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Category Archives :Radio knowledge

What is a Repeater Frequency?

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.   ...

Read more  Repeater Frequency,  Downlink Frequency,  Uplink Frequency

Uncover the Secrets of the Antenna -3

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

Read more  Antenna,  Polarization

Uncover the Secrets of the Antenna -2

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.  ...

Read more  Antenna,  Electromagnetic Waves

Uncover the Secrets of the Antenna -1

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.  ...

Read more  Antenna,  Electromagnetic Waves

How to Call and Answer a CQ

Calling CQ is the easiest way to get on the radio and talk to somebody if you’re not turning around the band’s looking for someone else calling CQ, you can find a clear frequency and call CQ and see if someone out there hears you.   ...

Read more  how to CQ,  CQ CALL,  HAM RADIO CQ

The Signal Report of Amateur Radio

The signal report of an amateur station consists of "R" (Readability, which is the clarity of the signal) that represents the intelligibility of the signal, "S" (Strength, that is, the size of the signal) that represents the strength of the signal, and "T" (Tone) that represents the tone of the signal , That is, the tonal quality of the signal) is composed of three parts, so the signal report is often called "RST".  ...

Read more  RST signal report,  signal report of amateur radio

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