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[AMPS] L-Net calculations: Am I doing something wrong?

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Subject: [AMPS] L-Net calculations: Am I doing something wrong?
From: (Merv Schweigert)
Date: Thu, 18 Feb 1999 10:43:47 -0600

Wow this amp project has gotten enough input to build
a dozen or so amps.   Lots of good info, some BS as
always etc.  
These discussions make me happy I am retired for one
thing, dont have to do this for a living any more. hi hi
I run several 4-1000 amps here for the past 30 years, 
they say it cant be done thats BS.. mine operate 160 
through 10 meters, full out put on all bands.  At 5KV
I can load to 800 ma no problem, out put on a bird is
over 2500 all bands.  No I dont use a B&W coil, they 
suck with a 4-1000.  just use home wound copper tube 
and wire for 160 meter coil.  input network is a pi-net.
Fooled with the other types of circuits and never could
get a broadbanded 1 to 1 match across the bands.
Use toroids and trimmers for the inputs, they work just
fine.  If you go 160 to 10 a shorting bandswitch is the
only way to go.  Cures many of those fireballs so common
with 4-1000 amps.   I dont ground to grids directly either
they are grounded through a low value wirewound resistor
and the resistor bypassed with several disc ceramics.
The parasitic plate lead is 3 turns nr 12 wire 1inch diameter
with no resistors across it.   Extremely stable amps and 
run all day long on RTTY at full bore,(with big enough blower).
So no I dont know all the formulas, dont know the Q of the 
input circuit, the tank circuit uses little over a PF per meter
as the oldtimers used to say.  Vacuum variable C1 and 
air variable on the output..   RJ1A  output relay and reed 
relay on the rf input.   Design engineer I am not, but at least
mine works.    73  Merv K9FD

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