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Why do we need VSB modulation

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

Read more  Amateur Radio,  VSB

Retevis RT3S Supports Flashing Open Source Firmware OpenGD77

Retevis RT3S supports flashing open source firmware OpenGD77  ...

Read more  RETEVIS RT3S,  OPENGD77

【ARRL News】2022 Year ARRL 10-Meter Contest

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

Read more  10-Meter Contest

How to choose the microphone of Ailunce HD1

How to choose the microphone for Ailunce HD1  ...

Read more  Ailunce HD1,  Microphone

How to display channel name on Retevis RT72

How to display channel name on Retevis RT72  ...

Read more  Retevis,  DMR

Why Ailunce HD1 has no prompt tone when receiving SMS?

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

Read more  Ailunce HD1,  SMS,  Amateur radio

How to set DTMF of Retevis RT95

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

Read more  Ham radio,  mobile radio

Two Way Radio Channel Busy Lock Function

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.  ...

Read more  Busy Channel Lock