in order to avoid this loss, a technique was chosen, which is a compromise between DSB-SC and SSB, called Vestigial Sideband (VSB) technique.  ...

Retevis RT3S supports flashing open source firmware OpenGD77  ...

 ...

For Amateurs worldwide to exchange QSO information with as many stations as possible on the 10 meter band.  ...

 ...

How to choose the microphone for Ailunce HD1  ...

How to display channel name on Retevis RT72  ...

Why Ailunce HD1 has no prompt tone when receiving SMS？  ...

There are two ways to set DTMF of Retevis RT95, including set in the software or on the radio.  ...

Channel Busy Lock is a privacy feature that keeps communication lines open by preventing radios from listening or transmitting through conversations outside their talkgroup. Whenever the radio is not allowed to talk, you will hear a busy tone if you try to transmit.  ...