Tac/Com Control Head Manual

SM06 Rev. 4.10

3.4.1.4Radio Mode Switch

Radio

Mode

Switch

The last radio specific control is the MODE or FUNCTION switch, which varies with the type of radio used. For NT-series transceivers, it selects either NORM or SCAN modes of operation, as specifically defined in the status line.

For NT-series transceivers scanning occurs at 90 channels/second/radio, and the following scan modes (defined in the status edit mode) are:

LIST (up to a block of 32 channels/list).

PRIORITY (up to 2 priority channels + active monitor channel).

LIST+PRIORITY (2 priority + 30 channels in a given block).

Priority monitoring is 3 times/second for a 10-15ms sample. The radio will re-channel to the priority channel if traffic is detected, and returns to the monitor channel (channel the radio was resting on when scanning was selected) after a 2 second latency. All CTCSS tones or DPL codes are inactive during scanning (due to lock delay).

With some radios, this mode switch is reserved for GUARD or MAIN transmit selection, as scanning is not supported. It may also select SIMPLEX or direct (repeater talk- around) operation as opposed to NORM (Duplex) or repeater operation. Data for all channels is stored as individual TX and RX frequencies, which permits them to be entered and used in any way. The forced SIMPLEX function pushes the stored RX frequency into the TX slot temporarily to permit 'talk-around' of an existing stored repeater frequency, and avoids having to store a separate channel with this information.

3.4.2General Controls - NORMAL Operation

The general control head functions include the switches that effect the over-all operation of the control head. Some of these switches have dual functions depending on control head mode of operation. The two modes of operation are NORMAL and EDITING.

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Jan 4, 2006

ENG-FORM: 806-0106.DOT

 

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