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Re: [Amps] AL-1200 Tuning Capacitor Range

To: "Kim Elmore" <>, <>
Subject: Re: [Amps] AL-1200 Tuning Capacitor Range
From: "Carl" <>
Date: Sat, 18 Oct 2014 11:59:48 -0400
List-post: <">>
If the tank is resonating at "almost" unmeshed and there are two resonance points as you continue the rotation youre fine, leave it alone.


----- Original Message ----- From: "Kim Elmore" <>
To: <>
Sent: Saturday, October 18, 2014 8:15 AM
Subject: Re: [Amps] AL-1200 Tuning Capacitor Range

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" <> 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
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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