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Total 4 documents matching your query.

1. Re: [VHFcontesting] [VHF] Re: Quick To the Mystery Machine! [The Case of the Phantom Pre-Amp] (score: 1): Author: "Les Rayburn" <les@highnoonfilm.com>; Date: Fri, 15 Aug 2008 15:18:51 -0500; Zack, Sorry, I forgot to mention. I'm a newcomer to VHF/UHF...and a filmmaker by profession. Can you put that into English and run it by me again? "Noise matched"? Matched to what exactly? Signed, Sl; /archives//html/VHFcontesting/2008-08/msg00118.html (16,281 bytes)
2. Re: [VHFcontesting] [VHF] Re: Quick To the Mystery Machine! [The Case of the Phantom Pre-Amp] (score: 1): Author: Zack Widup <w9sz@prairienet.org>; Date: Sat, 16 Aug 2008 09:18:54 -0500 (CDT); Hi Les, Well, to simplify it, what you want from your preamp is the optimized noise figure. This represents the lowest value for noise figure you can achieve at a given frequency or small range of fr; /archives//html/VHFcontesting/2008-08/msg00122.html (18,621 bytes)
3. Re: [VHFcontesting] [VHF] Re: Quick To the Mystery Machine! [The Case of the Phantom Pre-Amp] (score: 1): Author: Jim N7TCF <n7tcf@cox.net>; Date: Fri, 22 Aug 2008 13:48:27 -0700; I once had access to a 3GHz Network Analyzer after the engineering staff went home. With the help of an RF engineer, we set it up to measure my homebrew MRF966 preamps for 2m and 432. We found that m; /archives//html/VHFcontesting/2008-08/msg00137.html (8,707 bytes)
4. Re: [VHFcontesting] [VHF] Re: Quick To the Mystery Machine! [The Case of the Phantom Pre-Amp] (score: 1): Author: Zack Widup <w9sz@prairienet.org>; Date: Fri, 22 Aug 2008 16:30:56 -0500 (CDT); I have had pretty good luck designing amps using the gamma(optimum) [noise match] figure when it is provided by the manufacturer along with the s-parameters. I'm usually pretty close when doing it th; /archives//html/VHFcontesting/2008-08/msg00138.html (10,231 bytes)

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