Kenwood NEXEDGE NX-200 Function Reference page 294

10 ANALOG CONVENTIONAL SYSTEM
10.2 Using the Signaling
10.2 Using the Signaling
QT/ DQT is the signaling to be used for facilitating communication within a group if the same channel is shared by several
groups. Also, DTMF, 2-tone and FleetSync can be used as the Optional Signaling to initiate a selective call.
Sharing the Same Channel (Frequency) by Several Groups (QT/DQT)
QT/ DQT is the signaling to be used for facilitating communication within a group if the same channel is shared by several
groups.
QT tone or DQT code has no effect on normal voice communication since QT tone or DQT code uses a subaudible tone.
The transceiver mutes unwanted calls if QT tone or DQT code is configured for each channel. Therefore, a user can
communicate in a group without listening to conversations from other groups.
This signaling does not affect voice communication since the signaling does not use the audible frequency spectrum
above 300 Hz. Also, the transceiver can discriminate the signaling even if reception starts midway through a call since this
signaling type has a continuous waveform.
 QT (Quiet Talk):
QT is signaling using a continuous subaudible sine wave (67.0 Hz to 254.1 Hz). The frequency can be configured in
steps of 0.1 Hz.
 DQT (Digital Quiet Talk):
DQT is a signaling that uses "1" and "0" in 23-bit words. An octadecimal code with a number between 000 and 777 can
be configured. The DQT signal has a polarity and can be configured as Normal or Inverted, corresponding to the circuit
configuration of repeater or the target transceiver.
Following are transmission and reception characteristics of QT tone or DQT code.
If the received QT tone or DQT code matches the QT tone or DQT code preconfigured for the transceiver, the
Reception transceiver unmutes the speaker, and received audio sounds from the speaker.
The audio mutes when the transceiver receives a Reverse Burst (QT) or Turn-off Code (DQT).
The transceiver sends the configured QT tone or DQT code when the transceiver transmits. Pressing the PTT
Transmission switch causes the transceiver to transmit the preconfigured QT tone or DQT code. Also, the QT tone or DQT code
cannot be transmitted or received in a Trunking system zone.
Configuration using KPG-111D/ DN
Configuring the QT/DQT Decode/Encode (
FUNC (K)/Ver 4.00
Table 10-3 QT/ DQT Transmission/ Reception
See FPRG 8.3.3 Page 1 Tab)
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