Rockwell Automation COLLINS MP-20, Operator'S Manual

Page: 7 / 26

7
Headset
A headset consisting of two earpieces, a boom microphone, a push to talk (ptt)
switch, a headband, and a coiled cord and plug.
Telegraph key
The telegraph key is adjustable in tension and gap, and has a 0.9-metre (3-foot)
flexible cord and plug. The key can be attached to the operator's thigh with a strap.
540L-1 battery cable
A 1.5-metre (5-foot) cable and a canvas bag, with an adjustable shoulder strap, that
allows the 612A-1 Battery to be carried under the operator’s outer clothing during
very cold weather.
938A-1 antenna
A dipole antenna that consists of two 35.67-metre (117-foot) braided wires wrapped
on individual plastic bobbins, that allow long-range communication. Each wire has
a 15.25-metre (50-foot) throwing line attached. The two wires are connected to a
center junction, which is connected to the receiver - transmitter with a 15.25-metre
(50-foot) antenna feeder cable.
Antenna counterpoise
Four 10-metre (32.8-foot) braided wires, wrapped on a plastic bobbin, are used to
provide a ground plane in low electrical conductivity areas. The four wires are
connected together at a center junction, which is connected to the receiver-
transmitter with a 1.8-metre (6-foot) cable.
510K-1 control extender
A 2-piece unit that allows the 377L-2 Receiver-Transmitter Control to be extended
for one-man operation of the receiver-transmitter while it is mounted on the
operator's back. The 377L-2 plugs into the part that clips onto the operator's belt.
The other part, connected through a cable, secures to the 671V-2 Receiver-
Transmitter.