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Category Archives :Radio knowledge

Do you really understand FM?

NFM is a narrowband frequency modulation method, which is suitable for communication signals with a channel bandwidth of 25kHz / 12.5kHz; WFM is a wideband frequency modulation method, which is suitable for receiving broadcast signals with a channel bandwidth of about 180kHz  ...

Read more  WFM,  NFM

What is the DMR Radio Zone?

Zones are just a way to manage large number of channels, much like file folders or directories on your computer.  ...

Read more  Radio Zone,  All Channels

What's explosion-proof walkie-talkies?

Do you know explosion-proof walkie talkie? Today, I'll share something related to you in the blog.  ...

Read more  explosion-proof walkie talkie,  Retevis RT56

Is There Anybody Listing to the Radio Broadcast Now?

Is there any body listing to the radio broadcast now? whether radio broadcast is going to fade away? In my opinion, the radio broadcast will not going away. It may be integrated into the cell phone, or it can exist in other ways.  ...

Read more  Radio Broadcast

A Radio Museum in Mexico City Subway Station

A Mexico City subway station boasts a hidden museum, complete with a working radio booth.  ...

Read more  Radio Museum

The Difference Between Walkie Talkie and Mobile Phone Antennas

Why does the walkie-talkie have a long external antenna, and most of the mobile phones are built-in antennas?  ...

Read more  Antenna,  Walkie Talkie,  Mobile Phone

How does the walkie-talkie work in emergency rescue operations?

The application of walkie-talkies in the field of emergency rescue is becoming more and more mature. For rescue fighters, walkie-talkies are not only a communication tool for them to keep in touch with the team, but also an important equipment for escorting them at critical moments.  ...

Read more  Emergency,  Waterproof Radio

How to Achieve Interoperability Between Different Models of Walkie-Talkies?

We all know that the default factory frequency of each manufacturer's walkie-talkie is different, so different brands of walkie-talkies can not communicate with each other directly. This is a concern of the majority of new hams.  ...

Read more  Different Model Communication

How Far Can the Walkie-Talkie Communicate?

How Far Can the Walkie-Talkie Communicate? To be honest, every time you are asked this question, there will be a feeling that it is difficult to explain. That's because in the wireless communication profession, there is no "distance" technical parameter. There are too many factors that can affect the wireless signal propagation distance.  ...

Read more  Communicate Distance

What is the Difference Between Explosion-Proof and Ordinary Walkie-Talkie?

The explosion-proof walkie-talkie does not refer to the walkie talkie that can resist explosion, but a walkie-talkie that can work in an explosive atmosphere.  ...

Read more  explosion-proof walkie-talkie