Motorola GM300 Series, Руководство по продажам

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2-12 FEATURES AND BENEFITS
5.2 Nuisance Channel Delete
Nuisance Channel Delete allows channels which continually generate unwanted calls or noise to be
temporarily removed from the scan list. The priority channel, last channel in the scan list and home
channel cannot be deleted.
A programmable button must be set up as nuisance channel delete. Deleted channels can be
recovered by turning the radio or scan off and back on again.
Benefits
Nuisance Channels can be temporarily removed from the scan list by the user.
Efficient radio operation as the radio just listens to channels where valid calls will be received.
5.3 Carrier Squelch Scan
Carrier Squelch Scan allows the user to hear all activity on the scan list channels; the radio does not
check PL/DPL or tone signalling. Scanning just for carrier is the fastest scan method.
5.4 Scan Vote
Scan Vote mode is used in multi-frequency simulcast systems that provide wide area repeater
coverage in applications where frequency spectrum is readily available. The typical system has a
set of scattered base sites that are transmitting the same information on different frequencies. The
radios scan the frequencies of these base sites and perform a voting algorithm to select the
strongest base site. The radio’s transmit frequency is typically the same on every channel, but the
radio’s receive frequencies are different.
The voting algorithm is described in the CPS help text.
6.0 Transmit Features
6.1 Transmit Time-Out Timer (TOT)
The Transmit Time Out Timer limits the duration of calls by cutting off transmission after a
pre-programmed time.
TOT can be implemented in order to enforce efficient use of air time. Also in vehicular operations, a
microphone can accidentally be lodged between seats or other objects and accidentally become
continuously keyed. This would deny other users from using the channel. TOT automatically ends
the call and frees up the channel.
The TOT can be
non-cumulative: the TOT returns to zero each time the radio is de-keyed;
cumulative: the TOT adds all transmission times since the call started. The TOT returns
to zero when the call ends (auto reset timer expires or is cancelled).
A “TOT Pre-Alert” can be programmed to sound five seconds before the transmission is cut off, to
warn the user to finish the conversation.