Date: Fri, 12 May 2023 12:40:28 +0000 (UTC)
From: Bill Smith <ko4nrbs@yahoo.com>
To: "amps@contesting.com" <amps@contesting.com>
Subject: [Amps] HeathKit SB-220 Tank Circuit Inductance
<Has anyone measured the total?Tank Circuit inductance of the SB-220?? ?I
have read that it <needs to be doubled in order to use it for 160 meters.?
I used online Torrid Core calculators to <estimate it using the
recommendations in AG6K's article but 14 turns on a T-225-2 powdered iron
<core doesn't seem to be enough inductance.? Maybe I am missing
something.73 and thank <you,Bill KO4NR
## You require TWO of those T-225-2 cores. And each core is 1" thick.
With 2 x stacked, it should be 2" tall x 2.25" diam. Forget what the
wall thickness is on those cores.
## one core is good for 750 watts pep / cw. 2 x cores are good for 1.5
kw. 3 x cores are used for RTTY.
## you require TWO of em, to convert a SB-220 to 160m.
Jim VE7RF
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