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SHUNT FEEDING A HUSTLER 40 METER MOBILE HF ANTENNA
BY KC8SGO  MARK
GET A BETTER MATCH AND A BIGGER SIGNAL!

"Well, it's not my invention by any means - comes from ARRL Antenna Handbook.
It's known as shunt feed, and is quite simple."

I use a Hustler MO-3 mast, and RM series resonators, on a ball mount off the left rear fender of the station wagon. I could not get a match below 1.7 to one  until I built this. Now I get 1:1 at my frequencies of interest and considerable useable bandwidth!      




The coil is 20 turns, #12 solid, 1 & 1/4 inch I.D. ( closet hanger dowel works great ) spread to 5" long, ( thats 4 turns per inch ).
One end to feed point, other to ground.
Clip lead from ground taps up the coil to adjust the inductance used. Eight turns works perfect for 40m, and 4 turns for 20m. Mind you, this is on a wagon - results will vary on a sedan. It works best on a ball mount on a fender, but can be adapted to other setups.


I have no camera for pictures for this page but if you get a
ARRL Antenna Handbook
, it's in the chapter on mobile antennas.

I love it!!!
- From 7.240 to 7.270 my SWR is below 1.5 to 1, and it's flat at 7.258 ( MIDCARS ). Perfect for the
1721 RTG (see link below) and all the other groups I hang with. On 20m, flat at 14.275 and I cover the entire general phone segment with SWR below 1.5 to 1.
I have yet to try 15m ( no resonator ) or 10m. I have an RM-10, just haven't gotten 'round to it.

Made a noticeable difference compared to the straight setup - both on TX and RX.
Hope this helps.

See ya on the 1721 RTG
CHECK OUT THE 1721 HF ROUNDTABLE GROUP

73
Mark
KC8SGO
HAVE A QUESTION? 
Email Mark Here






  


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