Category Archives :Radio knowledge

The terms "two-way radio" and "walkie talkie" are often used interchangeably. Both are capable of sending and receiving radio transmissions. So what's the difference? It's mostly nothing to do with the radios themselves, just the way that different types of user refer to them.  ...

One of the most useful features of modern digital two way radios is text messaging. This capability allows users to send texts via keypads on their radios and read them on their LCD displays.  ...

Every HAM with a radio license has a callsign. The callsign is the code name of the HAM, it is used to identify a person (HAM).  ...

Some information about shortwave radio station Ailunce HS1  ...

Emergency rescue communication refers to the communication activities carried out when some major emergencies (such as all kinds of major natural disasters, large-scale terrorist attacks, etc.) occur, resulting in a large number of casualties and heavy losses of social property.  ...

Amateur radio operators exchange QSL cards to confirm two-way radio contact between stations. Each card contains details about one or more contacts, the station, and its operator. At a minimum, this includes the call sign of both stations participating in the contact, the time and date when it occurred (usually specified in UTC), the radio frequency or band used, the mode of transmission used, and a signal report.  ...

As an electromagnetic transducer element, the position of the antenna in the entire radio communication system is very important. The quality directly affects the distance and effect of the transmission and reception. In other words, there is no radio communication without the antenna.  ...

We know the VSWR of the antenna system is close to 1:1. If it is close to 1:1, it is good. I often hear this question: But what if I can't reach 1? If the standing wave ratio is as small as a few, is the antenna qualified?  ...

Alphabet interpretation is widely used in amateur radio communication. Due to the low output power of amateur stations and the complicated factors of radio wave propagation, the distortion or fading of the received speech signal is serious, which affects the analysis and identification of information.  ...

In fact, the essence of wireless interference is electromagnetic interference. Therefore, in order to solve this problem, it is necessary to understand and analyze electromagnetic interference in order to find protective measures and effective methods for achieving electromagnetic compatibility.  ...