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Retevis RT85 is an analog radio which comes with emergency alarm function. Its frequency range is VHF 136-174Mhz and UHF 400-470Mhz. For the first time use full dot matrix screen.  ...

Retevis new generation Mini DMR mobile radio RT73, it integrated brand new features, and be capable of all advanced digital technology features. It utilizes TDMA technology to attain double call capacity on a permitted frequency.  ...

The History of China's Amateur Radio Competition in My Eyes 6, In 1990-1991, the group station operators were younger  ...

Digital filter can effectively filter out the frequency point of a specific frequency or the frequency other than the frequency point and is a device or circuit that has a signal processing effect. It is equivalent to the "sieve" of frequency.  ...

China Amateur radio competition rising phase of the cycle 1988-1989  ...

Recently Local HAMs use a repeater to assist in rescues. Let's have a look at how they did a repeater call to help prevent more damage.    ...

Single-frequency repeater, it is a repeater that uses only one frequency to achieve the repeater function. It allocates one timeslot to receive a signal and the other to transmit it at the same frequency, using DMO mode to extend radio coverage.  ...

The collective Stations take part in the match in 1786 and 1987  ...

China's Amateur Radio Competition Set sail again in 1985  ...

The start of amateur radio activities in our country is not too late. In the 1920s, Shanghai was already the economic and trade center of East Asia at that time. Not only commercial radio stations were introduced, but amateur radio activities were also brought into China.  ...