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Category Archives :Radio knowledge

How Should I Choose and Use My Mobile Radio?

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.  ...

Read more  Mobile Radio

How to judge the quality of an antenna?

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

Read more  antenna SWR,  antenna gain

Who Uses Walkie-talkies when Cell Phones are So Powerful?

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

Read more  Walkie Talkie,  Cell phone

Why your Radio can't receive satellite signals? Polarization is wrong

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.  ...

Read more  satellite communications,  Yagi Antenna

What kind of radio enthusiasts do you belong to

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?  ...

Read more  Wireless DIY,  radio enthusiasts,  radio enthusiasts kinds,  QSL

Polarization of Antennna

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.  ...

Read more  Polarization of Antennna

How to transmit long distance for UHF and VHF ?

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.  ...

Read more  VHF&UHF long-distance transmission,  Amateur radio

Getting to know Bluetooth

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.  ...

Read more  Bluetooth technology

How do I start with 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.  ...

Read more  Amateur Satellites