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Category Archives :Radio knowledge

What is the Difference between CTCSS and DCS on Two-Way Radios?

When using two-way radios or walkie-talkies, we all use CTCSS/DCS or Motorola system PL tones or DPL.  It is divided into CTCSS and DCS. Both CTCSS and DCS are all used on analog two way radios. Do you know what is the difference between CTCSS and DCS?   ...

Read more  CTCSS and DCS,  difference between CTCSS and DCS

The Actual Communication Distance of the Digital Walkie Talkie

Because ultrashort wave communication is a line-of-sight transmission method, data signals are affected by buildings, hilly terrain, and trees, and electromagnetic waves are blocked and affected, which affect the facts.  ...

Read more  Communication Distance

What Role does Shortwave Communication play in Wireless Communication?

Shortwave is the originator of radio. When the radio was invented, the transmission method was shortwave. In modern times, the frequency band used by radio has expanded to ultrashort wave, microwave, and even higher, but short wave still plays an extremely important role.   ...

Read more  Shortwave,  emergency communications

Comparison of Amateur Radio Digital Voice Modes

Understanding the different modes of digital voice can enable amateurs to clearly understand the bandwidth and transmission rate used by the digital voice mode. It can also help us understand which mode is easier to get started and which mode should be experienced in the future.  ...

Read more  Digital Voice,  DMR,  C4FM,  D-Star

What's the baud Rate?

The baud rate is the number of code symbols transmitted per second. It is a measure of the symbol transmission rate. For electronic communication, the baud rate is the modulation rate, which refers to the rate at which the effective data signal modulates the carrier, that is, the number of times the carrier modulation state changes per unit time.  ...

Read more  Baud Rate,  Amateur radio

How does the receiver process the radio signal?

The radio receiver is a device used to receive radio signals. It can convert the RF signal received by the antenna into a baseband signal. Usually, we know the frequency of RF is very high but the baseband frequency is lower, so it requires the receiver to process. According to different processing ways, radio receivers can be divided into direct-emitting radio receiver amplifiers and superheterodyne receivers.  ...

Read more  Radio receiver,  Amateur Radio

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