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How to load DMR contacts database in Retevis RT72

Retevis RT72 support upload 13,0000 DMR contacts. This blog learn how to load 13,0000 DMR database into your RT72  ...

Read more  Retevis RT72,  RT72 database

How to debug the Antenna after installed?

After we complete , it needs to be debugged. The purpose of antenna debugging is to make the antenna system resonate at the transceiver frequency by trimming the length of the antenna element. Match the impedance of the antenna system with the transceiver impedance of the radio. Debugging generally uses standing wave meter, power meter or antenna analyzer.  ...

Read more  Antenna Debug,  Amateur Radio,  Ailunce

Retevis RT44 The Ultimate Outdoor Networking Device

Retevis RT44 with GoHeart app is the ultimate outdoor networking device with a user-friendly interface that allows users to get help, track friends and talk to them without needing internet or telecommunication signal.  ...

Read more  Ultimate Outdoor Networking Device,  Retevis RT44

Repeat the problem "Please check connection" when upgrade HD1 firmware

When updating the HD1 firmware, how to do if you get " please check connection" Error.  ...

Read more  HD1 firmware update tips

A New Professional Outdoor Communication Tool Retevis RT44 is Coming

No matter climbing, canyoning, country sports, cycling, ,wilderness-survival-bushcraft, extreme sports etc. communication is very important. Retevis according to the needs of outdoor enthusiasts design a outdoor communication tool RT44. It can meet all your outdoor needs.  ...

Read more  Professional Outdoor Communication Tool

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