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To create a 1:1 current choke balun using your coax feed line, simply wind 18
feet of your coax feed line (outside the radial field) evenly around a 4-inch round
form such as a PVC pipe. You can use zip lock cable ties to secure the windings
and to maintain the coil form. Additional information about constructing an
inexpensive 1:1 choke balun using your coax feedline can be found on-line at:
http://www.hamuniverse.com/balun.html.
For multi-band use, a 4:1 "unun" from Balun Designs is recommended at the
antenna feed point. A 4:1 unun helps lower the higher impedances presented by
the S9v on frequencies above 20 meters.
Balun Designs sells two 4:1 ununs specifically for the S9v, depending on the
amount of power you expect to run. These ununs may be purchased on-line at
www.balundesigns.com:
• If you are running 300 watts or less, use the Balun Designs "Model 4130sv
for S9 Vertical".
• If you running more than 300 watts, use the Balun Designs "4:1 Unun for
Verticals" (Model # 4134).
Up to 300W: Balun Designs 4:1
Unun for S9 Vertical
(Model 4130sv)
In a multi-band configuration, expect excellent results on 20 through 10 meters.
The antenna may be used on 6 meters provided your antenna tuner covers 6
meters.
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S9v 18' M k II Installation Guide
Above 300W: Balun Designs 4:1 Unun for
Verticals (Model 4134)
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