Category: SSIC 02000 Telecommunications
Updated: 06/24/96
Number: MCO 2308.3
Subj: ALO ON THE COMM SYS, AN/TSC-95

DEPARTMENT OF THE NAVY
HEADQUARTERS UNITED STATES MARINE CORPS
WASHINGTON, DC 20380-0001
MCO 2308.3
LMC-1/107-db
13 Apr 1984


MARINE CORPS ORDER 2308.3 W/CH 1

From: Commandant of the Marine Corps
To: Distribution List

Subj: Advance Logistics Order on the Communications System,
AN/TSC-95

Ref: (a) MCO P4400.82E
(b) MCO 4400.32C
(c) MCO 4105.1A

Encl: (1) Logistics Data, Publications, and Allowances for the
Communications System, AN/TSC-95


1. Purpose. To disseminate logistics information to
commanders concerning the introduction of Communication System,
AN/TSC-95. Additionally, this Order constitutes authority to
place this equipment in service.

2. Background. The Communications System, AN/TSC-95
(hereinafter referred to as AN/TSC-95), is intended to provide
the Force commander with the means to effect a Fleet Marine
Force (FMF) mobile command termination with a naval
communications station. The AN/TSC-95 has the capability of
terminating two high frequency communication links operating in
a full-duplex mode. These links can be either teletype, secure
teletype, voice, or any combination thereof.

3. Information

a. General. Fourteen AN/TSC-95's have been fabricated by
the depot maintenance activity (DMA), Barstow, California,
under the direction of the Naval Electronics Systems
Engineering Center, San Diego, California. This procurement
comprises the total inventory objective for this item.

b. Description. The AN/TSC-95 consists of a High
Frequency Communications Central, AN/TRC-171, and a
Teletypewriter Central, AN/TGC-46, together with necessary
antennas and ancillary equipment. The system is housed in two
S-280 shelters, which are helicopter transportable or which can
be mounted on a standard USMC 5-ton truck. The system does not
require a dedicated prime mover. It must be displaced by Helo
or truck prior to operation. Two 15-kilowatt (kW), 60-hertz
(hz), generators not supplied as part of the AN/TSC-95, are
required to power the system. The AN/TRC-171 and AN/TGC-46 are


PCN 102 029113 00




capable of being operated as independent systems. When
operated alone, the AN/TRC-171 is capable of establishing the
high frequency communication links in the voice mode only,
since it contains no record terminal equipment. The AN/TGC-46
can be operated as an independent teletypewriter terminal;
however, transmission paths must be provided by other means.

c. Technical Characteristics

(1) High Frequency Communications Central, AN/TRC-171

Function Characteristics

Transmit

AN/URT-23B(V):

Frequency Range 2.0 to 29.999 megahertz (MHz) in 100 Hz
steps (280,000 channels).

Modes of Operation Upper side band (USB), lower side band
(LSB), independent side band (ISB),
radio teletype (RATT), independent side
band radio teletype (ISB RATT) (RATT on
USB, voice on LSB), continuous wave
(CW), and compatible amplitude
modulation (AM).

Power Output 1 kW peak emitted power (PEP) for LSB,
ISB, and USB, and compatible AM (250
watts of carrier) emissions; 1 kW of
average power for CW and RATT
emissions.

Power Source 208 volts, alternate current (Vac), 60
Hz 3 phase. 115 Vac, 400 Hz 3 phase.

Power Consumption 4,500 watts maximum.

Power Factor 0.8 minimum.


2


Function Characteristics

Transmit

Frequency Control Synthesizer referenced to 5 MHz
internal or external frequency
standard.

IM Distortion -33 decibel (dB) maximum at 100 watts
output.

Carrier Suppression 50 dB.

Harmonic Suppression 45 dB.

Ambient Temperature 0 to 50C to operate -50 to +75C
Range storage.

32 to 122F to operate -58 to +164F
storage.

Humidity 0 to 95 percent.

Heat Dissipation 3,500 watts maximum.

Receive

R-1051 F/URR:

Frequency Range 2.0 to 29.0000 MHz in 0.1 kilohertz
(kHz) increments.

Receiver Type Superheterodyne (triple conversion).

Frequency Stability 1 part in 10(8) per day.

Frequency Accuracy 0.5 Hz at 5MHz.

Frequency Control Crystal controlled synthesizer
referenced to a 5 MHz internal or
external standard; 0.2 volt minimum
input.

Modes of Operation LSB, USB, ISB, AM, CW frequency shelf
keying (FSK), and voice-frequency
carrier telegraphy (VFCT).

Sensitivity 1 micro (u) volt for 10 dB in single
side bond (SSB); 2 u volts in CW, FSK,
and VFCT modes; and 4 u volts in AM
mode.


3


Function Characteristics

Receive

Receiver Intermediate First, 20 or 30 MHz; second, 2.85
Frequency (IF) MHz; third, 500 kHz.

Bandwidth SSB, 3.2 kHz; AM and CW 7 kHz.

Antenna Impedance 50 ohms.

Ambient Temperature 0 to 50C or 32 to 122F.

Power Consumption 55 watts.

Power Requirement 115 Vac 10 percent single phase 48
to 450 Hz.

I.F. Rejection -75 dB.

Image Rejection -80 dB.

(2) Teletypewriter Central, AN/TGC-46

Function Characteristics

Telegraph Terminal

AN/UCC-1D(V):

Keying Rate Narrow Band Channel 75 bauds
(nominal)

Wide Band Channel 150 bauds
(nominal)

Frequency Stability 0.5 Hz for both mark and space
frequencies on all channels.

Telegraph Loops Types of signals

Receive Loops: Neutral or Polar

Send Loops: Neutral or Polar

Loop current requirements

Neutral (HI): 20 to 60 master (ma)

Polar (LO): 6.0 volts, direct
current (Vdc)


4


Function Characteristics

Telegraph Terminal

AN/UCC-ID (V):

Loop battery

Neutral: 30-130 Vdc
supplied from
external loop

Polar: 6 to 7 Vdc
supplied from
external loop

Power Requirements 115/230 Vac 10 percent, 50-60 Hz
5 percent, single phase

Power Consumption Keyer 9 watts
Converter 5.5 watts

Control Attenuator 5 watts
Test Set 10 watts

(3) Teletypewriters, AN/UGC-77, AN/UGR-9, AN/UGC-48A,
TT-603/UG, and TT-605/UG

Function Characteristics

Input Voltage 115 Vac, 60 Hz, single phase

Input Current Starting: 9 amps
Running: 1.9 amps

Power Output 1/20 hp at 3,600 revolution per
minute (r/min)

Power Consumption 65 watts

Heat Dissipation 50 watts

Protection Thermal Cutout

Code Baudot (five units start-stop);
sequential

Input Neutral: Selector magnets directly
connected to signal line,
or through line relay

Polar: Line relay or selector
magnet driver required


5


Function Characteristics

Line Current 20, 30, or 60 ma

Power Requirements Synchronous Motor: 115 Vac-10 percent
60 Hz .75% Hz, single phase

Governed Motor: 115 Vac+10 percent,
50-60 Hz, single phase

115 Vdc with external resistance

Patch Panels

DC Red SB-3189B/FGC 1. Transmit: Patches TTY channel A
and/or B signal from TTY to
TSEC/KW-7 Crypto Security
Device.

2. Receive: Patches receive
signal from TSEC/KW-7 Crypto
Security Device to TTY channel
A and/or B.

DC Black SB-4034/UGQ 1. Transmit: Patches TTY channel
A and/or B from TSEC/KW-7 Crypto
Security Device to AN/UCC-ID

2. Receive: Patches receive audio
from AN/UCC-ID Converter to
TSEC/KW-7 Crypto Security
Device.

Input Power Field: 208 Vac, 4-wire wye
Shipboard: 440 Vac, 3-wire delta

d. Replaced Item. None.

e. Concept of Employment. The mission of the AN/TSC-95 is
to provide the landing force with an independent means of
exchanging operational and administrative traffic between the
landing force and commands outside the objective area. In
particular, it will provide access to the worldwide Defense
Communication System (DCS) through a naval communications
station (NAVCOMMSTA) termination. In a Marine amphibious force
operation, it is planned to assign four AN/TSC-95's to the
communications support company (CSC) of each of the
communications' battalions. One AN/TSC-95 would be provided by
the CSC to the senior Marine air-ground task force (MAGTF)


6


commander for effecting an FMF mobile command net termination
upon establishment of the landing force command ashore. The
remaining AN/TSC-95's would provide similar long-distance
terminations for division, wing, and service support group
headquarters as required.

f. Allowances. Authorized allowances for the Communication
System, AN/TSC-95, are listed in the enclosure.

g. Priority of Issue. The AN/TSC-95 will be issued in
accordance with the enclosure.

h. Maintenance Responsibility

(1) Organizational Maintenance

(a) First echelon maintenance shall be performed by
the equipment operator of the using unit. It shall include
proper care, use, operation, inspection, cleaning, and general
preventive maintenance prescribed in the applicable stocklists
and technical manuals.

(b) Second echelon maintenance shall be performed
by the communication electronic maintenance platoon,
headquarters company, communication battalion. It shall
include servicing and scheduled maintenance. Testing is to be
performed as outlined in the applicable technical manuals.

(2) Intermediate Maintenance

(a) Third echelon maintenance shall be performed
by the maintenance personnel of the communication battalion.
Maintenance shall be as prescribed in the applicable stocklists
and technical manuals.

(b) Fourth echelon maintenance shall be performed
by the maintenance personnel of the electronic maintenance
company, force service support group (FSSG), in accordance with
established procedures.

(3) Depot Maintenance. Fifth echelon depot maintenance
functions shall be performed at the Marine Corps logistics
bases.

(4) Rebuild. Rehabilitation of the complete AN/TSC-95
is estimated to be accomplished on the following schedule:

Combat environment 36 months
Communications-electronic 48 months
Noncombat 60 months


7


i. Personnel Requirements

(1) Operation. The AN/TSC-95 will be operated by
personnel currently available within the FMF.

(a) For operation of the AN/TRC-171, Military
Occupational Specialties (MOS's) 2549 and 2534, Communication
Center Chief and High Frequency Communication Central
Operator.

(b) For operation of the AN/TGC-4C, MOS 2542,
Communication Central Operator.

(2) Maintenance. The requirements for maintenance
support on the organizational and intermediate levels are as
follows:

(a) One Ground Radio Repairer MOS 2841, or Radio
Technician, MOS 2861, for repair of the AN/TRC-171.

(b) One Teletype Technician MOS 2818, or KG-13
Teletype Technician, MOS 2819, for repair of the AN/TGC-46.

(c) One Engineer Equipment Mechanic, MOS 1341.

(d) One Electrical Equipment Repair Specialist,
MOS 1142.

j. Training. Operator training will be accomplished by
incorporating the AN/TSC-95 into the High Frequency
Communications Central Operator Course conducted by the Marine
Corps Communications Electronics School and by on-the-job
training. Navy maintenance courses conducted by the Naval
Fleet Training Centers (Norfolk and San Diego) will be used for
obtaining skills in maintenance of component items AN/UCC-1 and
AN/URT-23. Maintenance and repair instructions necessary to
conduct first through fourth echelon maintenance are contained
in the technical publications listed in the enclosure.

k. Support Concept. The AN/TSC-95 shall be logistically
supported in accordance with the echelons of maintenance as
prescribed in the technical publications listed in the
enclosure.

l. Repair Parts Support. Repair parts support will be
obtained through the Marine Corps Supply System on a critical low
density, combat essential basis. Critical low density initial
issue applies. The master provisioning project code for the end
item is F4M, with associated Project Codes F5I, F5Q, F6P, F6Y,
F7B, F7D, F7G, F7J, F7X, and F8P applicable. The percentage of
supportability considered adequate for initial issue is 95
percent.


8


m. Special Tools. No special tools are required above
those presently allowed by the organization's tables of
equipment.

n. Special Test Equipment. No special test equipment is
required beyond that standard equipment currently authorized at
requisite echelons.

o. Recoverability. The AN/TSC-95 is recoverable at fifth
echelon and will be rebuilt. It is reportable under the
provisions of reference (a).

p. Logistics Planning Data. Logistics planning data for
the AN/TSC-95 is provided in the enclosure.

q. Action

(1) The Commanding General, Marine Corps Logistics
Base (MCLB), Albany, will direct shipment of the prescribed
allowances in accordance with the priority of issue shown in
the enclosure when directed by the Commandant of the Marine
Corps (CMC).

(2) Upon receipt, the equipment will be placed on
administrative deadline until the actions prescribed in
reference (b), paragraph 7a, have been accomplished.

(3) The Commanding General, FMF's, Atlantic and
Pacific, will report the date the items are placed in service
to the CMC (Code LMC) and the Commanding General, MCLB,
Albany.

(4) Upon the establishment of the initial operational
capability (IOC) within the FMF, the Commanding General, MCLB,
Albany, will assume the logistics support responsibilities of
the end item in accordance with reference (c).

4. Reserve Applicability. This Order is not applicable to the
Marine Corps Reserve.


W. G. CARSON, JR.
By direction

DISTRIBUTION: BMA

Copy to: 7000045 (10)
7000062, 106, 144, 148, 160/8145001 (1)


9


DEPARTMENT OF THE NAVY
HEADQUARTERS UNITED STATES MARINE CORPS
WASHINGTON, DC 20380-0001
MCO 2308.3 Ch 1
LMC-1-db
3 Aug 1984


MARINE CORPS ORDER 2308.3 Ch 1

From: Commandant of the Marine Corps
To: Distribution List

Subj: Advance Logistics Order on the Communications System,
AN/TSC-95

Encl: (1) New page inserts to MCO 2308.3

1. Purpose. To transmit page inserts to the basic Order.

2. Action. Remove present pages 1 through 3 of enclosure
(1) to the basic Order and replace with new pages 1 through 3
contained in the enclosure hereto.

3. Change Notation. Paragraphs denoted by an asterisk (*)
symbol contain changes not previously published.


W. G. CARSON Jr.
by direction

DISTRIBUTION: BMA

Copy to: 7000045 (10)
7000062, 106, 144, 148, 160/8145001 (1)


PCN 102 028435 01


11


LOGISTICS DATA, PUBLICATIONS, AND ALLOWANCES
FOR THE COMMUNICATIONS SYSTEM, AN/TSC-95


1. Logistics Data

Item name: Communications System, AN/TSC-95

TAM Nos.: A0288 Comm Sys, AN/TSC-95

A0305 Comm Ctrl, AN/TRC-171

A2645 TTY Ctrl, AN/TGC-46

ID No.: 08059A Comm Sys, AN/TSC-95

NSN: 5895-01-132-4586, AN/TRC-171

5815-01-132-4562, AN/TGC-46

Unit of issue: each

Unit cost: $650,000

Unit standard package: 1

Stores account code: 3

Square: AN/TSC-95: 179 ft(2) (16.5m(2))

AN/TRC-171: 89 ft(2) (8.25m(2))

AN/TGC-46: 89 ft(2) (8.25m(2))

Cube: AN/TSC-95: 1,226 ft(3) (135m(3))

AN/TRC-171: 613 ft(3) (17.5m(3))

AN/TGC-46: 613 ft(3) (17.5m(3))

Weight: 10,500 pounds total

Replacement factors: N/A


ENCLOSURE (1)
Ch 1 (3 Aug 1984)
1


2. Allowances

T/E No. Unit Qty.

7011 MCLB, Barstow 1

7014 MCLB, Albany 1

* N-4012 CommCo, CommBn, 1stMAF 4

N-4024 CommSptCo, CommBn, 2dMarDiv 4

* N-4032 CommCo, CommBn, 3dMAF 4

3. Priority of issue. Initial systems are to be shipped in
accordance with the following priority of issue.

a. II MAF.

b. I MAF.

c. III MAF.

d. Depot.

4. Publications

Publication No. Title PCN

TM-5815-14/1 Installation, Operation, 182 051000 00
and Maintenance Manual
Teletypewriter Central,
AN/TGC-46

TM-5895-14/1 Operation, Maintenance 182 058240 00
and Installation
Instructions,
Communication Central
AN/TRC-171

TM-08059A-12 Operation/Maintenance 184 079513 00
Installation Instructions
Communication Set,
AN/TSC-95

NAVELEX
0967-LP-613-5010 Teletypewriter Set, 207 013460 00
Model 28

ENCLOSURE (1)
Ch 1 (3 Aug 1984)
2


Publication No. Title PCN

NAVELEX CHOOA, Teletypewriter 207 013460 50
Set, Model 28

N/A Modem Digital Data, 500 001460 00
MD-1061 (V)/USC

SL-3-07508A Antenna, AS 2259/GR 123 075080 00

*SL-4-07508A Antenna, AS 2259/GR 124 075080 00

NAVSHIPS:
0967-LP-173-6010 Teletypewriter Set, 207 014797 00

0967-LP-173-6020 Model 28 Send/Receive 207 014798 00

0967-LP-173-6030 207 014799 00

0967-LP-173-6040 207 014800 00

0967-LP-173-6050 207 014810 00

0967-LP-173-6060 207 014820 00

SL-4-07718A Converter-Repeater, 124 077180 00

CV-2757/SGC 124 077180 01

NAVELEX:
0967-LP-425 8010 Converter-Repeater, 207 015073 00
CV-2757/SGC

NAVFLEX
0967-LP-173-8020 Transmitter Distributor, 207 014842 00

0967-LP-173-8030 Model 28, TT-605/UG 207 014843 00

0967-LP-173-9010 207 014846 00

0967-LP-173-9020 207 014846 00

0967-LP-173-9030 207 014848 00

NAVELEX
0967-391-6010 Patch Panel, Red, 207 015068 00
SB-3189A/FGC

NAVELEX
0967-034-9010 Comparator Converter 207 012620 00
Group, AN/URA-17

ENCLOSURE (1)
Ch 1 (3 Aug 1984)
3