Butternut HF9V, Instructions Manual

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ASSEMBLY
53. Install coax 75 ohm matching (R) as shown placing the lug from the center
conductor over the screw on tube (B) and the braid over the screw on tube
w/insulator (A).
54. Place # 8 washers over each screw and install coil (Q) base matching. Secure
with washers, lock washers and hex nuts.
NOTE: Attach radials and ground to tube w/insulator (A) using the
remaining # 8 hardware.
WARNING: MAKE SURE THAT THE STATION EQUIPMENT IS
CONNECTED TO A GOOD EARTH GROUND! DO NOT HANDLE
CABLE CONNECTED TO STATION EQUIPMENT WITHOUT FIRST
DISCONNECTING THE EQUIPMENT FROM THE POWER MAINS.
YOU COULD BE ELECTROCUTED!
55. Connect coax 75 ohm matching (R) to any length of 50-53 ohm coaxial cable.
Connector PL258 (S) is provided. Seal the connection with the small roll of
Konnector-Kote.
CHECKOUT AND ADJUSTMENT
The dimensions and coil settings given above should produce reasonably low
VSWR readings over the entire 10, 15, 20 and 30 meter bands and over at least
250 kHz of the 40 Meter band. Bandwidth on 80/75 meters should be at least 30
kHz for VSWR of 2:1 or less at the low end of the band and may be as much as
100 kHz at the high end of the band, depending on the efficiency of the ground
system used, greater bandwidth being associated with lossy ground systems. It
should be remembered that on those bands where the physical height of a vertical
antenna is less than a quarter wavelength, the earth (or the resonant radial system
in above-ground installations) will have a good deal to do with VSWR and antenna
tuning, bandwidth and overall performance.
Low VSWR by itself does not mean that a vertical antenna is operating efficiently,
and if low VSWR is obtained with no more than the usual quick and dirty ground
connection, it most likely means the opposite. In general, poor operation or
improper tuning of vertical antennas can usually be attributed to inadequate (or
even reactive) ground systems or to other vertical conductors in the vicinity of the
antenna. For these reasons it is suggested that the antenna be placed as much in
the clear as possible and used with the best ground system that conditions permit.
For a more complete discussion of the interrelationships between vertical antenna
efficiency, bandwidth, VSWR, etc., a standard text such as the A.R.R.L. Antenna
Book is recommended. See also the material included at the end of these
instructions.