Hytera PD502 - Troubleshooting and Problem Solving; Power On and Signal Quality Issues; Communication and Interference Resolution

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key. When the channel is free, you can press and hold down the PTT key to transmit.
Time-out Timer (TOT)
The purpose of TOT is to prevent any user from occupying a channel for an extended period. If the preset
time expires, the radio will automatically terminate transmission and keep beeping. To stop beeping,
please release the PTT key. You must wait for a certain time period (preset by your dealer) to initiate
another transmission.
If the pre-alert function is set by your dealer, your radio will alert you to the TOT expiration in advance.
Pseudo Trunking
This feature can be enabled via the programming software. If your radio operates on a channel with this
feature enabled and one time slot is already occupied, it can transmit and receive on the other free time
slot, allowing you to communicate timely under emergent situations.
MIC AGC
If enabled via the programming software, your radio will process the audio signals during transmission,
providing improved audio for the receiving radio.
Radio Registration Service
If enabled via the programming software, your radio will automatically register in the system within a
certain period after power-on. Then it can acquire online information of other radios via accessing specific
servers within the valid registration period.