Re: Grounded grid VHF front-end

On a sunny day (Mon, 18 Nov 2024 23:49:33 -0000 (UTC)) it happened
antispam@fricas.org (Waldek Hebisch) wrote in
<vhgjqb$2jj9t$1@paganini.bofh.team>:

I have no experience with radio design, but for curiosity looked at
several early TV sets from soviet block.  _All_ tube circuits that
I found were common cathode in first stage, in late sixties apparently
they converged on caskode configuration (two early designs had
two common cathode stages).  I found also few early transistor
circunts, majority was common base, one was common emiter.  I
think reasonable guess is that tube characteristics make caskode
preferable, while for transitors (at least those from sixties and
seventies) common base seem to be better.

Moved to satellite years ago, for very high frequencies GHz with tranistors all common emitter.
LNB example figure 5 for input stage:
 https://www.nxp.com/docs/en/application-note/AN11698.pdf

A similar Chinese LNB inside:
 https://panteltje.nl/pub/5_dollar_LNB_PCB_IMG_3582.GIF

That one has a ceramic oscillator,
there are ones with crystal oscillors,
 https://panteltje.nl/pub/octagon_twin_LNB_OTLSO_inside_RT320M_PLL_IMG_6538.JPG
have modified one for external crystal oscialliator locked to a Rubidium reference..
frequency stability required for SSB on satellite...
 https://panteltje.nl/pub/ethernet_controlled_LNB_reference_cicuit_diagram_IMG_6848.JPG

Those LNBs are really very low noise.
There is more to it ...