Tag Archives :N

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.  ...

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.  ...

In fact, the essence of wireless interference is electromagnetic interference. Therefore, in order to solve this problem, it is necessary to understand and analyze electromagnetic interference in order to find protective measures and effective methods for achieving electromagnetic compatibility.  ...

Manage Dynamic talkgroup and Static Talkgroup on Brandmeister.  ...

The 2019 NRR will be held 0000 UTC March 2 to 2359 UTC March 10. Registration for the 2019 NRR is NOW OPEN!  ...

Share the experience how I build a digital voice hotspot with MMDVM duplex board and Raspberry Pi  ...

It hasn't snowed for a long time this winter. There is heavy snow in our city these two days. I feel so excited. Today I take my HD1 out. it is a white world. I communicate with my friends with HD1 and really enjoyed it. Maybe the snow gives me another happy mood. I have taken some pictures and can't wait to share them with you.  ...