[Antennas] Interaction Between 40m Attic Dipole and Cable TV Coax

Wed, 05 Nov 2003 23:24:48 +0000

   My first thought is to break up the CATV cable with ferrite beads or
torrid cores, selected for the HF bands to be used.
   If there is no end available, cut the cable, slip on enough beads to make
each piece 8 or so feet long, put a "F" fitting on each cut end and a
double female between, tape the cores where you want them to keep them from 
being moved on you. (if someone picked up in the center of the cable the beads
would all slide to the two ends)

>   When the cable TV coax IS NOT connected to the splitter in the basement,
> my best SWR on 40m is 1.2:1 (not bad for an attic antenna!). However, when
> the cable TV coax IS connected to the splitter in the basement my best SWR
> moves up to 1.4:1 and the point of resonance (based on SWR dip) moves about
> 100kHz.
-- 
      73 (= Best Regards) de: (= from) Ron [email protected]
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