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The red spot and black spot FETs used in the G3WDG 10Ghz transverter from the 1990s were Plessey discards.
Presumably what the GATs morphed into after several years of R+D
On Wed, 9 Jun 2021 at 21:53, Clive Elliott GW4MBS via groups.io <firstname.lastname@example.org> wrote:
I still have this which I think is a GAT3, given to me 40+ years ago by either G3YGF or G3JVL. At the time I was living in Hampshire directly under their tropo path & gave me good experience in looking for weak signals. In fact I have to thank Julian for the nudge to take up CW to make full use of weak signals, hence my change in callsign.