markets, they all use the distributed amplifier and hybri; /archives//html/Amps/2017-04/msg00223.html (13,753 bytes)
25. Re: [Amps] Price per Watt Conversation (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Sun, 23 Apr 2017 19:42:01 +0000; -- ORIGINAL MESSAGE --(may be snipped) REPLY: My IC-746 was severely damaged by a lighting strike before I became wise to lightning. Motherboard replaced. Now you have heard of one. No doubt there ar; /archives//html/Amps/2017-04/msg00224.html (9,236 bytes)
26. Re: [Amps] Price per Watt Conversation (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Sun, 23 Apr 2017 15:41:55 -0600; There has been excellent discussion here about the new LDMOS devices and their potential use for HF amplifiers. Manfred (XQ6FOD), Karl-Arne (VK5KLT) and Leigh (VE7RF) have each made strong points abo; /archives//html/Amps/2017-04/msg00228.html (13,091 bytes)
27. Re: [Amps] Price per Watt Conversation (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 23 Apr 2017 22:43:31 +0000; Hi all, nice to see so much activity in this matter! Here are my condensed replies to some posts by several of you. I'm merging them all into one post, instead of posting many separate replies. Jim,; /archives//html/Amps/2017-04/msg00231.html (29,308 bytes)
28. Re: [Amps] Price per Watt Conversation (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Sun, 23 Apr 2017 22:52:32 +0000; -- ORIGINAL MESSAGE --(may be snipped) REPLY: At that voltage it is tempting to directly rectify the AC line, greatly simplifying power supplies. Of course proper ground isolation practices must be t; /archives//html/Amps/2017-04/msg00233.html (8,503 bytes)
29. Re: [Amps] Price per Watt Conversation (score: 1): Author: Joe <nss@mwt.net>; Date: Sun, 23 Apr 2017 18:02:30 -0500; Ok say you did have a unit that could do that voltage, For a legal Limit Amp, what would be the current draw? I'm assuming all of Ohms Laws still apply don't they? Joe WB9SBD Sig The Original Rolling; /archives//html/Amps/2017-04/msg00234.html (9,349 bytes)
30. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sun, 23 Apr 2017 20:25:55 -0400; Couple of points: I hope I didn't make any of my usual math mistakes. The SS amps I'm familiar with do use a modular approach. Quadra and I think the Tokyo Hi-Power (no longer available) The quadra u; /archives//html/Amps/2017-04/msg00235.html (14,909 bytes)
31. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sun, 23 Apr 2017 21:09:13 -0400; I should have stated, ea pallet would be designed and powered for the power it would be running so the efficiency should still be good. The transistors just wouldn't be approaching their limits. 73,; /archives//html/Amps/2017-04/msg00237.html (20,873 bytes)
32. Re: [Amps] Price per Watt Conversation (score: 1): Author: "sm0aom@telia.com" <sm0aom@telia.com>; Date: Mon, 24 Apr 2017 15:53:27 +0200 (CEST); Quite interesting discussions. I would say that the major areas of improvement would be: 1) Better IMD, which could best be accomplished by adaptive predistorsion. I just took a look at the new gener; /archives//html/Amps/2017-04/msg00245.html (30,404 bytes)
33. Re: [Amps] Price per Watt Conversation (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 24 Apr 2017 20:56:11 +0000; Cathy, You guys should publish a construction article(s) in QST and other nations' equivalent magazines. A lot of us would love to build such an amp, but we're not competent to design it. Such articl; /archives//html/Amps/2017-04/msg00253.html (27,622 bytes)
34. [Amps] Price per Watt Conversation (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 25 Apr 2017 05:37:20 -0700; Jim, Cost is a powerful reason against that, in my opinion. It would be expensive overkill. I do think that using 4 devices (or more) is a good idea, but then these should be cheaper devices. A few d; /archives//html/Amps/2017-04/msg00258.html (10,485 bytes)
35. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Tue, 25 Apr 2017 08:59:00 -0400; on 11-15 vdc. Are they using loads of NFB ? Yes. Along with little to no compression and making sure that the IF stages aren't over driven. The ALC/IF circuits of amateur transceivers are responsible; /archives//html/Amps/2017-04/msg00259.html (9,233 bytes)
36. Re: [Amps] Price per Watt Conversation (score: 1): Author: Catherine James <catherine.james@att.net>; Date: Tue, 25 Apr 2017 13:05:30 +0000 (UTC); Sorry, what is "NFB"? Be careful with those TLAs. :-) 73, Cathy N5WVR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin; /archives//html/Amps/2017-04/msg00260.html (9,282 bytes)
37. Re: [Amps] Price per Watt Conversation (score: 1): Author: donroden@hiwaay.net; Date: Tue, 25 Apr 2017 08:09:36 -0500; Sorry, what is "NFB"? Be careful with those TLAs. :-) Theater of the Living Arts ?? LOL!!! Don W4DNR DonR _______________________________________________ Amps mailing list Amps@contesting.com http:/; /archives//html/Amps/2017-04/msg00261.html (8,763 bytes)
38. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 25 Apr 2017 06:16:50 -0700; of the amp by 3 db. On paper, to achieve say a 10 db improvement in IMD, you require 11 db of NFB. power. NFB will work on a SS amp, since the gain is sky high to begin with. Jim VE7RF Baffles me ho; /archives//html/Amps/2017-04/msg00262.html (10,044 bytes)
39. Re: [Amps] Price per Watt Conversation (score: 1): Author: Catherine James <catherine.james@att.net>; Date: Tue, 25 Apr 2017 13:24:00 +0000 (UTC); Thanks, Jim. I am learning something new here every day. I've been clear for some time on the fundamental conflict between good linearity (indirectly creating good IMD) and efficiency. With the last; /archives//html/Amps/2017-04/msg00263.html (9,311 bytes)
40. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 25 Apr 2017 07:02:59 -0700; these SS amps, they provide for a lower voltage, to increase eff, when using low power. The AL-600 has this feature with its manually selected 42V and also 50 V position. Other SS amps will auto swi; /archives//html/Amps/2017-04/msg00264.html (11,755 bytes)

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