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I
NSTALLATION
Antenna Considerations
Repeater operation requires two antennas, one for re-
ceiving and one for transmitting, so that the receiving
antenna does not absorb energy from the transmitting
antenna. There are a number of ways to do this, depend-
ing on the TX/RX frequency separation, and on the lo-
cations available for antenna mounting.
Regardless of the above choice, it is of paramount im-
portance that the antenna(s) be mounted as high and in
the clear as possible, preferably within line-of-sight to
all repeater users. Furthermore, losses in the feedline(s)
must be minimized, so the feedline(s) should be high
quality, and as short as possible. If a long feedline is
necessary, use coaxial "hardline" cable to reduce losses.
Repeater antennas should have an impedance of 50 Ω
at the operating frequency. When separate receive and
transmit antennas are used, high-Q narrow-band types
may serve to minimize interaction.
NEVER TRANSMIT WITHOUT HAVING A
TRANSMIT ANTENNA CONNECTED TO THE
TX ANTENNA JACK OF THE REPEATER.
Page 4
VXR-9000V-H / VXR-9000U-H FM R
Equipment Location
The VXR-9000x-H must be installed in a 19-inch Mount-
ing Rack, which will allow for free air flow around the
heat sink of the 100 W PA Unit at all times. In warm
climates, the repeater should not be sealed in a small,
closed room without air conditioning.
While the operating temperature range of the VXR-
9000x-H is quite broad, the best location is one in which
the air temperature does not approach the extremes of
the specified range, and one that does not change rap-
idly.
Protect the VXR-9000x-H (Mounting Rack) from wind
and rain, and extremes in temperature or humidity that
may shorten the useful life of the equipment. Try to lo-
cate the VXR-9000x-H (Mounting Rack) in an environ-
ment that is also comfortable for service personnel, if
possible.
EPEATER
O
M
PERATING
ANUAL
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