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we get a very imprssion experience how to receive SSTV image with AilunceHD1.  ...

Frequency reverse means reverse radio transmit frequency to receive frequency. and at the same time exchange the CTCSS tone.   ...

In amateur radio world, one of ham's favorite radios is the SDR transceiver. So what's SDR radio? What is the difference between SDR and traditional transceiver ? what are advantages and disadvantage of SDR? Let's study together.  ...

The specification of walkie-talkie is an important reference for us to know whether it meets our needs. For example, the working mode of walkie-talkies is often marked with words such as F3E or F2D. Do you know what it means? Today let's study together.  ...

In order to improve communication quality and communication efficiency of CW, people have invented and used various abbreviations in long-term practice, which is to abbreviate frequently used words and sentences in communication to one or a few letters. It has evolved and perfected and formed the abbreviation that is now commonly used internationally. There are two common rules for commonly used English abbreviations.  ...

For CW morse key, now we most commonly use the double paddle automatic morse key. In fact, in addition to the automatic double paddle button, there are three types of morse keys including straight key, single paddle morse key and semi-automatic morse key.  ...

NVIS is short for Near Vertical Incidence Skywave. It's short-range near field communication method which is widely used in military communications, nearby emergency rescue and other fields. NVIS and DW are the main methods of shortwave communication, so what is the difference between them?  ...

It was a very unusual situation, hams use their U/V handheld to help quickly find the missing kids.  ...

Both the antenna analyzer and the standing wave meter can be used to test the standing wave of the antenna feeder system, but the functions and characteristics of them are also quite different. So, should we choose an antenna analyzer or a standing wave meter?  ...

Retevis RT85 is an analog radio which comes with emergency alarm function. Its frequency range is VHF 136-174Mhz and UHF 400-470Mhz. For the first time use full dot matrix screen.  ...