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Shortwave is the originator of radio. When the radio was invented, the transmission method was shortwave. In modern times, the frequency band used by radio has expanded to ultrashort wave, microwave, and even higher, but short wave still plays an extremely important role.   ...

Understanding the different modes of digital voice can enable amateurs to clearly understand the bandwidth and transmission rate used by the digital voice mode. It can also help us understand which mode is easier to get started and which mode should be experienced in the future.  ...

Radio direction-finding is the process of using instruments to determine the direction of radio waves based on the propagation characteristics of electromagnetic waves.   ...

On 5th May 1940, Chinese amateur radio operators started “On air conference”. On 5th May 1947, the conference covered all the regions in China, it was the biggest on-air event.  ...

Retevis RT3, RT8, RT82, RT3S, and RT90 are a  series of DMR walkie-talkies. But we may meet the same question after we programed the walkie-talkie and then turn on the radio, radio shows Unprogrammed like below picture. Why?  ...

We know AILUNCE HD1 is an FPP ham radio. It allows you to program the radio without a computer. Expect this, there are lots of little details that make you feel different from other radios.  ...

For DMR repeater, we need to pay attention to frequency, offset, time slot, color code, contact. Some other radios may have to pay attention to work mode, like HD1. today, we will take HD1 as an example.  ...

“Why can't I reach the repeater?” This is probably the most common question we hear from new hams. There are so many reasons that can cause your radio can’t reach the repeater, so it is difficult to come up with a quick fix for all situations. In this article, we will show you sever basic reasons caused this issue.  ...

Wireless Bluetooth MIC HK009 adopts a novel humanized design concept, with smart and exquisite products, complete functions and flexible operation, which allows you to adapt to different use environments anytime and anywhere.  ...

The wireless Bluetooth headset adopts a novel humanized design concept, with smart and exquisite products, complete functions and flexible operation, which allows you to adapt to different use environments anytime and anywhere.  ...