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TM 32-5895-227-14&P
CU-872A/U.  Radio teletypewriter system reception is
3-4 OPERATING PROCEDURES. The using unit will
performed using Teletypewriter Set AN/TGC-14 and
operate the AN/MSQ-71 in accordance with local unit
Radio Receiver R-390A/ URR.
directives. Typical operations are presented below.
c.
System Intercom Operation. A
typical
a.
Operations  Group,  Systems  Operation.
system (figure 36) has single or multiple outstations. A
During systems operation, operators at operations group
single outstation, such as a MHBV-4 Radio Printer
positions may perform all independent operations. The
Control, has one Telephone Set TA-676/G wired directly
operators may also use their intercom facilities with
to a Connector Assembly MX-7142/G.  A multiple
respect to Telephone Set TA-676/G and Monitor Control
outstation, such as a MMBV-2 Van, has six Monitor
Panel SB-2600/G.
Control Panels SB-2600/G wired directly to a Connector
b.
Control Group, Systems Operation. During
Assembly MX-7143/G.  The AN/MSQ-71 system can
systems operation, all independent group operations can
accommodate four single and five multiple outstations.
be performed.  There are 35 independent outstation
intercommunication channels in the AN/MSQ-71. The
basic configuration provides 11 antenna input positions
to central station which may be distributed to 33
outstation receiver positions using Antenna Couplers
Section III. OPERATION UNDER UNUSUAL CONDITIONS
relative  humidity,  increases  condensation.
Dry
3-5  GENERAL. It may be necessary to operate the
equipment thoroughly at the first signs of moisture.
AN/ MSQ-71 under abnormal conditions, such as
c.
Operation in Desert Climates.
When
extreme cold, heat, humidity, moisture, or sand. A van
equipment is operated in desert climates, the main
housing,  when  used,  will  protect  personnel  and
problem is sand, dust, and dirt. Accumulations of these
equipment in temperatures ranging from -60to +160 .
F
particles on or in the equipment can damage parts or
a.
Operation in Arctic Climates.
Subzero
reduce efficiency. Take the following precautions:
temperatures and climatic conditions associated with
(1)
Hang wet sacks or other dust proof
subzero weather affect the efficient operation of the
material over doors and windows.
equipment. Instructions and precautions for operation
(2)
If available, a tent may be set up over
under these conditions follow.
the entire housing. Ensure that all tent walls are secure
(1)
Handle equipment carefully. Subzero
to prevent flapping in the wind. Never tie power cords,
temperatures cause equipment parts to become brittle,
interconnecting cables, or other wiring connections to
especially plastics and wire insulation.
any part of the tent. Desert areas are subject to sudden
(2)
Keep equipment as warm and dry as
wind squalls which can jerk the connections loose or
possible.  Maintain heat in the van housing.  Keep
break the lines.
equipment on for warmth, except when this overtaxes
(3)
Do  not  remove  panels,  chassis
the power source.
assemblies, or plug-in components unless absolutely
(3)
Keep a blackout curtain, a blanket, or
necessary. Clean all parts thoroughly before reinstalling
other similar heat barriers between the equipment and
them.
the entrance door.  This reduces heat loss and the
(4)
Keep the equipment as free from
danger of a cold draft striking heated equipment and
dust, sand, and dirt as possible. Particles mixed with oil
components.
or grease become grit, which can damage switches and
(4)
When cold equipment is exposed to
other  moving  parts.
Make  frequent  preventive
warm air, moisture will condense on the equipment. Dry
maintenance checks.
the equipment thoroughly if and when this occurs.
(5)
A sudden fall in temperature at night
Excessive moisture can cause operational failures.
often results in condensation on the equipment. Cover
b.
Operation in Tropical Climates. When the
the equipment with a tarpaulin or other similar material
equipment is operated in tropical climates, moisture is
to keep the condensation off of the equipment.
the problem again, especially when the equipment is
installed in underground dugouts or in swampy areas.
Ventilation is often very poor. This, combined with high
3-14

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