[VHFcontesting] [VHF] Re: Quick To the Mystery Machine! [The Case of the Phantom Pre-Amp]
Jim N7TCF
n7tcf at cox.net
Fri Aug 22 16:48:27 EDT 2008
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 max gain and low noise are different points while tuning.
I would never have found best noise figure without the instrument. I had
attempted to bench tune it using on-air signals, the results were only a
S-Meter amp of course.
Such instruments are far less costly today and some well-heeled VHFer
have them. I hope to avoid blowing these devices up until I know someone
with another analyzer.
Jim N7TCF
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