Category Archives :Radio knowledge

Mobile radio generally installed in the car. Its power directly come from car battery. The power of mobile radio is around 25-50w, with a high gain antenna, the communication distance is usually around 30 kilometers. This is not achievable with a handheld radio.  ...

antenna SWR, antenna gain, and Directionality are reference factors for judging the quality of an antenna.  ...

Who Uses Walkie-talkies When Cell Phones Are So Powerful?  ...

when we use ordinary Yagi antennas and hand antennas, we must rotate the direction, look for the signal, and then successfully receive it, and then carry out satellite communication.  ...

Amateur radio enthusiasts have always been regarded as special "players". Most of them have noble industry spirit and social responsibility. However, radio amateurs are also a complex group: there are repeater builders, DX players, DIY technicians, etc., which kind do you belong to as a radio amateur?  ...

The polarization of antennas refer to the space vector direction of the electric field of the antenna in its maximum radiation direction. There are three polarizations including linear polarization, circular polarization, and elliptical polarization. Among them, linear polarization and circular polarization are more common.  ...

As we all know, the transmission distance of VHF and UHF signals is very limited in normal, but under certain conditions, long-distance or even ultra-long-distance transmission can also be achieved.  ...

Bluetooth is a wireless technology, In recent years, Bluetooth technology has been used on wireless two way radios. Such as on Ailunce HD1, you can connect a Bluetooth adapter. another example, on Retevis RT78, it can be program on APP via Bluetooth.  ...

Planned Amateur Radio Satellites  ...

"Connecting amateur satellites" is a topic that many people think is particularly profound, and some people even flinch directly. Is connecting amateur satellite really so advanced? Today, we will have a brief understanding of amateur satellite through a few questions and answers.  ...