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For amateur radio use part 90 radios had to be programmed to operate on ham frequencies. Now there are some offerings that are actual Part 97 intended for amateur use. Each MotoTRBO radio has an ID that has to be registered and is tied to the callsign of the user. MotoTRBO utilizes "talkgroups." Connect Systems radios do not support UDP compressed headers. To receive a text message from a Motorola radio user, he will have to disable UDP compressed headers.