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Category Archives :Radio knowledge

Is it possible to receive other digital modes like P25 on AilunceHD1

The DMR is not compatible with P25 systems. so it is impossible to receive other digital modes like P25 on AilunceHD1.  ...

Read more  P25 system,  DMR system,  P25 vs DMR

What's VFO?

At present, many amateur radios on the market not only have CH mode but also VFO mode. CH mode is also called Memory mode. In the mode, all commonly used channels that have been programmed in software can be displayed. So what is the VFO mode?  ...

Read more  Amateur Radio,  VFO Mode,  Ailunce HD1

Will Rainy Days Affect the Quality of Amateur Radio Communications?

When rainy days the commonly used bands of 2 meters and 70 centimeters the quality of amateur radio communications have been greatly affected. In the 2 meter band, the loss may reach 6dB.  ...

Read more  amateur radio communication

Definition of letters used for short wave radio transceiver equipment

We will see a variety of English abbreviations on various radio transceiver equipment. Today we will talk about the meaning of some of the English names used on HF shortwave radios.  ...

Read more  AilunceHS2,  HF Shortwave radio

How to Choose a Suitable Radio Antenna?

Antenna is a very important component of radios. The antennas primary function is to transmit and receive clear signals between multiple radios. It is safe to say that an efficient radios will require antennas to operate properly.  ...

Read more  Choose a Suitable Radio Antenna

Great Circle Maps for amateur radio

We know that the shortest distance is straight line between two points. but it's often not simple when hams communicate with each other from around the world. Because it's not the shortest distance geographically if we connect two points directly on world map, we need to select the right direction of antenna to achieve the better communication effect. Especially for directional antennas, such as Yagi antennas. we must rely on the great circle Maps.  ...

Read more  Great Circle Maps,  amateur radio,  Yagi antenna

what programming interface of your radio?

For ham, it is very interesting to do some simple DIY to achieve some of your own special demands. Therefore, it is a simplest need to know the function of programming interface. Today we will take a look at several programming interfaces of Retevis and Ailunce.  ...

Read more  AmateurRadio,  program,  interface

What's SDR radio?

In amateur radio world, one of ham's favorite radios is the SDR transceiver. So what's SDR radio? What is the difference between SDR and traditional transceiver ? what are advantages and disadvantage of SDR? Let's study together.  ...

Read more  AmateurRadio,  SDR Tranceiver

Common types of radio emissions

The specification of walkie-talkie is an important reference for us to know whether it meets our needs. For example, the working mode of walkie-talkies is often marked with words such as F3E or F2D. Do you know what it means? Today let's study together.  ...

Read more  Radio emissions,  ITU

NVIS:Guarantee of Short-Wave near field communication

NVIS is short for Near Vertical Incidence Skywave. It's short-range near field communication method which is widely used in military communications, nearby emergency rescue and other fields. NVIS and DW are the main methods of shortwave communication, so what is the difference between them?  ...

Read more  AmateurRadio,  NVIS,  ShortWave