Re: Hatfield modulator: info.?
A snippet from Google books:
"Hatfield are good mixers Hatfield double- balanced modulators and mixers for 50 -ohms systems are available for immediate delivery.The 1700 Series can be used as an amplitude modulator, mixer, phase detector or current controlled V.H.F. attenuator There are also encapsulated versions for printed circuit mounting. • Excellent balance • Low noise factor • Wide band • P.C.B"
Lawrence.
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