Reduce the inductance. This is usually most easily done by
spreading out the turns on the 21 MHz coil.
Dave Hachadorian, K6LL
Yuma, AZ
-----Original Message-----
From: Kim Elmore
Sent: Friday, October 17, 2014 9:43 PM
To: amps@contesting.com
Subject: [Amps] AL-1200 Tuning Capacitor Range
I have an AL-1200 that works very well using the 3CX1200A7 tube,
but at
the bottom end of 15 m the plate tune capacitor needs to be
almost
completely unmeshed for proper tuning. The load control is not
near
either extreme. I'm not completely convinced the PA is properly
tuned; I
figure this one has just a wee bit more stray capacitance. Would
moving
the 15 m tap one turn help this? If so, which way should I go:
remove a
turn or add a turn of inductance?
Kim N5OP
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