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Why is necessary to set the squelch level?

Walkie-talkies communicate with each other by radio signals. Different from wired communication, background noise will inevitably appear in radio communication. This kind of noise is tiresome and causes auditory interference and fatigue to users. The purpose of setting the squelch level is to control the influence of back noise.  ...

Read more  Squelch level,  Ailunce HD1

What's QPSK modulation?

QPSK is short for Quadrature Phase Shift Keying or called four-phase shift keying. and it is a digital modulation. Do you know how QPSK works?  ...

Read more  QPSK,  Modulation,  Amateur Radio

How to set up FM satellite communication channels

The common satellites use FM transponders, so a simple FM walkie-talkie can realize FM satellite communication. So what should be paid attention to when setting up an FM satellite communication channels?  ...

Read more  Amateur Radio,  FM satellite

How to set Ailunce HS1/HS1 PLUS in WSJT-X

Ailunce HS1/HS1 PLUS is an SSB HF SDR ham transceiver, so we can use some computer third-party software, such as WSJT-X,and so on. today we'll show some key settings for Ailunce HS1/HS1 PLUS in WSJT-X.  ...

Read more  Ailunce HS1,  WSJT-X,  SDR Tranceiver

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

What's the difference between scan and scanner of radio?

For hams, the scan is a very common and practical function. With the continuous development of amateur radio, the new word scanner has appeared. So what is the scanner, and what is the difference between scan and scanner?  ...

Read more  Scan,  scanner,  Amateur Radio

How to initialize Retevis RT23?

Retevis RT23 is a U/V dual band handheld amateur radio station with dual PTT, dual display, and dual standby that supports cross-band repeater. The amateur radio allows the hams to program it. When the walkie-talkie cannot work normally due to wrong operations, we can try to restore the factory settings, also known as initialization. RT23 supports two methods to initialize it, one is shortcut key initialization, the other is software initialization.  ...

Read more  Retevis RT23,  Ham radio,  initialization

What's LORA?

Lora is short for Long Range. It is a low-power LAN wireless standard created by Semtech company. Its biggest feature is that it can travel farther than other wireless methods under the same power consumption condition, achieving low power consumption and Long-distance unity, it is 3-5 times longer than the traditional radio frequency communication distance under the same power consumption.  ...

Read more  Lora,  Long range,  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

Why does Retevis RT73 appear No menu item error?

Recently we received customer feedback. After trying to make RETEVIS 73 codeplug and writing into radio successfully, they received No menu item when entering the setting menu. but after trying to restore the factory, the menu shows normally. Why is this?  ...

Read more  Retevis RT73,  No menu item