TM 11-6625-62212
power internally. The power requirements will
Nomenclature
common name
test. An internal rf load is provided for use as
Test Harness, Radio Set
Test harness
a dummy antenna. Included as part of the test
AN/URM-157
unit is Control, Radio Set C-3940 A R C - 9 4
Case Test Harness
Transit case
(Collins type 714E-3), which is mounted in the
CY-4064/URM-157
center of the front panel. The control unit
Test Harness Subassembly
Test unit
TS-1949/URM-157
indicates and controls operating frequency and
Adapter UG-201A/U
Adapter
controls the mode of operation and the sensi-
Cable Assembly, Special Purpose,
Cable W1
Electrical CX-8997/URM-157
Cable Assembly, Power, Electrical,
Cable W2
1-9. Description of Minor
Branched CX8998/URMl57
Components
Cable Assembly, Special Purpose,
Power cable
a. Transit Case (fig. 1-1). The transit case
Electrical CX-8999/URM-157
Cable Assembly, Special Purpose,
Cable W3
Electrical CX-9000/URM-157
with aluminum framework and hardware. It
Cable Assembly, Special Purpose,
Cable W4
provides a dustproof, portable enclosure for the
Electrical CX-9001/URM-157
equipment, with an air relief valve (not shown)
Cable Assembly, Special Purpose,
Cable W5
Electrical CX-9002/URM-157
for airborne transportation. The transit case is
Cable Assembly, Special Purpose,
Cable W6
composed of two parts. One half houses the
Electrical CX-9003/URM-157
test unit and a small bracket containing the
Cable Assembly, Special Purpose,
Cable W7
technical manuals. The other half contains a
Electrical CX-9004/URM-157
closed compartment. When the door to this
Cable Assembly, Special Purpose,
Cable W8
Electrical CX-9005/URM-157
half is opened, access is provided to a space
Cable Assembly, Special Purpose,
Cable W9
containing the test cables and adapters fur-
Electrical CX-9006/URM-157
nished with the equipment. The two halves are
Rf cable
fastened together by four twistlock clamps. A
CG-2727/U (5 ft, 0.1 in.)
dust cover, on the side of the lower half of the
Cable Assembly, Special Purpose,
Cable W10
transit case, when removed, provides access to
Electrical CX11045/URM-157
Cable Assembly, Special Purpose,
Cable W11
connectors on the rear panel of the test unit.
Electrical CX-11044/URM-157
b. Cables (fig, 13 and 14). Fourteen
cables
Control, Radio Set C-3940/ARC-94
Control unit
are provided as components of the test harness.
Cable Assembly, Special Purpose,
Cable W12
Each cable is identified by a metal band which
Electrical CX11046/URM-157
contains the short nomenclature. The following
is a description of the main cables and adapters:
1-8. Description of Test Harness
(1) Cable W1. Cable W1, is a 60-conduc-
Subassembly TS-1949/URM-157
tor, rubber-covered cable, 5 feet long,
with a 60-pin male connector on one
end and a 60-pin female connector on
Most of the operating controls and connectors
the other end.
are located on a sloping front surface panel
(2) C a b l e W 2 . C a b l e W 2 i s a f o u r - c o n -
and top panel for convenient operation. A
ductor, rubber-covered cable, 5 feet
d u m m y antenna input, an alternating cur-
long, with a four-pin female connector
rent (ac) convenience outlet, and a ground
on one end and two alligator clips on
jack are on the vertical rear panel. The test
the other end.
unit includes controls and connectors for use
in testing the Collins type 618T-1 and 618T-2
(3) Cable W3. Cable W3 is a 23-conductor,
transceivers. These equipments are not used by
rubber-covered cable, 5 feet, 2 inches
the U.S. Army and therefore test unit functions
long, with a 23-pin male connector on
applicable to these equipments are not covered
one end and a 23-pin female connector
in this manual. The test unit does not consume
on the other end.