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RTU-292C Operations Manual
3-3
3.2.11
TEL VOX
This button enables keying of the radio transmitter by the RTU-292C VOX (Voice Operated
Xmit) facility. When the VOX is selected (associated LED ON), the VOX is active, and the key
relay is energized when the VOX circuitry detects a signal from the telephone line. The VOX
PTT output has a “hang” time to keep it from dropping out during short pauses in speech. The
hang time duration is the length of time that the PTT signal will remain active following the loss
of detection of signal. (The hang time is internally adjustable; see Section 0). If the TEL
LINE/RADIO LED continues to flash for more than ten seconds after the TEL LINE/RADIO
pushbutton has been pressed to make a connection, the unit has not adapted properly and VOX
operation will not be possible.
3.2.12
AUTO ANS BUTTON
This pushbutton may be used to manually enable (LED ON), or disable (LED OFF), the Auto
Answer feature. When enabled, the RTU-292C is in the Automated Operation Mode and the
unit will automatically answer the phone after 2 rings. See Section 3.7for a description of the
Automatic Operation capabilities of the RTU-292C.
3.2.13
AUDIBLE RING BUTTON
This button determines if the ring from an incoming telephone call will be heard via the RTU-
292C’s speaker. When the Audible Ring mode is enabled, the ring signal will be audible in the
speaker. The ring volume is independent of the SPEAKER VOLUME setting, and is set
internally by adjustment R156. Regardless of the position of the AUDIBLE RING button, the
LED indicator associated with the TEL LINE/PHONE button flashes on an incoming ring, so
that a visual indication of the ring signal (incoming call) is always provided.
3.2.14
KEY PUSHBUTTON
This pushbutton operates the key function of the RTU-292C, sending a key command to the
associated transmitter. This button is functional at all times. The red KEYED LED next to the
KEY pushbutton is lit whenever a key command is sent to the transmitter from any source within
the RTU-292C (handset keyswitch, or TEL VOX, for example), not just from the KEY
pushbutton.
3.2.15
PEAK LED
This red LED flashes on audio peaks that are detected in the audio incoming from the receiver to
indicate the proper adjustment of the internal RX LEVEL control (R116). The input level is
correct when the PEAK LED flashes occasionally on incoming receiver speech peaks. If the
LED flashes continuously, the input level is too high and should be reduced (see Section 2.10).
Note that this LED does not respond to telephone audio.
3.3
REAR PANEL CONNECTORS
Accessible at the RTU-292C rear panel are the radio connector, telephone line, the DC power
terminal block, an RS-232 connector, and the DIN plug for connecting the external AC power
supply. See Section 2.9 for full pin-out information.
3.3.1
P1 RADIO CONNECTOR
This male DB9 connector is the interface between a radio system and the RTU-292C. It contains
transmit audio, receive audio, and keylines.
Содержание RTU-292C
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