[TowerTalk] 160 RX antenna. What kind of choke?

Richard (Rick) Karlquist richard at karlquist.com
Mon Dec 31 13:40:00 EST 2007

Colman Ahern wrote:
> Can you give some details about the choke which you added to the 
> feedline?  Ferrite mix, number of turns, size of core?  At my 
> receive-only location I have a very high level of RFI/EMI to deal with.
> Colman Ahern.
> Berkeley.

On the loop I recently mentioned, the feedline is coupled to
the loop matching circuit through a MiniCircuits T1-1 transformer.
This gives better feedline isolation that you can get with any
choke that I know of.  On the antenna side of the transformer,
there is a matching circuit from 50 ohms to whatever the loop
impedance is.

Rick N6RK

More information about the TowerTalk mailing list