Kenwood TM-451A User Manual download pdf (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.

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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.

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Kenwood TM-451A User Manual Page 82

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