Description of Cable Assemblies (fig. 1-11)

TM 11-5821-285-12-1

connect the cable to a U-94A/U connector. The other

toward the rear.

All cables use the BNC type of

plug is for connection to the aircraft communication

connector.

system. The jack is for connection to the aircraft pilot or

(2) UHF-AM rf cable assembly, is a single cable

copilot/observer headset- microphone.

approximately 35 feet long transfers rf energy to and

c. KY-28/TSEC. To operate the FM radios in the

from the UHF/VHF antenna connector on the console to

Antenna AT-450. This cable must be connected when

cipher mode, one KY-28 crypto box must be in- stalled

either the ARC-164 or the my ARC-51BX radio sets are

for each FM radio that is to operate in the cipher mode.

used.

In the secure retransmission mode, one KY-28 must be

b. Cable Couplers. Three control cables for

installed in the number 1 location if the operator desires

couplers FM-1, FM-2 and FM-3 radios are provided. FM-

to monitor the secure retransmission message traffic.

1 and FM-2 control cables are each 9 feet long and FM-3

Otherwise, secure retransmission may take place without

any KY-28. C HYL-3/TSEC. To regenerate secure

control cable is 20 feet long. Each cable is made up of

nine-conductor CO-12LOF(12-22)0325 cable, terminated

retransmissions, one HYL-3/TSEC must be installed.

at the ends with type PT06A-12-1OS(SR), and

PT06A1210P(SR) connectors. The FM-1 and FM-2

1-13. Description of Cable Assemblies (fig. 1-11)

control cables are required if Antenna Coupler CU-

a VHF-FM Radio Frequency Cable Assembly. (1)

942B/ARC-54 is used. However, if Antenna Coupler CU-

Three RG-58/U cables are provided to transfer rf energy

2206/ARC is used, the cables are not required.

to and from the FM-1, FM-2 and FM-3 antenna ports to

(Antenna coupler CU-2206/ARC may be substituted for

the respective coaxial antenna ports on the front. Two of

CU-942B/ARC-54 at anytime.)

the cables are each 9 feet long. They connect FM-1 and

c. Power Cable Assembly. The power cable

FM-2 radios to their respective antenna couplers located

assembly is 15 feet long. It is made up of 15 feet of two-

on the forward portion of each helicopter skid. The third

conductor No. 2 AWG CO-212 cable terminated at one

rf cable is 20 feet long and connects FM-3 radio to

end with connector 164-201-1S(17). The other end has

antenna coupler 3 located underneath the helicopter

the rubber cover cut back and each conductor is

terminated with lugs.

1-16