Chapter 4. AUXILIARY EQUIPMENT

TM 11-5831-201-20

CHAPTER 4

AUXILIARY EQUIPMENT

Section I. GENERAL

frequency-modulated (f m) radio reception when

4-1. Introduction

a vhf, uhf, or hf radio transmitter is being used

a. This chapter describes Discriminator, Dis-

in the aircraft.

crete Signal MD736/A. The MD736/A is used

as auxiliary equipment in conjunction with the

4-3. Technical Characteristics

Control, Intercommunication Set C-1611D/AIC.

Input

Channels

4 (uhf, vhf, hf, and fm

b. This chapter covers functioning, operation,

radio).

organizational maintenance, cleaning, and inspec-

Power requirements

27.5 .5 vdc.

tion of equipment. Equipment that cannot be cor-

Dimensions:

rected at the organizational level must be removed

Height . . . . . . . . . . . . . . . . . 1 3/16 in.

from the aircraft and referred to higher category

Width . . . . . . . . . . . ....3 5/8 in.

of maintenance. Initial installation instructions

Depth . . . . . . . . . . . . .

are covered by the modification work order

5 5/16 in.

(MWO) applicable to the particular aircraft. Wir-

4-4. Description of Discriminator, Discrete

ing instructions to the interphone junction box

Signal MD-736/A

may vary from one aircraft to another. Configu-

ration manuals for the particular aircraft should

The MD736/A is a separately housed unit con-

be available for needed reference.

taining a printed circuit board protected by a

metal cover. Wire connections to the aircraft

4-2. Purpose and Use

interphone junction box are passed through a

a. Discriminator, Discrete Signal MD736/A

hole on one side of the MD736/A. Additional

provides filtering of the transmit audio signals

holes in the base of the metal housing provide for

from the very high frequency (vhf), ultra high

mounting the MD736/A to the inside wall of the

frequency (uhf), and high frequency (hf), radio

aircraft, or to the interphone junction box. There

signals that pass through the interphone systems

are no controls or indicators on the MD736/A

of military aircraft.

and the unit functions automatically when the

b. The MD736/A also functions to disable

aircraft radio equipment is activated.

TM 5831 20120-4

Figure 4-1. Discriminator, Discrete Signal MD-736/A.

4-1