Steve Evans wrote:
Below you will find my attempt to show in text-form, a circuit
fragment from a 145Mhz amplifier:

The cap's value is 1nF; the inductor's is 0.4uH.
The cap (I assume) is to couple one amplifier stage into the next
(50ohm source/load) with minimal attenuation of the desired VHF
signal. But like what's the purpose of this inductor to ground??

A capacitor has a very low impedance to high-frequency (i.e., 145MHz)
signals and a very high impedance to low-frequency (i.e., DC) signals.

An inductor is the other way around - very low impedance to low
frequency (DC) signals and very high impedance to high frequency (2m).

The inductor allows DC bias currents to flow while not shunting the
desired 2m RF to ground.

The capacitor passes the 2m drive signal from the previous stage without
attenuation, while keeping the DC from the previous stage out of this one.
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com