User's Manual

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7 Power supply, Optical fibres and

Communication cables

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7.1 Power supply

Each electronic component in the RAMAC/GPR system is

interchangeable between system components.

Rechargeable Ni-Cd or Pb-acid battery packs are available.

The capacity of the Ni-Cd packs is approximately 5.7 Ah. The

Pb-acid battery packs have an approximate 8 Ah capacity.

The operating time of the system is dependent on the charge

cycle history of the batteries. Normally, maximum operating

time is not reached until the batteries have been fully charged

and discharged 3-5 times. Optimum performance is achieved

through fully discharging and recharging the battery packs.

Note that batteries lose efficiency in cold temperatures. So

insulating the electronics and battery packs in cold climates

will prolong the battery life as the electronic units generate

internal heat during operation.

The batteries are mounted by simply placing the battery

compartment with the lid on the rear short side under the

corresponding groove in the electronic units. The front end or

the battery pack has a locking tab on the plastic housing.

Gently press on the front end of the battery until the lid is

released from the groove before removal.

A special empty battery pack for the CUII and unshielded

antennas is also available. It can hold six standard D-size-

cells. These can easily be replaced and are suitable when