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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.  ...

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？  ...

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?  ...

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?   ...

Retevis RT73 temperature-controlled cooling fan can control the air pressure and air volume of the fan through the temperature change in the vehicle-mounted station to achieve the effect of energy saving.  ...

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.  ...

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.  ...

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.   ...

Which NGP antenna suitable for RetevisRT73? MR200 U/V Dual Band NGP Antenna and NMO Mount  ...

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.  ...