Thanks, both. Had I given this more than passing thought at 11 PM, the answer
would have obvious!
Next chance I have, I'll see if I can spread out the turns a bit. I can't get
the cover off where it sits and It's a heavy beast so not much fun to move
around.
Kim N5OP
"People that make music together cannot be enemies, at least as long as the
music lasts." -- Paul Hindemith
> On Oct 18, 2014, at 0:05, "Dave Hachadorian" <k6ll.dave@gmail.com> wrote:
>
> 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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