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|  MIL-I-24078(SHIPS)
3.24.7 Operations directly associated with the station selector switch.-
3.24.7.1 Release lamp. - Operation of the station selector switch in selecting a station to be called
sha11 illuminate the release lamp of the calling station. This light shall serve to indicate that a station
selector button is depressed at the caIling unit and should be released at the end of a conversation.
Depressing the release button to restore the station to standby shall extinguish the release lamp.
3.24.7.2 Call lamp. - Operating the station selector switch of a calling station to originate a call
shall cause the call indicator lamp of the called station to be illuminated providing the called station is not
bus y.
3.24.7.3 Busy indicator circuit. - When the calling station selects a station which is busy the busy
indicator lamp of the calling station shall light and the calling station shall be prevented from transmitting
messages to or receiving messages from the called station. Restoring the selector switch to normal or
standby shall turn off the busy light and restore the station to normal receiving condition.
3.24.7.4 Privacy. - Operation of the station selector switch shall cause the selected station to
become busy to all other stations in the system. Operation of this switch shall also cause the selecting
station to become busy to all other stations in the system. Once communication has been established by
operation of station selector switches, no other nonselected units shall be able to listen or to break in and
talk to any units engaged in conversation except under conditions specified in 3.24.1.3.2.
3.25 Electrical features. -
3.25.1 Circuit design. - The circuit design shall perform the functions specified in 3.24 through
3.24.7.
3.25.2 Terminal markings. - Terminal markings shall be in accordance with MIL-I-17928.
3.25.3 Interconnecting cables. - Type TTHFWA cable conforming to MIL-C-915 will be employed
for interconnection of audio and control circuits when installed. Reduced diameter cable conforming to
MIL-C-2194 shall be employed for power and signal circuit common. A maximum length of 1500 feet shall
be used for calculating line impedance of audio and signal circuits.
3.25.4 Volume control. - The volume control shall provide a maximum attenuation of 30 + 1 decibels
(db) in five steps of 6 1 db. No "OFF" position shall be incorporated in the control.
3.25.5 Rotary and toggle switches. - The handles or keys of rotary type switches shall be provided
with mechanical stops to prevent excessive strain on the switch handle and shaft, and to prevent rotation
of the fixed portion of the switch. All switches shall, after 100,000 operations, when energized at their
rated loads be capable of performing both mechanical and electrical functions for which they are intended.
3.25.6 Press-to-talk switch. - The press-to-talk switch shall be a three position switch which per-
forms the necessary switching required for operation specified in 3.24. The three positions of the switch
reading from the front panel in a clockwise direction shall be "hands free", "normal" and "press-to-talk".
The switch shall be spring loaded such that when released it will return from the "press-to-talk" position
to the "normal" position. When operated from the "normal" to the "hands free" position the switch shall
lock in the "hands free" position until it is again operated to the "normal" position. The "hands free"
position of the switch shall be used to set up the equipment for the operation specified in 3.24.4.
3.25.7 Microphone and telephone handset. - The equipment shall be designed to permit the use of a
type IC/MPM-4 microphone or a type IC/MPH telephone handset which may be connected to the unit by
means of the microphone receptacle specified in 3.8. The design specifications for the type IC/MPM-4
microphone and for the type IC/MPH telephone handset (with the exception of the receiver element) are
shown on Drawing 9000-S6502-74164. The design specifications for the telephone handset receiver element
is MIL-T-15514. Operation with a microphone or handset shall be as specified in 3.24.6.
3.25.8 Loudspeakers. - Loudspeakers shall be type LS-445/U in accordance with MIL-L-12606.
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