Orderwire Assembly 1A13 Signal Distribution Block Diagram Description-continued

TM 11-5820-695-35

1A15A8. When the RING pushbutton is depressed,

ground is applied to the 1.6 kHz oscillator (Q1) on

(4) To the through orderwire transmit (TO

1A13A5 causing oscillations and making 1.6 kHz tone

CABLE) through IC amplifier Al, filter FL1, and

available at the output of the oscillator. The 1.6 kHz

transformer T1 on 1A13A3.

oscillator tone is distributed through IC amplifier Al on

f. The 1.6 kHz monitor (integrated circuits A3 and

1A13A5 as follows:

A4) on 1A13A4 detects the in-band signaling tone (1.6

(1) To the loudspeaker through closed

kHz) when it is present on any of the inputs and causes

contacts of the RING switch, peak limiter B (integrated

relay K1 on 1A13A4 to become energized. With K1

circuit A3) on 1A13A5, IC amplifier A2 and closed

energized, the signal is directed to the loudspeaker

contacts of relay K1 on 1A13A4, and IC amplifier A2 on

passing through IC amplifiers (Al and/or A2) and

1A-13A2.

contacts of relay K1 on 1A13A4 and IC amplifier A2 on

(2) To the loudspeaker through emitter

1A13A2. Note that with K1 energized the speaker

follower Q5 and IC amplifier A2 on 1A13A2.

volume control is bypassed.

Energizing K1 also

changes the RING indicator color from green to amber.

g. Signaling tone is generated locally by pressing

the RING pushbutton located on meter panel assembly

Change 6 2-24.17/(2-24.18 blank)