7VXR-7000 UHF Service Manual
Operating Manual Reprint
DC Power Supply Backup
For uninterrupted operation during power failures, a 12
volt rechargeable type battery (55-Ah or more recom-
mended) may be connected to the BATT terminal posts
on the rear panel. While the repeater is operating from the
AC source, a slight charging current will maintain battery
charge. In the event of an AC power outage, the auto-
matic power control circuit will automatically switch the
repeater to the backup battery, and operation will not be
interrupted.
After prolonged operation from the battery, it should be
disconnected from the repeater and recharged separately
before re-connecting, as the trickle charge is not suffi-
cient for recharging a completely discharged battery.
Never reapply AC power to the repeater with a discharged
battery connected, as the DC startup current can dam-
age the repeater and battery.
While operating from a battery or DC supply, the repeater
requires approximately 7 amperes at 12 Volts during trans-
mit.
Equipment Location
While the operating temperature range of the repeater is
quite broad, the best location is one in which the air tem-
perature does not approach the extremes of the specified
range, and one that does not change rapidly. Make sure to
allow for free air flow around the heatsink on the rear
apron at all times. In warm climates, the repeater should
not be sealed in a small closed room.
Protect the repeater from wind and rain, and ex-
tremes in temperature or humidity that may shorten
the useful life of the equipment. Try to locate the re-
peater in an environment that is also comfortable for
service personnel, if possible.
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