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S9v 31' Installation Guide
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Radials
For optimum performance, the S9v should be used with an RF ground system
consisting of radial wires.
For ground-mounted installations, use at least 16 radials (32 preferred), with
each radial at least 0.2 wavelength at the lowest operating frequency (7 MHz)
which is 26.75 feet (26 feet, 9 inches long). A ground rod is not an effective RF
ground.
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" and "some" are better than "none". If you have the time and resources,
32 or more radials at least 26 feet, 9 inches in length (or longer) should be
considered.
It is highly recommend that you use ring terminal connectors and a radial plate to
connect and organize your radials. The optional S9 Radial Plate (or our PRO
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 19.
S9 Radial Plate
For elevated installations, use 4 radials, each ¼ wavelength at 7 MHz (33 feet,
5 inches long). Simply attach the 4 radials to the optional S9v Pipe Mount
Clamp below the base of the antenna and try to position the 4 radials
equidistantly around the S9v base. If possible, drop the radials away from the
S9v at a 45-degree angle to the base. Attach insulators to the ends of the
radials. Connect your coax shield to the clamp and radials. Do NOT run a wire
from the radials/clamp/coax shield to an earth ground.
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