Communications Company IC-29, Руководство пользователя

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COMMUNICATIONS COMPANY • IC-29 Manual
MIC LEVEL
An audio signal level between .78 mV (-60 dBm) and 7.8 mV (-40 dBm). Very small as compared
to a LINE LEVEL signal. A mic level signal must be pre-amplified before connecting to a line level
input.
OUTSIDE
The station whose listening volume is controlled by the OUTSIDE level knob. Usually the cus-
tomer side
PHANTOM POWER
A voltage required by some electret condenser microphones which appears equally between
mic+ and mic- (pins 2&3). Pin 1 remains ground and circuit minus.
PUSH-TO-TALK (PTT)
When a person either desires to talk to another station or override the Vox operation, pushing
the "talk" button provides "Push to Talk / Release to Listen" function.
RETURN-TO-LISTEN (RTL)
When the person speaking is done, or the TALK button is released, the amplifier automatically
switches back to listening to the other person.
SEPARATE MICROPHONE
1. A microphone which is not a speaker.
2. A microphone not on the same plate as a speaker.
SEPARATE SPEAKER
1. A speaker which does not double as a microphone.
2. A speaker not on the same plate as a microphone.
SIMPLEX OPERATION
A system that allows conversation in either direction, alternating, but only one direction at a time.
SPEAKER/MICROPHONE
A speaker which doubles as a microphone. A 45 ohm speaker works best for this application.
NOTE: Using a 45 ohm speaker as a microphone does not deliver the same sound quality as a
separate microphone.
VOX
Voice activated switching. When in VOX mode, the person on the inside simply starts speaking,
the amplifier automatically switches on, causing their voice to come through the outside speaker.