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How to set Analog APRS on Retevis RT73

please make sure your RT73 firmware version above than the 20210329 version. Because the APRS feature was added on 20210329 version firmware.  ...

Read more  Retevis RT73 APRS

How many ISS SSTV Images have you Received?

ARISS report there will be an “Amateur Radio on Shuttle, Mir and ISS” Slow Scan TV (SSTV) event from June 21-26. Transmissions from the International Space Station will be on 145.800 MHz FM using PD120.   ...

Read more  ISS SSTV,  Slow Scan TV (SSTV)

Why is the Mobile Radio Easy to Burn the Power Amplifier?

"If the antenna feed is not well-matched, it will burn the power amplifier." That is, if the standing wave ratio is high, there will be the risk of burning the power amplifier.  ...

Read more  SWR,  power amplifier

The Benefits of Using Temperature-controlled Fans in Mobile Radios

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.  ...

Read more  Temperature-controlled Fan

The SQL and SQL Level of Walkie Talkie

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.  ...

Read more  squelch,  squelch level

How to set the time of Retevis RT73

Some customers don't know how to set the time of Retevis RT73. Do you know how to adjust the time? There are three ways to adjust the time of Retevis RT73.  ...

Read more  Retevis RT73,  Time setting,  Mobile radio

Codeplug Editor for Retevis RT73

David Bell who create a codeplug editor for Retevis RT73, it is also beta version.  ...

Read more  RT73 codeplug editor,  RT73 CPS editor

What is the difference between roaming and scanning of the walkie-talkie?

Roaming refers to setting the radio to automatically move between them according to which repeater has a strong signal.  ...

Read more  Roaming,  Scanning

Why is necessary to set the squelch level?

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.  ...

Read more  Squelch level,  Ailunce HD1