What is SSTV?Slow Scan TV, or SSTV, is a term used to describe the transmission of pictures by radio. It’s comparable to early television systems or fax machines. In as few words as possible, this technique uses sound to generate and exhibit an image sent by another source. It’s primarily utilized by amateur radio operators who … Read more
A cavity filter is a form of a resonant circuit that allows only specific frequencies to go through. Notch filters, in general, are the type of filter discussed here. “Cavity” is just a name for the space inside of the filter that traps or releases energy. Table of Contents What are Cavity Filters used for?Most cavity … Read more
What is ITU Phonetic Alphabet?What is the purpose of ITU Phonetic Alphabet? Who created it? Why do we use the ITU Phonetic Alphabet nowadays? The HistoryITU phonetic alphabet first appeared in 1913 as a set of six audio frequencies, however, the pronunciation was only based on the English language. In 1955 first major revision took place and now … Read more
If you’re new to CB Radio and are curious about the CB radio brands, we’ve compiled a list of CB Radio manufacturers and their respective market share by brand popularity.The 19 CB Radio Brands Broken Down By Popularity Table of Contents The 19 CB Radio Brands Broken Down By PopularityCobra CB Radios:Uniden CB RadiosStryker CB … Read more
Antennas are elements that can receive or transmit radio waves. Antenna types vary according to the frequency of the radio waves they are designed for, among other things.Generally, there are three large groups of antennas: directions, semi-directional and Omni-directional antenna. Most antennas fall into one of these three groups. Table of Contents Directional AntennaOmni-Directional Antenna: Semi-Directional Antennas:The … Read more
Gain is the amplification of an audio signal. The amount of amplification is measured in voltage. So, if your audio source has 1 volt and you are amplifying by +10 db , then your output will be 11 volts (1 x 10 ). You need to amplify to match the output of your source. For example, if you have … Read more
The term Noise Temperature has two rather simple yet distinct meanings in the RF community. This article focuses on its use as a measurement of noise power, whereas another post will explore how it relates to wireless link performance. Conceptually, Noise Temperature is not much different than other temperature scales we are familiar with (Celsius, Fahrenheit). … Read more
As a rule of thumb, antenna gain is the measure of how well an antenna converts RF power from a transmitter to an electrical signal at its output terminals. Distance is generally referred to as transmission line loss or the attenuation of RF signals over a given amount of cable. There is certainly some correlation between … Read more
Ever turned on your walkie-talkie and a very odd and annoying sound come through? This is radio squelch.What does “Squelch” mean?Squelch is the noise reduction system of a Walkie-talkie. The squelch level is used to control unwanted background noise and prevent false triggering from noise when no one is transmitting. It’s important to set the squelch … Read more
