SB-610 IF Freq

[Ed Richards]

I recently did this and it worked great!. I used an IF transformer from a
GR-64 parts radio and wired the primary as shown in the manual. Do not
use the 200 pF parallel capacitor as the IF can is self resonant at 455
kc. The can was the same size but mounted differently. I used some
SHO-GOO (my favorite good-for-everything glue) on all four sides. Solid
as a rock. To insure the can was grounded, I soldered a wire from one of
the mounting tabs to a chassis ground lug. Peaked right up with more than
enough signal to drive the trace off-screen.

Regards,
Ed Richards

On Sun, 23 Jul 2000 18:55:25 -0400 "Gerald C. Lemay" <wa1vwl at GROLEN.COM>
writes:
> A while ago, I took measurements of the various coils but I can't
> seem to loacte them at
> the moment. The SB-610 manual specifies 200pf to resonate the coil
> at 455KHz. That would
> mean the inductance value would have to be somehwere around 612uH.
> You might try a 455KHz
> IF transformer. It should work. This is not a critical part, so long
> as it resonates at
> the frequency of interest.
>
> 73/Gerry/W1ID

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