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What is the Difference Between Simplex and Repeater Channels?

From the beginning when I learn the ham radio knowledge, There are two basic ways to using your radio. One is simplex, the other more popular way is using a repeater. I often get confused how to operate a radio connect to a repeater, the shift frequency downlink and uplink.Today, let us learn the difference between simplex and repeater.    ...

Read more  Simplex and repeater,  the difference between simplex and repeater

Which Retevis DMR Radio Supports APRS

Do you know which Retevis DMR Radio supports APRS feature?  ...

Read more  DMR APRS,  Retevis DMR Radio,  APRS radio

How to do when your RT3S locked on 150Mhz frequency

Help My RT3S wont key up below 150Mhz and 450Mhz, how do I get it back to normal frequency?   ...

Read more  RT3S lock to 150Mhz,  Retevis RT3S

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