EFJohnson 761X, 764X service manual Priority Channel Sampling, November, Part No

OPERATION

The scan lists are user programmable if the TAG key is available. Pressing this key changes the

status of the displayed channel in the current scan list only. The display indicates “SC ON” if the channel was just added to the scan list and “SC OF” if it was just deleted. In addition, the scan list status is indicated by the decimal point in the display. This indicator is on when the displayed channel is scanned. The decimal point flashes when scanning is occurring.

The scan list status of a channel can be changed while scanning only when listening to a message on the channel. The current status of all the lists is stored in memory. Therefore, the status of the various scan lists does not change when power is turned off.

3.6.3 PRIORITY CHANNEL SAMPLING

Priority channel sampling ensures that messages on priority channels are not missed while listening to

messages on other channels. If priority sampling is used, a priority A channel is designated by program- ming. If the PRI A key is available, pressing that key selects the priority A channel. This key also may be programmed so that if it is pressed and held, the prior- ity A channel changes to the current channel.

Sampling of the priority A channel occurs only when scanning is enabled. It does not occur while transmitting. When the priority channel is sampled while listening to a message on another channel, a series of “ticks” are heard. These ticks are brief inter- ruptions of the audio signal that occur while the trans- ceiver changes channels to check the priority channel.

Another priority channel also can be programmed that can be quickly selected by the PRI B key. This channel is programmed only to allow quick selection and is not sampled while listening to a non-priority channel.

November 1998
Part No. 001-7600-001	3-8