Vertex VX-1700, Руководство по эксплуатации

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Page 9
VX-1700 O
PERATING
M
ANUAL
Mobile Station Grounding
Although satisfactory grounding in most installations will
be achieved via the DC cable’s negative lead and the an-
tenna system’s coaxial cable shield, it may be necessary,
in some installations, to provide a direct ground connec-
tion at the mounting location of the transceiver. Due to
unexpected resonances which may naturally occur in any
location, improper communication system performance
may result from insufficient grounding. These symptoms
may include: RF feedback (resulting in distortion of your
transmitted signal), unintended scanning, blinking or
blanking of the frequency display, or loss of memory.
Note that these conditions may occur in any communica-
tions installation. The
VX-1700
includes extensive filter-
ing designed to minimize the chance of such problems;
however, random currents set up by insufficient RF
grounding can nullify such filtering. Bonding the rear panel
GND terminal of the VX-1700 transceiver to the vehicle
or vessel’s ground system should clear up any such diffi-
culties.
Vertex Standard does not recommend the use of “on glass”
mobile antennas unless the shield of the coaxial cable is
securely grounded near the feedpoint of the antenna. Such
antennas frequently are responsible for the ground-related
difficulties described above.
M
OBILE
M
OUNTING
I
NSTALLATION