Orderwire Assembly 1A13 Block Diagram Descriptions

TM 11-5820-695-35

resistor R10 makes FR FAIL signal logic 1 (fault). At the

input at U4A-1 (through U7B). Since the from radio

same time, U8E-12 changes to logic 0 and cuts off the

signal failed, there is no input at U4A-2 and no output.

monitoring circuits, and input to a speaker monitor, in-

2-7.

Orderwire Assembly 1A13 Block Diagram

band signaling at 1.6 kHz, a 1.1 kHz test tone, and

Descriptions

orderwire fault detection circuits (para 2-8, 2-9).

Orderwire assembly 1A13 is comprised of five daughter

Operational or maintenance activities between the

board assemblies (lA13A1-lA13A6) and chassis

distant radio station, Radio Set AN/GRC-144, and

mounted components. The daughter board assemblies

terminal equipment (through orderwire) are provided by

contain both discrete components (transistors, resistors,

a single orderwire channel operated on a party-line

etc.) and integrated circuits (IC's).

basis.

Orderwire assembly 1A13 provides duplex

telephone communication between the orderwire

2-8. Orderwire Assembly 1A13 Signal Distribution

stations by interconnecting signals from four different

Block Diagram Description (fig. 5-9)

sources. These four sources are Handset H-156/U,

Telephone Set TA-312/PT, the radio equipment

(transmitter orderwire output and recovered orderwire or

a. Duplex (transmit and receive) orderwire signal

orderwire, pcm bypass inputs), and the through

paths connecting the distant radio sta

orderwire (TO CABLE output and FROM CABLE input).

Orderwire assembly 1A13 also provides alarm

Change 6

2-24.15