Category Archives :Radio Function

Selcall is short for Selective calling. It is a type of squelch protocol used in radio communications systems, in which transmissions include a brief burst of sequential audio tones.  ...

Retevis RT73 mobile radio and Retevis RB22 Semi-keyboard UHF DMR Radio are both have the roaming function.  ...

When we want to test our radio and can't find someone to help us, we can set the parrot channel to do the Echo test. but sometimes the parrot test has no response, why?  ...

Busy Channel Lock-out feature often abbreviated to BCL on two way radios. But it depends on the different radios, on some radio it says BCL, this is also commonly referred to as TX Inhibit on some other radios. For example, on Retevis RB17P, it says "Busy Lock". but on Ailunce HD1 it says" TX Authority".    ...

We know Ailunce HD1 has the cross band transmit and receive function, and Retevis RT23 has the cross-band repeater function. do you know what is the difference between cross band transmit&receive and repeater?  ...

So now many vehicle-mounted stations are equipped with temperature-controlled fans, and the air pressure and air volume of the fans are controlled by the temperature changes in the vehicle-mounted stations to achieve the effect of energy-saving.  ...

The purpose of squelch is to strictly suppress the noise, but if the suppression is excessive, the weak call signal will also be restricted and cannot be received.  ...

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.  ...

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?  ...

What’s talk permit tone? This alert tone sounds after the Push-to-Talk (PTT) button is pressed and the radio is able to transmit on the channel. This is to prompt the user to begin speaking.  ...