Rockwell Automation COLLINS MP-20, Operator'S Manual

Page: 10 / 26

10
Cold weather configuration
During very cold weather, the 612A-1 Battery must be kept warm to obtain
sufficient mission time. The 540L-1 Battery Cable allows the 612A-1 Battery to be
removed from the 963A-1 Radio Set Harness and to be carried in a battery bag
under the operator's outer clothing.
Audio/keying option
The 719D-2A Receiver-Transmitter Group can be keyed by the H-189/GR Handset,
the headset, the telegraph key, or by a modem. All connections are made to one of
the two audio connectors on the 377L-2 Receiver-Transmitter Control.
Input power option
The 963A-1 Radio Set Harness is made to accept a second 612A-1 Battery, which is
latched beneath the operating 612A-l Battery. When the operating G12A-1 Battery
becomes discharged, it can be interchanged with the spare 612A-l Battery to provide
a total of 24 hours of operation.
For cases of isolated or extended missions, when recharged 612A-1 Batteries are not
available, the 886B-1 Generator is used to replenish the battery charge. It may be
used either when the 719D-2A Receiver-Transmitter Group is not being used or
when it is in operation. The 886B-1 Generator connects directly between the 719D-
2A Receiver-Transmitter Group and 612A-1 Battery on the 963A-l Radio Set
Harness, without the need for additional cables.
Antenna option
In dry or rocky terrain of low electrical conductivity, a counterpoise Is provided for
use with the whip antenna. The simple 4-wire counterpoise is laid out on the ground
and its center connected to the shell of the BNC connector on the 719D-2A Receiver-
Transmitter Group.
To accomplish extended range communications, a simple portable 93SA-1 Antenna
(dipole) is provided for use in place of the 2.4-metre (8-foot) whip antenna. Each leg
of the dipole has a nylon throw line for stringing the dipole between convenient trees
or other structures. The center of the dipole has a coaxial feed cable, which is
connected to the BNC connector on the 719D-2A Receiver-Transmitter Group. The
dipole may be erected either vertically or horizontally; horizontal erection
providing, the greater range.
A 637K-1 Antenna can be used with the 719D-2A Receiver-Transmitter Group. This
high-angle radiation antenna requires a base adapter.