Kenwood TM-451A - Manual (Page 82)

DUAL TONE SQUELCH SYSTEM (DTSS)
DTSS provides a more refined method than CTCSS to
selectively communicate with specific stations. A total of
1000 3-digit DTMF (Dual Tone Multi-Frequency) codes
are available to be used as addresses for stations with
which you want to communicate. These codes can be
changed easily and regularly as required. Due to the
quantity of different codes, large networks can be set up
that use DTSS for selective calling and receiving. By
including group codes in the network plan, sub-groups
within the network can be contacted without disturbing
others monitoring the same frequency.
If your needs are simpler, DTSS also serves a useful
purpose when you only want direct communication with a
few close friends on your favorite frequency. A good
example of this application is at Hamventions when a
particular frequency can be virtually unusable due to
overcrowding. If your group switches ON DTSS, your
squelch only opens when a call is received encoded with
the same code that is stored in your transceiver. If no
signal is received for more than 2 seconds after DTSS
has opened the squelch, the squelch then closes.
Anytime you want to monitor all activity on the channel,
you simply switch OFF DTSS.
ACTIVATING DTSS
To switch ON DTSS, press [DTSS].
• "DTSS" appears when DTSS is ON.
• Each press of [DTSS] toggles the DTSS function ON
and OFF.
t , i O O C
I - I I . J l J l U
1 S ■ T • ОУСЙ
Pressing [PTT] automatically sends your DTSS code.
Pressing [DTSS] while [PTT] is held down, resends
your code with the exception of European versions using
the Tone function.
Note:
► When [DTSS] is pressed with Page ON, Page is automatically
switched OFF, and DTSS is switched ON.
► Both DTSS status and a DTSS code can be stored in a memory
channel or the Call channel. Further, when recalling either a
memory channel or the Call channel with DTSS status ON while
using the VFO with Page switched ON, Page is given priority and
the DTSS status switches OFF.
► The microphone is inhibited while the DTSS code is transmitted.
► If DTSS and Tone Alert are ON, there is no speaker output
except the alarm tone even if a signal is received with the
correct DTSS code.
75