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A repeater receives a signal on one frequency and simultaneously retransmits (repeats) it on another frequency. The frequency it receives on is called the input frequency, and the frequency it transmits on is called the output frequency.   ...

Let's talk about another important concept of the antenna: polarization.  ...

what are electromagnetic waves? how does the antenna send these electromagnetic waves out? how does the antenna realize the directional emission of electromagnetic waves? how do you measure the coverage and gain of the antenna's main lobe? After reading the article, you will understand.  ...

wireless communication also transmits information through antennas, except that it transmits electromagnetic waves that carry useful information. The figure below is an example of mutual communication between a mobile phone and a base station.  ...

Simple operation makes it easier for new scholars to get started. Powerful function makes experienced hams also love it very much.  ...

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.  ...

At first, we need to know what's the radio private call. The private call provides voice service between one individual user and another individual user. About how wo set private call on Ailunce HD1, there are two methods. We can follow the steps below to set it up.  ...

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

On 5th May 1940, Chinese amateur radio operators started “On air conference”. On 5th May 1947, the conference covered all the regions in China, it was the biggest on-air event.  ...

walkie talkies are an easy device for people of all ages to use, and a great way to help promote social distancing during the COVID-19 outbreak.  ...