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RTU-292 Operations Manual
3.2.11 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.
3.2.12 TEL VOX
This button enables keying of the radio transmitter by the RTU-292 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 2.8). 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.
3.2.13 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-292 is in the Automated Operation Mode and the
unit will automatically answer the phone after 2 rings. See section 3.7 for a description of the
Automatic Operation capabilities of the RTU-292.
3.2.14 AUDIBLE RING BUTTON
This button determines if the ring from an incoming telephone call will be heard via the RTU-
292’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.
3.2.15 KEY PUSHBUTTON
This pushbutton operates the key function of the RTU-292, 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-292 (handset keyswitch, or TEL VOX, for example), not just from the KEY
pushbutton.
3.2.16 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 paragraph
2.10). Note that this LED does not respond to telephone audio.
JPS Communications, Inc.
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