E.F. Johnson Company 5300 Series Instructions d'exploitation télécharger pdf (Page 95)

ES Series Mobile Radio Operating Manual 5-13

Conventional Mode Features

Note Priority sampling when scanning SMARTNET/SmartZone/P25 Trunked channels is

described in Section 6.11.1.

The priority channel sampling feature ensures that when priority scanning, messages on

the priority channel are not missed while listening to a message on some other channel.

The radio can be programmed as just described so that the priority channel is a fixed

channel programmed in the current scan list, the currently selected channel, or not used.

Note Priority channel sampling is not available when receiving analog encrypted (DES) calls.

In addition, the priority channel is not scanned if the active channel is an analog channel

on the same frequency as the priority channel and is programmed with CTCSS/DCS

squelch control.

Either a single or dual priority channels can be programmed if desired. With dual priority,

a call on the second priority channel is interrupted by a call on the first priority channel but

not vice versa. When scanning and the selected channel is a single or first priority channel,

“P” is indicated in the left status display next to the zone number as follows:

This indication is displayed regardless of whether the priority channel is fixed or always

the selected channel. When the second priority channel is displayed, “2” is indicated

instead.

The priority channel sampling frequency is determined by the programmed Priority

Lookback Time A (see description which follows). For example, if 2.0 seconds is

programmed, the priority channel is sampled every 2.0 seconds when listening to a

message on a non-priority channel. When not listening to a message, the priority channels

are scanned in the normal scan sequence. With dual priority, the first and second priority

channels are alternately sampled at the Loopback Time.

Priority channel sampling occurs only with conventional scanning. It does not occur with

radio-wide scanning, when listening to any type of SMARTNET/SmartZone/P25 trunked

call, encrypted call, or when transmitting.

The priority sampling times are programmed by the following parameters:

Lookback Time A - This time determines how often the priority channel is checked for

activity. Times of 0.25-4.00 seconds in 0.25-second steps can be programmed.

Lookback Time B - This time determines how often the priority channel is checked

once an incorrect Call Guard (CTCSS/DCS) or NAC code is detected. Since it takes

much longer to detect an incorrect Call Guard signal than a carrier, this time should be

relatively long to prevent the interruptions from making a message difficult to

understand. Times of 0.5-8.0 seconds can be programmed in 0.5-second steps.

Priority Indicator

1 2 ... 90 91 92 93 94 95 96 97 98 99 100 ... 215 216

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E.F. Johnson Company 5300 Series Instructions d'exploitation Page 95