[time-nuts] Looking for Harris/Qbit amplifers
bruce.griffiths at xtra.co.nz
Tue Jan 24 14:17:01 EST 2012
ed breya wrote:
> Yes, those are handy amplifier modules - I always save any that I find
> in surplus RF gear. You can easily replicate the functions with modern
> gain blocks, or your own circuit using discrete parts, if you don't
> need the "drop-in" hermetic package style.
> The ones with about 10 dB gain are single stage shunt feedback
> amplifiers. Besides simplicity, the big advantage of store-bought ones
> is that they are exactly specified, while home-made ones are not, so
> it depends on the application.
> The larger TO-8 cans usually have built-in coupling caps, while the
> TO-5 types often do not. Quite a few manufacturers got into the VHF
> amplifier module business through the 70s and 80s, but I don't know
> who is still left making those old hermetic can styles. There are lots
> of makers and models of newer types in plastic packages
> Here are some that used to make hermetic styles - they all had more or
> less equivalent models available:
> Motorola (TO-5 MWA series only)
> Qbit (merged w/ Amplifonix?)
> I would look at Minicircuit Labs for modern amplifier blocks, maybe
> including hermetic - but those will be spendy brand new, regardless of
> the source.
Spectrum microwave <http://www.spectrummicrowave.com> inherited
<http://www.spectrummicrowave.com> the Qbit line.
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