George Cornelius wrote:
Channel Jumper wrote:
KRLD - operates with a effective radiated power of 50,000 watts.

[...]

Simple blocking circuit: a 365 pf variable capacitor and a 240
microhenry ferrite core inductor or coil

Rethinking...

I chose the standard tuned circuit components used in
the input stage of an AM radio over the years, but looking
closer I would guess that for a low impedence feed line
you would get better results - a sharper null - using a
smaller inductor and a larger capacitor.

So let's say we divide the inductance L of the
coil by 10.

For 1080 Khz, you need 1/sqrt(L C) = 2 pi f,
or C = 1/( 4 pi^2 f^2 L). This means you'll
need to tune C to about 900 pf for a 24 uh
coil. If you use a 365 pf variable C and add
750 pf or so in parallel to it, then, changing
to using this smaller coil, you should be able
to tune the null plus or minus a few hundred
Khz around the station frequency.

George Cornelius