TM 55-1945-205-24-2
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UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
ROLL-ON/ROLL-OFF DISCHARGE FACILITY
THEORY OF OPERATION
SYSTEM OPERATION
The Roll-on/roll-off Discharge Facility (RRDF) is a floating discharge platform for ocean-going roll-on/roll-off
sealift vessels. The RRDF platform consists of an assembly of 153 non-powered floating modules. These modules are
assembled into five RRDF sections which are then connected together using the Navy flexor and shear connector
system which forms a hinge joint between them. The five RRDF sections are 80 ft long and of differing widths. The
width depends on the RRDF section’s location in the platform and on whether the RRDF platform will be used as the
side ramp or the stern ramp of the sealift vessel. The overall dimensions of the RRDF platform are 400 ft long by
120 ft wide. The platform is capable of supporting two M-1 Abrams tanks and one sealift vessel’s cargo ramp foot on
the platform surface. The structure of the RRDF will withstand the cargo loading through Sea State 2 conditions.
10 KW 0R 15 KW SKID MOUNTED TACTICAL QUIET GENERATOR
Refer to TM 9-6115-642-10 for the theory of operation of the 10 KW diesel generator set.
Refer to TM 9-6115-643-10 for the theory of operation of the 15 KW diesel generator set.
PERSONNEL SHELTER
The personnel shelter is contained in a 20 ft ISO container. Power is supplied to the shelter from the tactical quiet
generator through a power cable stored in the shelter and connected from a 100 amp connector on the backside of the
shelter to a 100 amp connector on the generator. The power provided by the generator supplies power to the electrical
distribution panel, which is cabled to the incinerator toilet, heating and cooling unit, lighting, fire suppression system
and to the GFI receptacles in the personnel shelter.
6 KW TRAILER MOUNTED LIGHT TOWER
The lighting system consists primarily of a self-contained, trailer mounted, 6 KW diesel generator which provides
6 KW of power at 60 Hz to four high pressure sodium, 1000 watt lamps. The power to each lamp is controlled by
individual switches on a control panel. The power is received from a 120 VAC - 2 phase alternator which is cabled
through two 25 amp circuit breakers, to the switches, to a ballast box and connected by quick disconnects to
the lights.
VHF/FM HANDHELD TRANSCEIVERS
The VHF/FM handheld transceiver is utilized for communicating between personnel during loading and unloading
operations on the RRDF. The transceiver has a frequency range of 156.025 to 163.275 mHz, plus 10 weather
channels. The transceiver has an RF power output with the CNB350 battery of 5.0 watts (high) and 1.0 watts (low).
The operating voltage is 7.2 volts DC. Current drain in standby mode is 40 mA, in receive mode 200 mA, in the
transmit mode 1.8 A (high power) and 0.7 A (low power). The battery life (5% Tx, 5% Rcv, 90% standby) is
approximately 10 hrs (high mode) and 15 hrs (low mode). The audio response is within +2/-8 of 6 dB/octave pre-
emphasis characteristic from 300 Hz to 3000 Hz. The AF harmonic distortion of the transmitter is 3%. The
transmitter has a hum and noise rating of 37 dB and a frequency stability (-20° to +50° C) of +/- 0.0005%. The
receiver has a sensitivity rating of 20 dB, quieting at 0.35 uv and 12 dB SINAD at 0.30 uv. The squelch sensitivity
(threshold) is 0.20 uv. Modulation acceptance bandwidth is +/- 4.5 kHz.
INCINERATOR TOILET
Refer to TM 55-1925-257-14&P for the theory of operation of the incinerator toilet.
