RTU-292C Operations Manual
3-2
3.2.6
SPEAKER VOLUME CONTROL
This potentiometer controls the volume of audio (except telephone ringer volume) at the front
panel speaker. Rotate clockwise to raise audio from minimum to full. Telephone ringer volume
is controlled independently by an internal adjustment, R156 (see Section 0).
3.2.7
PHONES VOLUME CONTROL
This potentiometer controls the signal level present in the handset earpiece. Rotate clockwise to
increase the audio level.
3.2.8
TEL LINE BUTTONS
These three buttons, PHONE, RADIO and OFF, determine whether the internal telephone, the
radio, both, or neither (OFF) are connected to the telephone line.
Pushing the TEL LINE/PHONE button connects the RTU-292C internal telephone to the
telephone line and allows dialing using the keypad. Pushing this button will also answer an
incoming telephone call. The associated LED will be illuminated while the telephone line to
internal phone path is selected.
Pushing the TEL LINE/RADIO button connects the telephone line to the radio through the DSP
adaptive hybrid. The unit then starts its adaptation cycle by putting a burst of white noise onto
the telephone line. When the adaptation cycle is underway, the TEL LINE/RADIO LED will
flash. After successful completion of the adaptation cycle, this LED will be on continuously,
indicating that the unit is ready for operation.
The TEL LINE/OFF pushbutton will hang up any active TEL LINE/RADIO or TEL
LINE/PHONE connection.
3.2.9
HANDSET BUTTONS
These two buttons, PHONE and RADIO, allow the handset to be connected to the internal
telephone, the radio, or both simultaneously. Each button has an associated LED that is
illuminated when the path is active.
Pushing the HANDSET/PHONE button connects the handset to the telephone audio path ad
activates the handset microphone. Note that this will not take the telephone off-hook; the TEL
LINE/PHONE LED must also be on for the handset to be used to communicate over the telephone
line.
Pushing the HANDSET/RADIO button selects the handset to the radio audio path. When this
path is selected (HANDSET/RADIO LED is on) the handset PTT switch will key the radio
transmitter.
If both paths are simultaneously selected, the audio heard in the earpiece will be the radio receive
and telephone audio mixed together, and microphone input will be sent both to the telephone line
and to the radio transmitter.
3.2.10
SPEAKER BUTTONS
These two buttons, SPEAKER/PHONE and SPEAKER/RADIO, determine whether the speaker
monitors telephone receive audio, radio receive audio, or both. Note that if a radio-to-telephone
call is underway and both buttons are pressed, the full conversation is being monitored. There is
an LED alongside each button that is illuminated when the associated path is selected.
Summary of Contents for RTU-292C
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Page 35: ...RTU 292C Operations Manual 2 17 Figure 2 1 Outline Dimensions...
Page 37: ...RTU 292C Operations Manual 2 19 Figure 2 3 Location of Internal Option Settings...
Page 38: ...RTU 292C Operations Manual 2 20 Figure 2 4 Internal Option Settings Details...
Page 39: ...RTU 292C Operations Manual 2 21 Figure 2 5 Audio Interface Wiring Diagram...
Page 40: ...RTU 292C Operations Manual 2 22 Figure 2 6 Interface Details...
