Mike and all: I just remembered I have an SB201 i;ve been working on, Just
that i haven't looked at it for so long, since i've been working on some
other amps for other people.
The 40 mtr. coil has 17 turns of the same size wire as the 80 mtr. coil.
which looks like about 22 ga... !! , and no I don't want your ten dollars..
!! donate it to charity or buy another six pack or whatever. Hi.! Hi. !
carl / kz5ca
----- Original Message -----
From: "Mike Baker" <k7ddmjb@qwest.net>
To: "AMPS REFLECTOR" <amps@contesting.com>
Sent: Saturday, November 02, 2002 11:17 AM
Subject: [Amps] SB-221 input network should have read SB-201/SB-200 input
network....etc
> Guess I should have waited until morning to type my request. Didn't
> remember what I was working on this time! ;>)
> To help reduce the confusion of my original post here is a bit of
> clarification.
>
> The alleged input impedance of 200 ohms was what someone told me the
it
> was for the tubes, not the amp itself.
> I didn't remove the ferrite core from the coil, I removed the ferrite
> core and windings from the housing it was in. (PVC pipe with a SO-239
> connector on one end and two hook eyes on the other.)
> I used a capacitor tester to measure the values of the caps before I
> installed the new ones and checked the value of the originals.
> The reason I am looking for a new coil is that when I removed the
filter
> unit from the SB-201 the input network that was in place didn't work
> anymore. I wanted to make it a bit higher Q than the original so it would
> match up to solid state exciters better so I took a look at the coil sets
in
> the SB-200 to see what the differences were. All the coil numbers were
the
> same except the 40 meter coil. I don't know what the differences are
> between them as I do not have the coil out of a SB-200 to make a
comparison
> with.
> DOES ANYONE HAVE THE ACTUAL WIRE SIZE AND NUMBER OF TURNS USED ON THE
> SB-200 40METER INPUT COIL!!!
> I'll SEND THE FIRST GUY WHO TAKES THE COVER OFF HIS AMP AND COUNTS THE
TURNS
> AND MEASURES THE WIRE SIZE $10 FOR HIS EFFORTS! I HATE REINVENTING THE
> WHEEL! ;>)
> I can see right now the thing I need to add to the shack test gear is
an
> LRC meter!!
> If I had one now I would take each of the coils out and measure the actual
> value of the inductors and their tuning range. It would be useful info to
> know for future efforts.
>
> Sorry for the long windedness. I should have been a novelist...... ;>)
>
> Best 73
>
> Mike Baker K7DD
> k7ddmjb@qwest.net
>
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