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The squelch switch is a function specially designed to solve the contradiction between the call quality and noise of the wireless walkie-talkie.  ...

The signal report of an amateur station consists of three parts: "R" representing the discernibility of the signal, "S" representing the signal strength, and "T" (Tone, the quality of the signal) representing the signal tone, so the signal report often becomes " RST".  ...

program Retevis RT85 by chrip  ...

if you want to expand the communication range between your teams and you do not want to connect to the public repeater, how to do?  Now you can consider Retevis RT97P protable digital and analog repeater.   ...

Retevis RT85 is an afforable dual band two-way radio for beinngers. It is a 5W VHF and UHF handheld ananlog radio with 200 memories channels computer programming and dual VFO.  ...

With the continuous improvement of walkie-talkie functions, we have seen walkie-talkies in different industries and fields. Whether it is a sudden epidemic or daily communication scheduling, we have found that the role of walkie-talkies in medical scenarios is becoming increasingly prominent.  ...

Retevis RT85 as a ham ananlog radio is very popular in the market now. It has dual band,dual standby,dual display. It use the DOT-MATRIX LCD display. Every function will shows their icons on the screen.   ...

RTLSDR is an innovative invention of the DVB-T USB receiver, the complete software-defined radio.  ...

Superheterodyne receiver is to convert the high-frequency signal received by the receiver into an intermediate frequency signal through a mixer and then output the intermediate frequency signal to the detection circuit. This intermediate frequency signal is a fixed difference signal obtained by subtracting the local oscillator frequency and the received signal frequency​.  ...

The local oscillator frequency is a term often mentioned in the superheterodyne receivers. The local oscillator frequency is generated by the local oscillator circuit. There is a local oscillator in the superheterodyne receiver, which can output a stable high-frequency electromagnetic wave, which is mixed with the received high-frequency signal to produce a different frequency. This difference frequency is Intermediate frequency, that is heterodyne, which in turn forms superheterodyne receiver.  ...