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Total 8 documents matching your query.

1. [Amps] mounting (UHF) RF powermodules (score: 1): Author: "pc5m, Carel" <pc5m@xs4all.nl>; Date: Sun, 23 Mar 2008 11:38:53 +0100; Hi, Anyone could point me to some resources describing the best way to mount RF powermodules for UHF use (like the Toshiba RA13H4047). ? Did googled around a bit (found a Motorola patent, 5546275) an; /archives//html/Amps/2008-03/msg00217.html (6,915 bytes)
2. Re: [Amps] mounting (UHF) RF powermodules (score: 1): Author: "Roger (K8RI)" <sub1@rogerhalstead.com>; Date: Sun, 23 Mar 2008 10:28:54 -0400; I'm not familiar with that particular transistor bu you might take a look at some of the commercial amps and see how they do it. Good Luck, Roger (K8RI) ______________________________________________; /archives//html/Amps/2008-03/msg00220.html (8,093 bytes)
3. Re: [Amps] mounting (UHF) RF powermodules (score: 1): Author: "pfizenmayer" <pfizenmayer@qwest.net>; Date: Sun, 23 Mar 2008 08:44:56 -0700; Forgot to mention , If you cannot find the EB's I can scan them out of an old MOT data book DL110. Carel , If this module is a ceramic substrate or even a soft substarte with smll ceramic carriers ,; /archives//html/Amps/2008-03/msg00222.html (8,115 bytes)
4. Re: [Amps] mounting (UHF) RF powermodules (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 24 Mar 2008 08:23:23 +0000; The substrate in these is alumina, so it's important to follow Hank's comments. Expanding on those, any heatsink you buy will not be flat enough without machining, ideally with a large diameter 'fly; /archives//html/Amps/2008-03/msg00232.html (7,671 bytes)
5. Re: [Amps] mounting (UHF) RF powermodules (score: 1): Author: peter.chadwick@Zarlink.Com; Date: Mon, 24 Mar 2008 12:49:24 +0000; be flat enough without machining, ideally with a large diameter 'fly' cutter. You are also looking for a good surface finish with machining ridges barely detectable with a fingernail. As well as flat; /archives//html/Amps/2008-03/msg00235.html (8,468 bytes)
6. Re: [Amps] mounting (UHF) RF powermodules (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 25 Mar 2008 08:08:18 +0000; The choice probably varies with the machinery available. Up to 6" wide I get things skimmed on a single pass and they give me a low roughness finish. With end cutters or slot drills the finish is us; /archives//html/Amps/2008-03/msg00247.html (8,420 bytes)
7. Re: [Amps] mounting (UHF) RF powermodules (score: 1): Author: Patrick Signs <psn7ic@hotmail.com>; Date: Tue, 25 Mar 2008 10:28:18 +0000; Look on the internet on various sites explaining how to lap a CPU and heatsink. Same techniques can be followed here. That is also assuming that your slab of copper if reasonably flat to begin with.; /archives//html/Amps/2008-03/msg00249.html (9,800 bytes)
8. Re: [Amps] mounting (UHF) RF powermodules (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Tue, 25 Mar 2008 08:41:49 -0400; Several years ago one of the commercial customers on my tower was having steady failures with a new UHF amp. After the 3rd set of finals he asked me if I had any ideas. The heatsink was about 17" x 1; /archives//html/Amps/2008-03/msg00251.html (10,200 bytes)

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