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Total 14 documents matching your query.

1. [Amps] Old Moto RF Decks (score: 1): Author: "Col. Paul E. Cater" <paulecater@gmail.com>; Date: Sun, 30 Nov 2014 16:26:30 -0500; I have some of the old Motorola (Micor?) RF decks. I have both the VHF & UHF types. The 2 meter is running a pair of the 8560A tubes. I can't recall the single tube in the UHF decks. The question bei; /archives//html/Amps/2014-11/msg00077.html (7,195 bytes)
2. Re: [Amps] Old Moto RF Decks (score: 1): Author: mike via Amps <amps@contesting.com>; Date: Sun, 30 Nov 2014 16:35:47 -0500; The EME guys convert these to run a pair of 8877 tubes. They sell for $100 or so. Mike I have some of the old Motorola (Micor?) RF decks. I have both the VHF & UHF types. The 2 meter is running a pai; /archives//html/Amps/2014-11/msg00079.html (7,533 bytes)
3. Re: [Amps] Old Moto RF Decks (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Sun, 30 Nov 2014 19:39:54 -0500; So then what do they do with the heasink which is almost the full amp section including chassis? Ive been staring at a VHF 2 holer for a couple of decades that was tossed into the trash bin at a hamf; /archives//html/Amps/2014-11/msg00080.html (8,894 bytes)
4. Re: [Amps] Old Moto RF Decks (score: 1): Author: John Kinney <J.Kinney@freescale.com>; Date: Mon, 1 Dec 2014 18:52:52 +0000; I have some of the old Motorola (Micor?) RF decks. I have both the VHF & UHF types. The 2 meter is running a pair of the 8560A tubes. I can't recall the single tube in the UHF decks. The question bei; /archives//html/Amps/2014-12/msg00005.html (7,835 bytes)
5. Re: [Amps] Old Moto RF Decks (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Mon, 1 Dec 2014 15:43:24 -0500; SSB IMD goes up rapidly above 300W per tube even with simplistic screen regulation. Be a good neighbor on the bands with those rather aged and obsolete designs (1947) that predate widespread SSB use.; /archives//html/Amps/2014-12/msg00008.html (9,607 bytes)
6. Re: [Amps] Old Moto RF Decks (score: 1): Author: Glen Zook via Amps <amps@contesting.com>; Date: Mon, 1 Dec 2014 22:08:32 +0000 (UTC); The 8560A is basically a conduction cooled 4CX250B. The Eimac specification sheet on the 8560A states that the characteristics are similar to, but not exactly the same, as the 4CX250B. The differen; /archives//html/Amps/2014-12/msg00010.html (8,395 bytes)
7. Re: [Amps] Old Moto RF Decks (score: 1): Author: John Kinney <J.Kinney@freescale.com>; Date: Mon, 1 Dec 2014 23:17:23 +0000; Hi Carl, You are correct. I saw very poor IMDs on the two tube version at anything over about 400 Watts. I friend of mine helped me build a filter, 5 poles as I recall, for use on the output. It brou; /archives//html/Amps/2014-12/msg00011.html (8,322 bytes)
8. Re: [Amps] Old Moto RF Decks (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Mon, 1 Dec 2014 19:01:34 -0500; BUT, harmonics and IMD are two completely different animals. Now when is Freescale going to offer a 2-30 or 2-50 mHz device that has high efficiency and very low IMD at the same time and be targeted; /archives//html/Amps/2014-12/msg00012.html (9,325 bytes)
9. Re: [Amps] Old Moto RF Decks (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 02 Dec 2014 20:06:14 +0000; Carl, Now when is Freescale going to offer a 2-30 or 2-50 mHz device that has high efficiency and very low IMD at the same time and be targeted at the linear SSB amp market? Freescale provides you th; /archives//html/Amps/2014-12/msg00014.html (9,779 bytes)
10. Re: [Amps] Old Moto RF Decks (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Tue, 2 Dec 2014 21:01:25 -0500; Manfred, I didnt become proficient in hollow state amplifier design by not extensively studying, and experimenting with linear circuits that were as strange in the 50-60's as SS is to many now. OTOH; /archives//html/Amps/2014-12/msg00015.html (12,145 bytes)
11. Re: [Amps] Old Moto RF Decks (score: 1): Author: KA4INM radio <ka4inm@gmail.com>; Date: Tue, 02 Dec 2014 22:28:15 -0500; /* snip */ If you want to keep things simple, the easiest way to reduce IMD in solid state amps is to give them lots of negative feedback. To do that, you have to start with excess gain! 30 years ago; /archives//html/Amps/2014-12/msg00016.html (8,702 bytes)
12. Re: [Amps] Old Moto RF Decks (score: 1): Author: "Peter Voelpel" <dj7ww@t-online.de>; Date: Thu, 4 Dec 2014 01:33:59 +0100; The Tram family of broadcast AM/DRM transmitters by Transradio seem to have no IMD issues. They make use of adaptive pre distortion and use LDMOS, however not sure whether Freescale ore NPX hardware; /archives//html/Amps/2014-12/msg00017.html (10,582 bytes)
13. Re: [Amps] Old Moto RF Decks (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 04 Dec 2014 13:25:50 +0000; Carl, SS QRO development has been slow and commercial user requirements have driven it, HF is a small market these days and the money is at VHF and up. And there is more money in medical equipment, t; /archives//html/Amps/2014-12/msg00018.html (10,556 bytes)
14. Re: [Amps] Old Moto RF Decks (score: 1): Author: KA4INM radio <ka4inm@gmail.com>; Date: Thu, 04 Dec 2014 13:39:05 -0500; Maybe when you think of class B solid state amps, you include a small idle current? If so, then it's fine, although that kind of operation, by the old definition is class AB. In that case there has; /archives//html/Amps/2014-12/msg00028.html (8,885 bytes)

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