Topband: Re: core inductance and current

[K9AY]

I use 220 uH RF chokes rated at 0.5 amp DC current, with no problems.
They are solenoid-wound, single-layer on a ferrite core. I avoid larger
values and higher current ratings -- they usually have two layers of
windings, and the added capacitance lowers the self-resonant frequency.

Gary, K9AY



> Charlie N0TT wrote:
> >I have a remote switch that individually controls 6 relays through a
> >~1/4 mile long coax line that is used to switch receiving antennas.
> >For RF chokes in this device I use 73 mix binocular cores /.../
> >The indicated inductances with just *3-1/3 turns* on the 73 mix Binocular
>
> What would happen if I just use a common standard choke of something
> between 100 and 500 uH?
> Several remote circuits even suggest values up to 2.5 mH.
> I intend to use this for remote switching of beverage antennas primarily
> for the AM broadcast band, preferable also for the tropical shortwave
> broadcast bands. No transmitting anywhere around the listening post. Just
> listening.
>
> /Hermod Pedersen, Malmo, Sweden