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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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