Amateur radio operators have a long and storied history across the globe and are often referred to as “ham” radio operators. Defined as a “duly authorized person interested in radioelectric practice with a purely personal aim and without pecuniary interest and differentiated from commercial broadcasting, public safety (such as police or fire), or professional two-way radio services (such as mariti...
Imagine how cool it would be if you could make your own ham radio antenna. After all, externally，there’s not that much of a difference between a ham radio antenna and an old TV antenna, is there? Well, you may be surprised to know that, with a bit of craftiness, you can transform a TV antenna into a functioning ham radio antenna. It just takes a bit of know-how. Cable quickly made TV antennas an o...
Amateur radio frequencies are allocated by the national telecommunication authorities. Each frequency differs in each location in every country depending on its bandlength. Frequencies in each city differ but some frequencies can reach multiple locations if it is strong enough. However, the International Telecommunication Union is the primary authority that manages the radio spectrum. This include...
How far can dual band radios communicate, 30 km? This is one of the most common questions asked by newcomers, but they often do not get a satisfactory answer. This is a complex question that requires a number of factors to be considered. Obstacles are a very important factor in communication distance. In the city, two handheld radios may only be able to talk for 1-2 km, whereas in open areas, they...
Radio beginners often ask questions about CTCSS (Continuous Tone Controlled Squelch System) , thinking that they are vague and difficult to grasp. So today we will talk about what CTCSS is. CTCSS is a technology that adds frequencies lower than the audio frequency (67Hz-254.1Hz) to the audio signal and transmits it together. The purpose is to check whether the signal is legal and whether to respon...
With the development of wireless communication technology, two way radios have become a supporting communication product for more and more hotels, so as to enhance the coordination of the hotel's work and promote the hotel's performance up. So, what kind of radios are suitable for the hotel industry? A stable and efficient internal communication system is a must for a hotel that values quality of ...
With the vigorous development of maritime industry, the importance of marine radio communication has also been paid more and more attention. Some people may have less exposure to this area, but to give you a few examples, such as the rescue of the Titanic, the rescue of the Jiang Yalun, etc., marine radio communication has played a crucial role. Today we are going to talk about this topic. 1....
Some green hand hams may have questions when they see the “IPXX” logo on the box of two-way-radios, what is the protection level of the radio? The IP(INGRESS PROTECTION) protection rating system is defined by IEC(INTERNATIONAL ELECTROTECHNICAL COMMISSION). It classifies electrical appliances according to their dust and moisture resistance characteristics. The IP rating of a radio or oter device is...
