Tag Archives :N

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.  ...

wireless communication also transmits information through antennas, except that it transmits electromagnetic waves that carry useful information. The figure below is an example of mutual communication between a mobile phone and a base station.  ...

For radio amateurs, they use Yagi Antenna to extend racio communication range. Nowdays, many amateurs use Yagi antenna to receive the signals from the satellite.  ...

dPMR is a different protocol than DMR. So Ailunce HD1 is not able to listen dPMR446.  ...

The signal report of an amateur station consists of "R" (Readability, which is the clarity of the signal) that represents the intelligibility of the signal, "S" (Strength, that is, the size of the signal) that represents the strength of the signal, and "T" (Tone) that represents the tone of the signal , That is, the tonal quality of the signal) is composed of three parts, so the signal report is often called "RST".  ...

In my country, there also will have a QSO activity via digital repeater or MMDVM Hotspot  every Saturday. To promote hams communication from different provinces, on this digital activity, not only use DMR Radio, but also YSF, C4FM , P25 radio and Wires-X.  ...

Simple operation makes it easier for new scholars to get started. Powerful function makes experienced hams also love it very much.  ...

An easy-to-use, no complicated adjustment, novice antenna. If you don’t have a roof to set up a Ⅴ antenna and inverted V antenna. But you have a balcony, come on to try this 10 band shortwave balcony antenna.  ...

China launches the last satellite in the BeiDou Navigation Satellite System (BDS), a 30-satellite navigation system, from Xichang Satellite Launch Center in southwest China's Sichuan Province.  ...

antenna SWR, antenna gain, and Directionality are reference factors for judging the quality of an antenna.  ...