Squelch and Squelch Level

People in the use of wireless walkie-talkie often hear the background noise, squelch, refers to the radio in order to solve the call quality and noise problems, and design of the squelch circuit or squelch function. Squelch function has a different squelch level, according to the actual situation to adjust themselves. Noise characteristics Wireless walkie-talkie…

What is standing wave ratio?

Standing-wave ratio (SWR) is a mathematical expression of the non-uniformity of an electromagnetic field (EM field) on a transmission line such as coaxial cable. Usually, SWR is defined as the ratio of the maximum radio-frequency (RF) voltage to the minimum RF voltage along the line. This is also known as the voltage standing-wave ratio (VSWR).…

Advantages of wireless communication

Communications can be simply divided into a wired (including erecting cable, cable or leased telecommunications Line) and wireless (radio transmission into the establishment of a dedicated line) two big way. Compared to establish a dedicated wireless transmission have less investment than the other way, the opening and operation and maintenance quick and simple, the disadvantage…

2-Way Radio Definitions

Two-Way Radio – A two-way radio is a hand held device or transceiver can both transmit and receive voice communication.  Broadcast Environment’s use receivers meaning one can receive voice but not transmit communications. Other terms for Two-Way radios include; walkie-talkies, hand held radio or handie-talkies. The three types of Two-Way radios are; hand-held, mobile, and stationary or base.…

How to Be a Ham

Amateur Radio In my opinion, the ultimate in radio communication is Amateur Radio, also known as Ham Radio. Ham isn’t an acronym,but an old-school term originally thought to have been derived from radio operators with poor or “ham-fisted” skills.It consists of a series of radio frequency bands designated internationally for public, non-commercial use. Various types…