Hi Joe, I started it when I asked the question about the use of a 4to1
torroid step down transformer in place of a coil and switch assembly for
the Pi-L. Many of the commercial ham amps use this method. The reason I
wanted to know is, I am rebuilding a TMC AM2103A RF deck. I have removed
the driver circuit and the dead PL172 and will use an 8877. This TMC amp
uses a PI network with vacuum variable caps and is built like a tank. To
convert it to a Pi-L network with a switched coil would be a lot of
work. I could easily put in a torroid transformer like the Commander and
ORO amps do, but I don't think it would be worth the trouble. By the way
I did not just take the extra test. Mr. Finkleman at the FCC gave me my
Extra and my Commercial exam. I was a young kid and was very nervous. On
the way home from the FCC office in downtown NYC I went over to Radio
Row to do some shopping for parts to build my first amp. Radio Row
became the site of the World Trade Center years later.
Regards to all, Jim K2ZO
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
On Behalf Of kk4tr
Sent: Thursday, March 29, 2007 5:14 PM
To: amps@contesting.com
Subject: [Amps] Pi L networks
Hello All
I see the great interest over the past week about the Pi-L network.
I was curious just exactly how this subject got started?? As
interesting as it is it does seems pretty straight forward?? It does
makes for better harmonic suppression without a doubt. Another thing
crossed my mind this week while reading this thread. Did someone just
finish taking the Amateur Extra Exam because that was one of the
questions on the test????? Hmmmmmmmmmmmmmmmmmmm very
interesting!!!!!!
Joe KK4TR
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