Wayne,
You are not using a toroid, right?
73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie
-----Original Message-----
From: Wayne Rogers
Sent: Thursday, January 19, 2012 9:30 AM
To: amps@contesting.com
Subject: [Amps] Pi Network Coil Design
I'm working on the design of the Pi network for a 4-1000A linear (160, 80,
40 and 20 M only), plate resistance is 5500 ohms,
The inductance for 160M is 39.2 uH. I'm planning on using a ceramic former
3.5" by 6.5" (31 T #10 Thermaleze spaced over 6").
That part is easy. I have a couple questions about taping the coil for the
higher bands. For 80M the inductance required is 19.6 uH, half the 160M
value. So I assume that if I tap the coil at the 50% point I'll have 19.6
uH. Do I need to give any consideration for the end effect of the shorted
out portion of the coil? Whatever the answer I assume it will apply for the
higher bands (40 and 20).
Thanks guys and 73, Wayne N1WR
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