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Common Types of Short-wave Antennas

The commonly used short-wave antennas are mainly classified into three categories, the vertical antenna (GP), the dipole antenna (DP), and the Yagi antenna (YAGI). In addition, there are frame type, diamond type, dish type, etc. Here we mainly discuss the first three types of antennas, among which the focus is on dipole antenna and its deformation.  ...

Read more  Antenna,  HF

How to import Digital Contacts into RT3S

When we are standing by one a band, and hear a voice. We want to know who is on the other side of the radio. which country, states, citry, or his callsign,name etc. To meet hams need, more and more dmr radio in the market support to save lots of contacts. When there is a call, the radio can show the caller's information. So we can know the caller clearly when we receive the signal.  ...

Read more  RT3S,  Contacts

How to Upgrade Retevis RT3S Firmware

RT3S dual band digital radio uses Digital Mobile Radio (DMR) Tier 2 Standard protocol. It is compatible with the popular MOTO TRBO series Tier I and II using standard encryption, It is also compatible with any existing analog two-way radio operating on the supported UHF and VHF frequencies for easy migration to digital technology.  ...

Read more  RT3S,  Firmware

How to Upgrade Retevis RT90 Firmware

Retevis RT90 is dual band DMR mobile radio. RT90 supports analog and digital mode, It provides dual band, dual standby, dual display, dual time slot, operating on both 400-480MHz UHF frequencies and 136-174MHz VHF at up to 50 watts VHF and 45 watts UHF.  ...

Read more  RT90,  Firmware

How to Upgrade Retevis RT82 Firmware

RT82 has two hardware version: GPS & Non GPS. If you radio is GPS version, you need to upgrade the GPS firmware. Otherwise, after you upgraded your radio will show white screen, snow screen, or other problems. So if you want to upgrade your RT82 firmware, make sure you choose the right firmware version first.  ...

Read more  RT82,  Firmware

How to Upgrade Retevis RT84 Firmware

Retevis RT84 is dual band dmr radio. We constantly update the RT84 firmware to meet the needs of customers. You can download it and install the .exe file on your computer  ...

Read more  RT84,  Firmware

What is the Balun

Balun, the full name is "balance to unbalance transformer". A balun is an electrical device that converts between a balanced signal and an unbalanced signal. Its essence is a transformer. Whose role in the circuit is to convert and match "an electrical signal that is relatively balanced with the reference ground" and "an electrical signal that is relatively unbalanced with the reference ground".  ...

Read more  Balun

Why you need a DMR Hotspot

A hotspot is simply an internet gateway to a particular DMR network (Brandmeister/TGIF). DMR Hotspots have become very popular due to the expansion of the Brandmeister Network in recent years.  ...

Read more  MMDVM hotspot,  DMR hotspot

Why Can not I Access the Repeater

One question we often hear from new hams (and maybe some not-so-new hams) is "why can't I get into the repeater?" There are many reasons why you can't get into a repeater so it is difficult to come up with a quick fix for all situations.  ...

Read more  Repeater

Basic Introduction for Analog (FM) Repeaters

Repeater, as the name implies, an FM repeater repeats your radio signal. It is just an amateur radio station that has been designed for the special purpose of retransmitting your signal instantaneously as it is received.  ...

Read more  FM Repeater