Cdr700 Repeater; Battery Type; Battery Capacity - Motorola CDR500 Programming Manual

Battery Revert

Battery Type

cable as fused as close as possible to the con-
nection points to the battery. The fuse holders
must be insulated and have no exposed con-
tacts or wiring.
3. Connect the battery cable to the battery.
Observe proper polarity for the cable with
respect to the polarity of the terminals of the
battery. Above all else, work cautiously and
very carefully around a battery.
4. Plug the power cord from the CDR500
repeater into a suitable ac mains outlet. Fail-
ure to apply ac power before connecting the
battery cable will put the station on battery
operation and possibly result in totally dis-
charging the battery.
5. Attach the positive [+] wire from the battery
to the positive [+] pole on the two-conductor
barrier strip.
CAUTION
If you connect the negative [-] battery
wire before connecting the positive [+]
wire, shorts or severe damage can occur
if the positive wire comes into contact
with the CDR500 repeater housing or
any uninsulated metal connected to the
CDR500 repeater.
To prevent damage, connect the posi-
tive [+] wire before connecting the neg-
ative [-] wire.
6. Attach the negative [-] wire from the battery
to the negative [-] pole on the two-conductor
barrier strip.
7. Install the battery connector shroud.

CDR700 Repeater

1. The battery cable may be either a high power
mobile dc cable kit (such as the HKN9402) or
made by splicing 14-gauge (or larger)
stranded copper, insulation coated wire cable
to a 2-prong "Ford" connector. The positive
(+) lead from the battery must go to the insu-
lation coated contact of the "Ford" connector.
The splice joints must be covered with insulat-
ing shrink tubing or electrical tape.
2. Per the "Warning" on page 7-1, it is strongly
recommended that both leads of the battery
cable as fused as close as possible to the con-
nection points to the battery. The fuse holders
must be insulated and have no exposed con-
tacts or wiring.
3. Connect the battery cable to the battery.
Observe proper polarity for the cable with
respect to the polarity of the terminals of the
battery (the positive (+) lead from the battery
7-2
must go to the insulation coated contact of the
"Ford" connector).
4. Plug the power cord from the CDR700
repeater into a suitable ac mains outlet. Fail-
ure to apply ac power before connecting the
battery cable will put the station on battery
operation and possibly result in totally dis-
charging the battery.
5. Plug the battery cable into the charger cable
from the CDR700 battery revert module
Contacts on the battery connector are
live at all times while either the CDR500
or the CR700 repeater is attached to an
ac power source.
Keep the connector shroud for CDR500
repeater installed at all times.
Use electrical tape over the live (bare)
contacts of the HLN9455 battery revert
in the CDR700 repeater.
Battery Type
The back-up battery "bank" for the repeater consists of
one or more rechargeable batteries. The most readily
available batteries are the maintenance free solid gel
electrolyte lead-acid and nickle-cadmium (NiCd).
Whichever type you choose, the battery must be
designed for a service of operation that is typically spo-
radic and short term and may experience deep dis-
charging before recharging. In between discharging
periods, the battery must be capable of sustaining con-
tinuous, "float maintenance" charging at less than 1%
of the rated capacity. Batteries in this category are
called "stationary", "general purpose float and cyclic",
"deep cycle", or a similar term. Automotive batteries
are not designed for this service and should be
avoided.

Battery Capacity

To determine the capacity for the battery or battery
bank, you must know, or at least, estimate the longest
period of time that the repeater is expected to operate
on this back-up power source. Also, the percentages of
time the repeater is expected to transmit and receive/
standby must be factored in. Personal experience or
that of others may give you a close approximation. If
all else fails, assume a standard eight (8) hour shift
operating solely on the battery with an extra hour
before and another one after the shift. Ten (10) hours
makes the calculation easy. The transmit and receive/
standby times can be set equal (50% usage).
The capacity of the battery is rated in Ampere-hours
(Ah) and is called "C" or "1C". This is not to be con-
strued as the amount of current that may be drawn
from the battery in an hour of time. Typically, battery
6864110R66-O
CDR500 & CDR700 Repeater Service Manual
CAUTION
March, 2001