Note: Due to COVID-19, the flights reduce and the delivery time may be delayed. Please understand. ×

+86 15093323284

 Longgang,ShenZhen, CN

Blog

What is a Repeater Frequency?

A repeater receives a signal on one frequency and simultaneously retransmits (repeats) it on another frequency. The frequency it receives on is called the input frequency, and the frequency it transmits on is called the output frequency.   ...

Read more  Repeater Frequency,  Downlink Frequency,  Uplink Frequency

How to receive SSTV images from the International Space Station ISS? 

How to receive SSTV images from the International Space Station ISS?   ...

Read more  SSTV,  how to decode sstv,  ARISS SSTV

Uncover the Secrets of the Antenna -3

Let's talk about another important concept of the antenna: polarization.  ...

Read more  Antenna,  Polarization

What do you need to know when installing an outdoor antenna

Why is your signal report of 50W radio not as good as the one just 5W radio? That's because in addition to the environmental loss, the power of the radio has a lot of loss in the antenna system. So many hams like to install them antenna outdoor to reduce antenna system loss. But what do you need to know when installing an outdoor antenna?  ...

Read more  Amateur Radio,  Outdoor Antenna

Uncover the Secrets of the Antenna -2

what are electromagnetic waves? how does the antenna send these electromagnetic waves out? how does the antenna realize the directional emission of electromagnetic waves? how do you measure the coverage and gain of the antenna's main lobe? After reading the article, you will understand.  ...

Read more  Antenna,  Electromagnetic Waves

Uncover the Secrets of the Antenna -1

wireless communication also transmits information through antennas, except that it transmits electromagnetic waves that carry useful information. The figure below is an example of mutual communication between a mobile phone and a base station.  ...

Read more  Antenna,  Electromagnetic Waves

What you need to know about SWR

SWR is short for Standing Wave Ratio. It's a parameter often used by hams to indicate if the antenna matchs with the transmitting radio. For SWR value, it has different effects on the built-in and external antennas. so there are differnt SWR standard required for antennas with the different working environment.  ...

Read more  SWR,  AmateurRadio

How to disappear the error when programming RT84

We got some customers feedback said they when they upgrade RT84 firmware or program, they will get an error" Excel Fail; firmware error; even no DMR users are displayed. Today I will tell you how to disappear these errors.  ...

Read more  RT84 FIRMWARE ERROR,  RT84 program error

Learn something about Yagi Antenna

For radio amateurs, they use Yagi Antenna to extend racio communication range. Nowdays, many amateurs use Yagi antenna to receive the signals from the satellite.  ...

Read more  Yagi Antenna

Tips for Beginners to Use DMR Hotspot

A hotspot that can help you to access the talk groups when you don't have a DMR repeater nearby.  Normally hotspots are capable of multiple modes as well, such as D-Star, P25, DMR+, YSF and NXDN… but we are only going to talk about DMR here.   ...

Read more  DMR Hotspot,  Tips for DMR Hotspot