I thank you guys very much for all the help and ideas you gave me.
One thing I never thought about is he fact that you can put the choke in the
"cold end" of the pi tank; (my conservation instinct tells me to stay away of
that mod , :-), however it could be a way of solve one´s problem).
<...snip...>
> Anyway it is:
>
> 3 5/8" winding of #28 single Soldereze close wound on a 3/4" diameter
> ceramic form. I use the H.H.Smith #2621 which is a 4" long form..
> Series resonances as measured with a Measurements Model 59 GDO and 51J4
> receiver for readout accuracy are 15.9, 24.2 and 30.5 MHz . I have run
> well in excess of 1500W out on 10 and 12M in the AL-82 with no tuning or
> heating problems but I will admit to no testing in the FM wasteland above
> 29.0MHz.
>
<...snip...>
If your choke resonates only around 700khz from the 12M band and works fine,
then the behavior of my 3-500z on 15M has little to do with the choke
resonance , (hhmmm):
20% more Ip, 20% less Ig, over 13db gain than on other bands and brighter
color on the plate.
Hopefully this coming weekend I´ll have the time to work on the QSK (AG6K´s)
mod and will use the opportunity to remove some turns from the choke and try
to park it around 23.4Mhz which is right in between 10 and 12M.
> 73 Carl KM1H
> Amplifier Repairs and 6M Conversions Our Specialty
>
Thank You all again
73,
Hugo
CX9AAK/W2
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