[Amps] AL-1200 Tuning Capacitor Range

[Dave Hachadorian]

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 at 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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