[Amps] Pi vs Pi-L

[Jim Kearman]

From: Theo Bellamy <theo.bellamy at spirittelecom.com>

> So, if Mr. Averageham wants to build an amp with a Pi network tank, and he
> uses a multi-band antenna, will using an antenna tuner between the amp and
> the antenna insure that his harmonics are sufficiently suppressed?

The ubiquitous t-network tuner with series capacitors and a shunt inductor (like the MFJs) is a high-pass filter, so it won't help a bit. The old Johnson Matchboxes with parallel-tuned inputs would probably do some good. The pi-L is the way of the future, and multi-section bandswitches will be a hot item.

73,

Jim, KR1S
http://kr1s.kearman.com/