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Scanning for CTCSS and DCS Tones/Codes on Retevis RT85

As we all known, many analog repeaters have their own frequency and CTCSS Tone, and the frequency maybe always the one many people already remembered, but not the CTCSS/DCS tone. So now, if your radio can scan for a CTCSS/DCS tone, that will be very useful. Today, let us see the CTCSS/DCS scanning on Retevis RT85.   ...

Read more  Retevis RT85 CTCSS/DCS SCANNING

What's the difference between Mechanical life and Electrical Life?

Recently we're doing the research of Ailunce FS01 footswitch for PTT, and the words including Mechanical life and Electrical life appear. Do you know what's the difference between Mechanical life and Electrical Life?  ...

Read more  Foot switch PTT,  Mechanical life,  Electrical life

What's the function of internal battery of Ailunce HD1

Do you know why the time of your Ailunce HD1 won't stop even though you turn off your radio? it's because of the internal battery. In addition to time, do you know what functions the internal battery affects?  ...

Read more  Amateur Radio,  internal battery,  Ailunce HD1

What's Selcall

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.  ...

Read more  Amateur radio,  Selcall

What's the UTM system?

UTM is short for Universal Transverse Mercator Grid System (UTM). that is said the universal transverse Mercator grid coordinate system, which is a flat rectangular coordinate.  ...

Read more  Amateur Radio,  UTM,  GPS system

How to do if Ailunce HD1 is killed by unknown person

We know, if we have two Ailunce HD1, we can kill and wake each other remotely, but how to wake up Ailunce HD1 if it is killed remotely by a stranger?  ...

Read more  Amateur Radio,  Ailunce HD1,  Kill

Why can't my HD1 set the RX frequency to 447.1875MHZ?

Do you know why can't your UV dual-band radio HD1 set the RX frequency to 447.1875MHZ?  ...

Read more  Amateur Radio,  Ailunce HD1

How to manually program Retevis RB22 talk to Ailunce HD1

Although Retevis RB22 is a semi-keyboard DMR radio, it also supports programs manually.  ...

Read more  Retevis RB22,  Ailunce HD1

How to judge whether the antenna is compatible with the walkie-talkie

How to judge whether an antenna is compatible with your radio? Generally speaking, how to judge whether an antenna can make your walkie-talkie achieve better reception?   ...

Read more  walkie talkie antenna