I've been experimenting with DMR recently, specifically focusing on compatibility with encrypted communication systems.
Devices and firmware versions (typically the latest official version): Yizhu Tong 6900DMR: 6900.V2.007, iRadio UV4R V3.17, Jingtong 1.0.0.0, Ziyou Tong 878UVPlus V4.00
Test results:
① All four devices support ARC4 and AES256 encryption methods. In unencrypted mode, they can communicate normally with each other. Testing of communication between identical devices was not performed due to the lack of identical devices.
② ARC4 Encryption: All three models (except the Yitu Tong 6900 DMR) can send and receive signals normally, and communicate with each other. The Yitu Tong 6900 DMR can normally receive signals from the other three models and correctly decode them; the other three models can also decode the transmitted signals, but all of them sound noisy, suggesting that there is an error in the ARC4 encoding. Conclusion: iradio UV4R = Jing Tong M1 = Ziyou Tong 878UVPlus>Yitu Tong 6900 DMR.
③ AES256 Encryption: Only the iradio UV4R and the Jing Tong M1 can send and receive signals normally, allowing for two-way communication. Based on the receiving situation, the iradio UV4R can normally receive signals from the other three models, but experiences noise when receiving the Likee 6900DMR; the Jing Tong M1 can receive the iradio UV4R signal and correctly decode the audio. The other two models can receive but cannot decode; the Likee 6900DMR and the Freecom 878UVPlus can receive signals from the other three models but cannot decode. Compared to the Likee 6900DMR, the Freecom 878UVPlus's signal can be normally decoded by the iradio UV4R. Conclusion: iradio UV4R>Proficient in M1>FreedomComm 878UVPlus>Yitu Tong 6900 DMR.
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