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S9v 18' M k II Installation Guide
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To create a mount for the S9v, simply install a U-bolt (not supplied) around the
fiberglass mast about 12" from the top of the mast. The S9v will slip over the
mast and rest on the u-bolt. You can then attach the four ¼-wave radials to the
u-bolt using ring terminal connectors. Then, attach your coax shield/unun ground
connection to the u-bolt. Do NOT run a wire from the u-bolt/coax shield/elevated
radials to an earth ground.
Radials
For optimum performance, the S9v should be used against a good RF ground. A
ground rod is not an effective RF ground! For an effective RF ground, use radial
wires constructed from 14 – 16 AWG stranded insulated copper wire.
For ground-mounted installations, use at least 16 radials (32 preferred), with
each radial at least 0.2 wavelength at the lowest operating frequency (14 MHz)
which is 13.37 feet (13 feet, 5 inches long).
There is no precise formula to calculate the length of ground-mounted radials
because everyone has different soil and soil tends to change the electrical length
of the radials. However, a general rule of thumb for radials is: "longer" and
"more" is better.
If you have the time and resources, 32 or more radials at least 13 feet, 5 inches
in length (or longer) should be considered. It is highly recommend that you use
a radial plate to connect and organize your radials.
The optional S9 Radial Plate has 36 radial mounting holes and includes 20 sets
of stainless steel hardware – enough to connect 40 radials to the plate.
Additional, detailed information on ground-mounted radials can be found on page
21.
S9 Radial Plate
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