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Ailunce HD1 review by Rowen Warren（KE0RTL）  ...

A good review of Ailunce HD1 by Michael Martens KB9VBR  ...

Ailunce HD1 Real World Range Test,  ...

Emergency rescue communication refers to the communication activities carried out when some major emergencies (such as all kinds of major natural disasters, large-scale terrorist attacks, etc.) occur, resulting in a large number of casualties and heavy losses of social property.  ...

CQ World Wide WPX Contest SSB is coming on this weekend March 30-31, 2019.  ...

Ailunce HS1 SSB HF SDR HAM Transceiver 0.5MHz-30MHz HF SDR Transceiver  ...

Amateur radio operators exchange QSL cards to confirm two-way radio contact between stations. Each card contains details about one or more contacts, the station, and its operator. At a minimum, this includes the call sign of both stations participating in the contact, the time and date when it occurred (usually specified in UTC), the radio frequency or band used, the mode of transmission used, and a signal report.  ...

As an electromagnetic transducer element, the position of the antenna in the entire radio communication system is very important. The quality directly affects the distance and effect of the transmission and reception. In other words, there is no radio communication without the antenna.  ...

We know the VSWR of the antenna system is close to 1:1. If it is close to 1:1, it is good. I often hear this question: But what if I can't reach 1? If the standing wave ratio is as small as a few, is the antenna qualified?  ...

Alphabet interpretation is widely used in amateur radio communication. Due to the low output power of amateur stations and the complicated factors of radio wave propagation, the distortion or fading of the received speech signal is serious, which affects the analysis and identification of information.  ...