EFJohnson 7780 service manual Priority Channel Sampling

TRANSCEIVER OPERATION

1.Press the Scan option switch to enable scanning. The currently selected scan list is momentarily indicated as “Scan x”, where “x” is the list number (1-3).

2.To select one of the other lists, press the number key corresponding to the desired list (1-3) and the selected list is then momentarily displayed as “Scan x”. The selected scan list is stored in memory and does not change until this procedure is repeated.

Programming a Scan List

With full keypad (15-key) models, each of the three scan lists is user programmable if the Scan Edit option switch is programmed and user programming of the list is allowed. Otherwise, the channels in these lists are determined by dealer programming. User scan list programming is not available with limited keypad (3-key) models. Proceed as follows to program a scan list:

1. Make sure all scanning is off (neither the standard

scan “ S” icon or radio-wide scan icon is displayed).

2.Press the Scan Edit option switch and then within 2 seconds press the number key corresponding to the scan list you want to edit (1-3). If a list is not selected within the allotted time, the last active conventional standard scan list is automatically selected. The selected list is indicated as “SCAN x”. If user programming is disabled on a list, “NO LIST” is momentarily displayed and it cannot be edited.

3.Select the channel you want to add or delete using

the and keys. To change zones, press the F1 key and select the new zone.

4.If the selected channel is in the scan list, the box

around “ S” is indicated in the upper left corner of the display. To add the channel to the scan list, press the “1” key, and to delete the channel, press the “2” key.

NOTE: The priority channel cannot be deleted (see Section 2.4.12).

5.To exit this mode and save the changes, press the ENT or CLR key.

Transmitting in Scan Mode

Each conventional scan list can be programmed for one of the following modes. These modes deter- mine if priority sampling occurs and also the channel on which transmissions occur while scanning. Refer to the next section for more information.

No Priority - No priority channel sampling occurs when the list is selected. The radio transmits 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 Selected - The priority channel is always the selected channel. The radio transmits on the selected channel.

Talkback - No priority sampling occurs. The radio transmits on the channel of a call while scanning is halted. Then once scanning resumes, it transmits on the selected channel.

2.4.12 PRIORITY CHANNEL SAMPLING

General

The priority channel sampling feature ensures that when standard scanning, messages on the priority channel are not missed while listening to a message on some other channel. The transceiver can be programmed so that the priority channel is a fixed channel associated with the current scan list, the currently selected channel, or not used (see preceding section). When the selected channel is a priority channel, “P” is indicated in the upper right part of the display.

Priority channel sampling occurs only with Stan- dard conventional scanning. It does not occur with Radio Wide scanning, when listening to any type of SMARTNET/SmartZone call, or when transmitting. A series of “ticks” may be heard when the priority

	November 1999
2-11	Part No. 001-7780-500