Table of Contents
Advertisement
Antenna Considerations
Repeater operation requires two antennas, one for
receiving and one for transmitting, so that the receiv-
ing antenna does not absorb energy from the trans-
mitting antenna. There are a number of ways to do
this, depending on the TX/RX frequency separation,
and on the locations available for antenna mounting.
Regardless of the above choice, it is of paramount
importance 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
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 RE-
PEATER.
VXR-9000E FM R
O
EpEatER
pERating
Equipment Location
The VXR-9000E must be installed in a 19-inch
Mounting Rack, which will allow for free air flow
around the heat sink on the rear apron 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-
9000E is quite broad, the best location is one in
which the air temperature does not approach the ex-
tremes of the specified range, and one that does not
change rapidly.
Protect the VXR-9000E (Mounting Rack) from wind
and rain, and extremes in temperature or humidity
that may shorten the useful life of the equipment.
Try to locate the VXR-9000E (Mounting Rack) in an
environment that is also comfortable for service per-
sonnel, if possible.
M
anual
Installation
9
Advertisement
Table of Contents
