14
SCAN OPERATION
The SCAN function allows monitoring of up to 8 or 16 receive channels
(depending upon which control module is being used). The scanned channels
may be any frequency within the frequency band limits of the radio and may be
Channel Guard protected. The radio messages will then be received only if the
correct Channel Guard signal is present.
Any channel may be scanned with or without priority level. One channel may be
programmed for Priority 1 (P1) and another for Priority 2 (P2) with any or all
remaining programmed channels being scanned as non-priority.
RECEIVE SCAN RATE
The scan rate for the radio will vary depending upon the number of channels
programmed into the scan memory and whether or not Channel Guard is
programmed. For a 16 channel radio the scan rate will vary from 1.1 to 4.4
seconds for non-priority channels and 0.3 to 1.2 seconds for Priority 1 and 2
channels. The scan rate will be faster when fewer channels are programmed into
scan memory.
Scan operation will be determined by the following conditions:
•
Priority 1, Priority 2, and Non-Priority Programmed*
The Priority 1, Priority 2, and up to six remaining channels in an 8 channel
radio or 14 channels in a 16 channel radio will be scanned. Once a carrier is
detected (or correct Channel Guard tone is decoded), the digital display will
indicate the Channel. Sampling of the Priority 1 and Priority 2 channels
continues while receiving a message on a non-priority channel. Should a
Priority 1 or 2 channel carrier (and correct Channel Guard) be detected
while a non-priority channel is being received, the applicable indicator, P1
or P2, lights and the channel is switched to the Priority 1 or 2 channel
regardless of what is being received on the non-priority channel.
If a Priority 2 channel is detected, sampling of the Priority 1 channel
continues. Once a carrier (and correct Channel Guard) is detected on the
Priority 1 channel, the channel is switched to the Priority 1 channel
regardless of what is being received on another channel (Non-priority or
Priority 2). No sampling occurs during transmit or if a Priority 1 channel is
receiving.
•
Non-Priority Programmed
Up to 8/16 non-priority channels may be scanned. Once a carrier is detected
(or correct Channel Guard tone is decoded) the digital display will indicate
the channel. Scan will stop and remain on the channel until the carrier
disappears; after a few seconds scanning resumes. The channels will be
scanned in descending order.
