[Lowfer] [600MRG] A wild day, but progress made reducing HDTV noise

[Carl]

Subject: [600MRG] A wild day, but progress made reducing HDTV noise


.. All well and good so far... I wondered
> about possible coax heating with the core so I ran my usual
> 10 watts into the antenna, and WHOAH NELLIE !!! The SWR was out
> the roof.. The ferrite core added LOTS of Inductance.. I don't
> know where the resonance went to, but I will say it's somewhere
> below 1.7 MHz.. waaaay below.. I'm assuming that to remedy this,
> all I will need to do is shorten the sides of the Windom and
> bring it back into 160 meters..

** Sounds like your coax outer shield is acting as part of the antenna 
instead of being decoupled at the feedpoint with a ferrite 
sleeve/choke/current balun. Having it the way it is now is just asking for 
common mode being picked up from all over the neighborhood.
I started working with ferrites in the late 70's and got into it heavy thru 
the 80's when working with the CIA's Tempest program at work.

Carl
KM1H