GAI-Tronics L3149B C200 Advanced Deskset - Manual (Page 17)

L3149B (C200) Advanced Tone Remote Desk Set Operation
11
Initiating Calls
Before initiating a call in a conventional system, press the
MONITOR
button to verify that the radio
channel is clear. Always allow time for the radio channel to be established. In addition, if the unit is
configured to generate PTT IDs and to generate side tone, a tone will be heard during the PTT pretime and
PTT generation. A voice delay can be programmed via the programming software to eliminate this
waiting time if no PTT ID is used.
To initiate a call, press the
TRANSMIT
button, the handset push-to-talk (PTT) pressbar, or an accessory
PTT button. When the desk set is transmitting, the
TRANSMIT
LED illuminates. The
TRANSMIT
button
or handset PTT bar must be held down while talking to the radio user and released to listen. When the
transmission is completed, the
TRANSMIT
LED extinguishes and the desk set returns to the receive mode.
In a CDM1550 LS Mobile Radio system operating in the local control mode, the radio provides an output
as indication that a channel has been established. The
TRANSMIT
LED illuminates when this occurs and
the user can transmit. If no channel can be established, the display shows “SYS NOT AVAIL”.
Handset Transmit
Use of the handset is recommended when the desk set is located in noisy surroundings or if full-duplex
2-wire operation is desired. This may be used for types of systems that provide talk courtesy tones, such
as trunking. Press the handset PTT bar or
TRANSMIT
button and speak into the handset microphone to
transmit when the handset is off-hook and after the
TRANSMIT
LED lights.
Transmit From Internal (Local) Microphone
Use the internal microphone only in low noise environments. The handset must be on-hook for the local
microphone to operate. Press the
TRANSMIT
button and speak in the direction of the integral microphone
after the
TRANSMIT
LED lights. For the best transmit audio quality, maintain a distance of about 18
inches from the microphone.
Transmit From Desk Microphone or Footswitch
All models can be keyed to transmit with an external desk microphone through the audio accessory port.
When a PTT signal is asserted through this port, TX audio will also originate through this port. Use of the
XDM002A Desk Mic is recommended.
N OTE : The polarity of the desk mic PTT and monitor inputs is programmable. If the polarity of either of
these inputs is set for normally closed, it is necessary to keep the desk microphone connected at all times.
Removing the microphone during operation may cause the keyboard to stop responding. This is caused by
the internal pull-ups on these two pins. If the desk mic maintains a normally closed connection to ground,
the connection is opened when the button is pressed and the desk set recognizes the key as pressed.
Without the desk mic connected, the connection remains open and the desk set continually sees the key
pressed.