I saw a paper
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, active antenna referring to a GPD 462 . - Hybrid amplifierDoes anyone know what the internal circuitry was?
Brian
Teledyne GPD462
Apr 29, 2025
Last reply: 1 year ago
7 Replies
That’s one of Avantek’s “low cost” hybrid MIC amplifiers. I used its brother GPD-464 a fair amount back in the 80s. They were cheaper than their very nice GPD-211 iirc.
AFAICT it’s a vanilla NPN Darlington, like most others of that era.
I still have the databook someplace, I think.
Cheers
Phil Hobbs
I think you mean MMIC
Danke,
Nope.
It’s a hybrid, not monolithic.
Cheers
Phil Hobbs
OK, an HMIC it is. Blame the pedanticism on my upcoming Extra exam.
Danke,
I think of Darlingtons as slow - they usually are - but most MMICs are Darlingtons.
I like the simple, older parts, the ERA and LEE and GALI ones. The more modern self-biasing parts have loopy low-frequency response.
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Cheers
Phil Hobbs
Thanks,
I modelled a sort of lookalike using the Darlington mimic style using a resistive load rather than an inductor and a higher supply voltage ,
Cheers
Brian
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