E.F. Johnson Company 9800 Series Manuel de service télécharger pdf (Page 38)

PROGRAMMING

3-12

Revised January 2001

Part No. 001-7780-501

as described in Section 2.3.11. User editing can be

enabled and disabled on each scan list.

Scan Mode

Sets the channel on which transmissions occur

when the PTT switch is pressed while scanning. A

different mode can be programmed for each scan list.

In addition, it selects if priority sampling is used and

also the type of priority channel (see the “Priority

Channel” description which follows). The following

modes are available:

No Priority - Priority sampling does not occur (all

channels are scanned in sequence). The radio trans-

mits on the selected channel.

Priority/Tx Priority - Priority sampling occurs

and the priority channel is the one programmed in

the selected scan list. The radio transmits on the

priority channel.

Priority/Tx Selected - Priority sampling occurs

and the priority channel is the one programmed in

the selected scan list. The radio transmits on the

selected channel.

Priority on Sel Chan - The priority channel is

always the selected channel (even if the scan list is

programmed with a priority channel). The radio

transmits on the selected channel.

Talkback Scan - No priority sampling occurs

(even if the scan list is programmed with a priority

channel). The radio transmits on the channel of a

call while scanning is halted. Then when scanning

resumes, it transmits on the selected channel.

Scan Timers

Scan Hold Time - Sets the delay that occurs before

scanning resumes after a signal is no longer

received (see Section 2.3.11).

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 incor-

rect Call Guard (CTCSS/DCS) 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 Channel Selection

The Scan Mode parameter in the preceding

Conventional System Scan List screen selects if

priority channel sampling is enabled on the selected

scan list. It also selects the type of priority channel

(either fixed or the selected) if applicable.

If the “Priority/Tx Priority” or “Priority/Selected”

mode is programmed, fixed priority channel sampling

is selected. The fixed priority channel must then be

chosen for the scan list. To do this, click the

button in the preceding Modify Scan List

screen and then select the desired zone/channel. Refer

to Section 2.4.12 for more information on priority

channel sampling.

3.5.3 SETTING UP CONVENTIONAL

CHANNELS

The conventional Channel screen shown in

Figure 3-3 which follows is displayed when a conven-

tional channel is selected. This screen programs

unique channel parameters and also assigns channels

to the selectable zones displayed by the transceiver.

The general procedure for setting up a conven-

tional channel is as follows. Refer to the descriptions

which follow this procedure for information on the

parameters in the channel screens.

1. Make sure that the desired zone is selected in the

Zone box.

2. Select the channel number in the Channels Index

box which is to be programmed with the channel. If

the channel number display mode is selected (see

Section 2.4.2), this will be the number displayed

when the channel is selected.

3. To assign a conventional channel, select “Conven-

tional” as the channel type.

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E.F. Johnson Company 9800 Series Manuel de service Page 38

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