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S9v 43' Installation Guide
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Coax Cable
For top performance, the antenna should be fed with a high quality, low-loss 50
Ohm coaxial feed line such as RG-213 or LMR 400. Less expensive coax such
as RG-8x is also perfectly adequate for short coax runs of 50 feet or less.
Antenna Tuner
The S9v requires an antenna tuner in your shack or remotely located at the
antenna feed point. (Internal rig tuners do not have adequate range to match the
higher impedances presented by the antenna.)
Using a weatherproofed remote antenna tuner at the antenna feed point ensures
absolute lowest signal loss and best overall multi-band performance. When a
remote tuner is used at the antenna feedpoint, a 4:1 unun is typically not required.
However, a 1:1 current choke balun may be needed between the remote tuner
and your transmitter if you experience RF current in your shack. (Burying your
coax cable also helps minimize RF current from flowing back into your shack.)
The S9v 43' is surprisingly effective on 6 meters, assuming your tuner covers 6.
In casual testing, a ground mounted S9v 43' consistently outperformed a
monoband 6 meter Slim Jim elevated at 40 feet. You will enjoy good local 6
meter FM coverage plus the excitement of 6 meter DX when Sporadic E
propagation occurs on 6 meters.
4:1 Unun
A 4:1 "unun" is recommended at the antenna feed point (unless you are using a
remote antenna tuner). A 4:1 unun helps match the high impedance presented
by the antenna on some frequencies to your coax feed line. S9 strongly
recommends the Balun Designs "4:1 Unun for Verticals" (Model # 4134). This
unun has been rigorously tested with the S9v and offers excellent performance.
Optional 80 and 160 Meter Coils – The S9v 43' offers good performance on 80
meters when used with a 4:1 unun. However, if you are a serious 80 meter
operator, you should consider our optional 80 meter coil which improves the
efficiency of the S9v 43' on 80 meters. A coil for 160 meters is also available.
Please see our web site for more information on these optional coils.
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