External Switches (Remote).

TM 11-5831-201-20

t h e radio transmitter or interphone line for

d. External Switches (Remote). One or more

transmission purposes.

of the switches described below are required for

use with the control set to permit a user to talk

(2) Crew station switch. A crew station talk

over the interphone line or transmit over radio.

switch, such as Plug, Connector U94A/U (fig.

The quantity and type of switches used will differ

13), is used for connection and control of Head-

between types of aircraft in which they are in-

set-Microphone H101/U. This is a push-to-talk

stalled and may differ between models of the

type of switch normally used by crewmembers

same type of aircraft. Mechanical operation of

who have access to interphone facilities only.

these switches, as well as physical appearance

(3) Hot mike switch. This switch is usually

and panel control markings, will often differ. The

a double-pole, single-throw, locking-type switch.

switches are mounted near a user's station.

It is used to connect the user's microphone output

to the interphone line without holding a non-

(1) Transmit-interphone talk switch.. This

Iocking crew station talk switch or transmit-

switch is usually a double-pole, double-throw,

interphone talk switch in a closed position.

push-to-talk type switch. It is used to select either

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