Hytera PD70X Series, System Planner Manual

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Hytera DMR System Planner
37
The radio may need to transmit during the scan, while the stayed channel, selected
channel, last active channel and frequently used channel are different channels.
Thus, you need to designate a transmitting channel for the radio. During the
transmission when scanning, you may need to call on the current channel, or
respond to the detected voice on the stayed channel, or call a user on the frequently
used channel. To meet your needs, Hytera DMR provides the Scan Tx Mode
configuration in the CPS, so you can designate a channel for the transmission
during the scan. You can have the following configurations:
ˆ Selected Channel: to transmit on the current channel.
ˆ Last Active Channel: the channel the radio stayed on last time.
ˆ Designed Channel: to transmit on the specified channel.
If the Talkback feature is enabled, when the radio is staying on a channel, it will
transmit on that channel rather than the preset channel in Scan Tx Mode. If the radio
is scanning, it will transmit on the preset channel in Scan Tx Mode. If sweeping the
priority channel, it will go back to the stayed channel before the sweeping to
transmit.
If some mismatching signals are detected during scan, the system will mark the
channel. And the radio will only detects whether a carrier is present on the marked
channel during next scan process. If a carrier is present on the marked channel, the
counter increases a step, and the radio will go to the next channel for detecting.
Otherwise, the counter resets and the radio will check all conditions next time. If the
counter counts up to ten (10), the radio will clear this mark and check all conditions
next time. This feature is defined via the CPS. Even if the feature is not set, the radio
will still check all conditions of the channel and stay on it for some time. This feature
is used to save the scan time. The scan may take a long time. To those channels
with mismatching signals, the system will still scan and stay for some time. In deed,
the time can be saved in the way that the system marks such channels and simply
scan them next time and skip to other channels.
Hytera DMR scan provides Priority Channel Sweep function. During the scan,
missed detection of some channel activities is inevitable. To avoid missing detecting
the activities on some high-priority channels, the system can be timed to return to
the priority channel for scan.
When the radio detects the active channel, it will stay in the channel. And it will
sweep a higher-priority channel. When there is active signal detected on the priority
channel, the radio will jump to it immediately; in case of no signal detected, the radio
will stay on the current channel. To use the Priority Channel Sweep function, you
simply need to set the sweep time according to the urgency. The sweep time range