Causes of co-channel interference of walkie-talkies

Co-channel interference: Interference caused by two or more stations using the same frequency.

Co-channel interference between two analog walkie-talkie communication equipment signals. Such as the co-channel interference of two analog UHF telephone stations;

Co-channel interference between digital and analog signals. Such as the co-channel interference of the link frequency of the paging network to the call frequency;

Co-channel interference between two digital signals. Co-channel interference between two paging networks;

Co-channel interference is mostly caused by the following reasons:

①The user unit used the frequency indiscriminately, for example: a radar group of the army privately occupied the 406.1MHz frequency and interfered with the low-orbit satellites of South Korea.

②The coordination of radio management agencies at all levels is not enough. For example, Lianyungang City, Jiangsu Province and Rizhao City, Shandong assign the same frequency to their respective ports, causing interference.

③ Failure to implement the frequency change documents of the domestic non-commissioned committee in a timely manner caused interference, such as: in 1996, the domestic non-commissioned committee allocated 350-380MHz to the armed police, public security, and security use, and notified the frequency change. Although we also notified it, but due to the frequency change manufacturer The frequency point to be used has not been implemented. The original station has not changed the frequency, and the latter station has come up again, resulting in interference.