Kenwood TK-2170 Series Function Reference page 67

16 SIGNALING
Signaling methods supported by this transceiver include
Optional Signaling (DTMF, 2-tone and FleetSync) and
QT/DQT for making selective calls. QT/DQT is used to
control the Mute function.
16.1 QT/DQT Decode/ Encode
QT/DQT is the signaling used for facilitating
communication within a zone when sharing the same
channel with several zones (Talk Group).
QT/DQT does not affect normal communications since is
uses sub-audible frequencies.
QT/DQT allows a user to use the signaling in
Conventional Group and enables Squelch Tail Eliminator.
(Refer to 14 Conventional Group on page 39.)
The transceiver mutes unwanted calls if QT/DQT is
configured for each channel or Talk Group. Therefore, a
user can communicate within a Talk Group without
hearing conversations of other groups.
Below 300 Hz in frequency, this signaling does not affect
voice communications since it uses sub-audible
frequencies. The transceiver recognizes the signaling
even if the transceiver starts receiving on-going
communication since this signaling type has a continuous
wave form.
Table 16-1 QT/DQT
QT (Quiet Talk) uses a continuous sub-audible
QT
sine wave (67.0 to 254.1 Hz).
DQT (Digital Quiet Talk) is signaling with 23 bit/
word format (Code: 000 to 777 (octal number)).
DQT
DQT has a polarity and Normal or Inverted can be
configured.
The following QT/DQT operations are available.
Table 16-2 QT/DQT Operation
If the received QT/DQT signal matches the QT/
DQT configured in a transceiver, the received
audio is emitted from the transceiver.
Reception
The transceiver mutes the received audio if the
transceiver receives a Reverse Burst (QT) or
Turn-off code (DQT).
The transceiver sends the QT/DQT code
configured for the transceiver when the
Transmission transceiver transmits. The transceiver keeps
sending the programmed QT/DQT as long as
the PTT switch is pressed.
QT/DQT Decode and QT/DQT Encode can be configured
for each channel by using KPG-101D.
FUNC (K)/Ver. 1.01
Configuration using KPG-101D
• Configuring the QT/DQT Decode (Refer to FPRG
6.4.5 QT/DQT Decode.)
•
Configuring the QT/DQT Encode (Refer to FPRG
6.4.6 QT/DQT Encode.)
16.1.1 QT/DQT with STE
(Squelch Tail Eliminator)
Squelch Tail Eliminator when used with QT/DQT
eliminates the tail noise from the transmitting party signal
in order to communicate comfortably.
16.2 Optional Signaling
Optional Signaling is signaling used for making an
individual call. If DTMF or 2-tone is used, the transceiver
emits the Alert Tone and starts transponding if the
received Optional Signaling matches the Optional
Signaling configured in the transceiver. The transceiver
does not transpond if FleetSync is used.
DTMF, 2-tone and FleetSync can be used for Optional
Signaling. (Refer to 18 DTMF on page 63, 20 FleetSync
on page 81.)
Optional Signaling can be configured for each channel by
using KPG-101D.
Configuration using KPG-101D
•
Configuring the Optional Signaling (Conventional
Group) (Refer to FPRG 6.4.11 Optional
Signaling.)
•
Configuring the Optional Signaling (Trunking
System) (Refer to FPRG 6.6.7 Optional
Signaling.)
Confidential 55
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