HYT TC-780MU1 Manual page 27

Join Group: This group can not only receive calls, but also transmit calls. When called, the radio can only acknowledge in
individual call and in current group.
Simulcast Group: It is same with join group, but PFIX is not compared.
Ack Group: The group can both receive and transmit calls with the Group Call Selector at any position.
Temporary Group: It is grouped with dynamic regrouping command. Its functions are same with those of ack group.
Data Group: The group can only respond to the data group call from the radio, and other radios won't respond to the call
even if they join this group. This group is mainly used for data transmission.
Encryption Group: When this group talks, members in this group enters encryption mode automatically. After disconnect,
they return to non-encryption or encryption mode, which is set during standby. Other functions are same with those of ack
group.
Note 1: Encryption is enabled in encryption mode and encryption is not enabled in non-encryption mode.
Note: 2: In group call mode, the radio only responds to current group, hidden group, fleet-wide all call, ack group,
encryption group, temporary group, system-wide all call and individual group, but not responds to calls of other join
groups.
Note 3: PFIX can be set whether to be compared via the programming software for the above groups except simulcast
group.
Receive Broadcast Message
The radio can receive broadcast messages sent by the system on the control channel, to accomplish the following functions:
add control channel frequency, delete control channel frequency, specify call maintenance parameters, specify registration
parameters, etc. Please refer to the MPT1327 signaling standard for details.
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