Initially, multiple radio stations under the same license/call sign can communicate with each other. However, it is necessary to distinguish between the operators during communication. Specifically, if the operator is the same person, you can call yourself during communication.Although it might seem strange, following the rules is important; if there are multiple operators (all of whom have the relevant level operating licenses), they can use their own call signs to transmit to the device (the call sign does not need to include a region prefix); if the operator does not have a call sign, then a call sign must be used. Therefore, the most important thing isAre there so many callsigns (under legal conditions) and so many operators (under legal conditions); or are you simply testing two devices transmitting and receiving, or verifying a specific communication method? You can deviate from common frequencies when transmitting and add "test" information before and after your own station identifier.
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