Section III. OPERATION UNDER UNUSUAL CONDITIONS

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.

System Intercom Operation. A

typical

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

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

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 .

particles on or in the equipment can damage parts or

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

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