[Amps] Tuned Input for G-G 50Mhz amp

[Larry Benko]

We generally think of PI networks as "low pass" and Tee networks as 
"high pass" but there are PI networks and Tee networks of both "low 
pass" and "high pass" topologies.  A low pass PI network (CLC) and a low 
pass Tee network (LCL) have different values of components but can be 
identical for input impedance, output impedance, and transmission at 
EVERY frequency.  Having to absorb external components into the network 
may preclude the use of one topology or may restrict the range of Q.  A 
low pass PI network and a high pass Tee network can be made identical at 
only one frequency.

Larry, W0QE

Carl wrote:
> Ive used the T on a few conversions such as when I drove a low impedance 
> such as a 3 hole Alpha 76. The Pi is more forgiving when going from Eimac to 
> Chinese 3-500's as an example
>
> I also use a T on the 2M 3CX1000A7 and 222 8877 as the operating range is so 
> small its a set and forget and I wanted a high Q for selectivity to keep the 
> unwanted transverter products way down.
>
> Carl
> KM1H
>
>