[Amps] L networks in Amplifiers

2 2@vc.net
Thu, 16 Jan 2003 10:41:26 -0800

>	It seems to me that if you have a band switched   low pass  filter 
>following your impedance matching network the
>Q of the network is not so important. In fact a Q of 2 or 3 would be just 

Less Q means less Z transformation ratio.  A Q of 2.5 might be ok for a 
tube with a RL of 300-ohms and a 50-ohm antenna.  Eimac recommends 
aminimum Q of 10.

> It performs the matching requirement and the
>switched filter eliminates the harmonics. 

Compared to a Pi, harmonic reduction is typically 15db better for the 

>Is there anything I am missing 
>	Also, I have noticed that a few people don't realize that the capacitor to 
>ground goes on the Hi-z end of the
>network, the plate.
>Bill wa4lav
>Amps mailing list

-  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,