Section II. DESCRIPTION AND DATA - TM-11-5821-285-12-10009

TM 11-5821-285-12-1

ment. Let us know why you don't like the design. Tell us

1-3. Maintenance Forms, Records, and Reports

why a procedure is hard to perform. Put it on an SF 368

Reports of Maintenance and Unsatisfactory

(Quality Deficiency Report). Mail it to Commander, US

Equipment.

Department of the Army forms and

Army Communications- Electronics Command and Fort

procedures used for equipment maintenance will be

Monmouth, ATTN: DRSEL-ME-MP, Fort Monmouth,

those prescribed by TM 38-750, The Army Maintenance

New Jersey 07703. We'll send you a reply.

Management System.

b. Report of Packaging and Handling Deficiencies. Fill

out and forward SF 364 (Report of Discrepancy (ROD))

1-5. Administrative Storage

prescribed

735-

11-2/DLAR

Administrative storage of equipment issued to and used

4140.55/NAVMATINST

4355.73/AFR

400-54/MCO

by Army activities will have preventive maintenance

4430.3E.

performed in accordance with the PMCS charts before

c. Discrepancy in Shipment Report (DISREP) (SF

storing.

When removing the equipment from

361). Fill out and forward Discrepancy in Shipment

administrative storage the PMCS should be performed to

assure operational readiness.

Report (DISREP) (SF 361) as prescribed in AR 55-

38/NAVSUPINST

4610.33B/AFR

75-18/MCO

P4610.19C/DLAR 4500.15.

1-6. Destruction of Army Electronics Materiel

Destruction of Army electronics materiel to prevent

1-4. Reporting Equipment Improvement

enemy use shall be in accordance with TM 750-244-2.

Recommendations (EIR) If your equipment needs

improvement, let us know. Send us an EIR. You, the

user, _are the only one who can tell us what you don't

like about your equip-

Section II. DESCRIPTION AND DATA

but frequency selection and encryption control can be

1-7. Purpose and Use

accomplished from only three stations.

a. Purpose .Communications Central AN/ASC-

(2) The VHF-FM links have voice encryption

15A(V)(*) is used to provide tactical commanders with

capabilities if the TSEC/KY-28 security equipment is

air-to-ground command and control communications in a

employed. The UHF-AM link cannot be voice encrypted.

battlefield environment.

In addition, it will provide

(3) Communications Central AN/ASC-15A- (V)(*)

ground-air- ground automatic secure retransmission

converts from the airborne command post mode to the

from an airborne platform.

automatic retransmission mode by changing the

b. Use.

appropriate cable connectors.

Retransmission is

(1) When installed in U-21 type aircraft, UH-1B,

accomplished by using the number 1 VHF-FM and

UH-1D or UH-1H helicopters, Communications Central

number 2 VHF-FM radio sets. Airborne retransmission

AN/ASC-15A(V)(*),configured in the command post

provides ground troops with a single secure or

mode, can be used as a forward area airborne command

nonsecure communications channel to other troops or

and observation post. This mode provides six separate

commanders.

Airborne retransmission becomes

intercommunications stations. Three of the six stations

necessary any time normal VHF communications are

have control of three separate very high frequency,

blocked or restricted. Some examples of restricted

frequency-modulated (VHF-FM) radio communications

communications during tactical situations are given

links, or two VHF-FM links, and one ultra high frequency,

below:

amplitude-modulated (UHF-AM) link. Each VHF-FM link

(a) Forward area troops desiring to communicate

consists of 920 different selectable channels in the

with rear area headquarters and the distance involved is

frequency range of 30 MHz to 75.95 MHz. The VHF-AM

too great for a reliable channel.

link consists of 7000 different selectable channels in the

(b) Troops in a mountainous terrain desiring to

frequency range of 225 MHz to 399.975 MHz.

communicate with a station blocked by hills or

Intercommunication or link transmission and reception

mountains.

can be accomplished from all six stations,

1-3