[Amps] AL-1200 Tuning Capacitor Range

Carl km1h at jeremy.qozzy.com
Sat Oct 18 11:59:48 EDT 2014


If the tank is resonating at "almost" unmeshed and there are two resonance 
points as you continue the rotation youre fine, leave it alone.

Carl
KM1H


----- Original Message ----- 
From: "Kim Elmore" <cw_de_n5op at sbcglobal.net>
To: <amps at contesting.com>
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" <k6ll.dave at 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 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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