Kenwood TK-940 Conventional System Operation, Talk-around, Transmit disable receive-only channels

OPERATING FEATURES

3-22. Conventional System Operation

Up to 250 (MAX) channels can be programmed for each system programmed as a conventional system. Channels can be selected by the group key.

OT ( ~ u i e t - ~ a l kDQT), (D~gitalQuiet-Talk), or carrier squelch can be set for transmit or receive channels. If signaling is set for transmission, a squelch tail elimina- tor (reverse burst or turn-off code) is transmitted.

Talk-around

The Talk-around feature can be programmed for each channel.

Transmit disable (receive-only channels)

Transmission can be programmed to be inhibited for

:each channel. This feature is used to set receive-only h channels. When the PTT button is pressed on a re- ceive-only channel, a busy tone sounds, and transmis-

sion is not performed.

Busy channel lockout

The busy channel lockout feature can be pro- grammed for each channel. If a channel is locked out by pressing the PTT button, a busy tone is output, and if transmission becomes possible, it starts.

Scanning conventional systems

For the convent~onalsystem scan, only the revert channel of each system IS scanned. If QTor DOT is set for the channel, the channels, including signaling, are scanned.

3-23. External Decoder (KDD-4 Option)

The optional DTMF decoder (KDD-4) ca in the transceiver. Use of the optional dec programmed for each group (for each chan ventional system). The monitor key fun external decoder reset key

r---------

I

I

I

I

I i

I

I

I KDD-4

I

I

I

I '

I

I

:I

------I----

Fig. 3

The KDD-4 can be set with the decode ID of each group. If it is supporled, the following features are available:

Audio mute

If the decode latch Input port is low during reception and the LTR data or signaling matches (when the squelch is open if signaling is not set), the audio is out- put.

During systemlgroup scanning, the "-SCAN-" dis- play changes to the systemlgroup display (or alphanu- meric display). If it is the last call, the revert system/ group returns.

Call indicator, alert tone

If the Decode Latch input port changes from high to low during reception and the LTR data or signaling matches (when the squelch is open if signaling is not set), a KDD-4 alert tone is output. CALL lights or flashes (or nothing occurs) according to the CALL indicator set for each group.

The CALL indicator1KDD-4 alert tone does not oper- ate unless the Decode Latch input port goes high.

Operation during scan

If signaling matches during scanning, the scan stops at the system. The display shows "-SCAN-" until the Decode Latch input port goes low. When the port goes low, the system/group is displayed.

TK-9401941

------ ,- ------------------,I