[Henry] Classic 3K X Tuned input

[W5AMI]

I didn't think to look at the AL-1500, but you're right, turns only, which
does no one any good without diameter, TPI, etc.

I am at a loss as to why Henry used so much more inductance than needed.  I
have checked my inductance meter against a known source and it's accurate.
 If it comes down to it, I will remove enough turns to get it down where
it's in the range of the Berkeley calculations.

I might build up a breadboard pi network outside the amp with a 54 ohm
carbon resistor as a load, and try using my MFJ 259B to find a combination
of coil and caps to meet my expectations, then modify what's in the Henry
to the same.

Thanks for all the suggestions and help!

73
Brian / w5ami


On Wed, Mar 28, 2012 at 8:53 AM, hawley, charles j jr <c-hawley at illinois.edu
> wrote:

> He doesn't have the amp anymore, sold it, and can't remember what value
> the inductor was.
>
> However, he has used the Berkeley site for calculation and it worked for
> him. I would use those values.
> I was looking at the AL1500 schematic to see what they used, but they only
> show number of turns for the coil.
>
> It seems like the values you have might work better down in the cw portion
> of 80M.
>
> My friend does have a 3K-A which he has modified quite a bit, filament
> choke and put 160M into it. He likes that amp, did a lot of mods, but not
> much change of the input ckts on it.
> He just doubled the values of the 80M for the 160M added band that he
> added to the 80M position on the amp...and kept the 75M bandswitch
> position. He had to remove a jumper on the input ckt part of the switch to
> add the 160M input ckt.
>
> Chuck, KE9UW
> aka Jack, BMW Motorcycles
>
> --
Brian Sherrod - A.R.S. W5AMI
My website: "Arkansas Airwaves <http://arkansasairwaves.net>"
Committee - QWHA <http://menahamfest.org> (Queen Wilhelmina Hamfest
Assoctiation)
Arkansas Assistant Section Manager
ARRL Arkansas Official Observer Coordinator (OOC)
Section Website: ARRL Arkansas <http://ararrl.org>
Quarter Century Wireless Association (QCWA) #35737