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S9v 31' Installation Guide
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Configurations
When used with a proper ground system, the S9v is a serious 40 meter DX
antenna.
The natural resonant frequency of the S9v is just above the top of the 40 meter
band - around 7.4 MHz - and it is extremely broad-banded. Depending on your
RF ground system and proximity to nearby objects, the S9v may exhibit an SWR
well below 2:1 in the upper, SSB portion of the 40 meter band without an antenna
tuner.
So, if you operate a lot of SSB on 40, you may be able to use the S9v on 40
meters without using an antenna tuner. In this configuration, the coax feed line
can be directly connected to the S9v. Radials and a 1:1 choke balun are strongly
recommended, however. As a 40 meter monoband antenna, the S9v can be
mounted on the ground or as an elevated ground plane antenna on a pole, your
roof or a tower.
If you want to use the S9v as a 40 meter monoband vertical in the lower, CW
portion of the band and do not own (or want to use) an antenna tuner, consider
our optional 40 meter monoband conversion kit – please see our web site for
details. The monoband conversion kit is also useful if you want to phase two S9v
antennas on 40 meters for 3 to 4 dB of directional gain over a dipole.
Antenna Tuner
Internal rig tuners will easily tune the S9v anywhere on 40 meters. But if you
want to use the S9v as a multi-band antenna, you will need a quality 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 on bands above 40 meters.) For multi-band use, we recommend
the LDG Electronics series of auto tuners for use with the S9v. LDG tuners
easily handle the wide-range of impedances presented by the S9v over the
higher HF frequencies and also cover 6 meters.
Using a weatherproofed, remote antenna tuner at the antenna feed point ensures
absolute lowest signal loss and best overall multi-band performance. There are
several remote antenna tuners on the market. Some of these remote tuners
include u-bolts allowing them to be mounted directly onto the S9v base tube.
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