FEEDING A HUSTLER 40 METER MOBILE HF ANTENNA
GET A BETTER MATCH AND A BIGGER
"Well, it's not my invention by any means - comes from ARRL
It's known as shunt feed, and is quite
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
interest and considerable useable
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.
no camera for pictures for this page but if you get a
Handbook, it's in the chapter on mobile
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
(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
I have yet to try 15m ( no resonator ) or 10m.
I have an RM-10, just haven't gotten 'round to
Made a noticeable
difference compared to the straight setup - both on TX and
See ya on the 1721 RTG
CHECK OUT THE 1721 HF
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