A CB Radio (Citizens Band Radio) is meant for two things: Capturing radio frequency signals that are converted to electrical signals by the receiver, and taking electrical signals from the transmitter and converting them into radio-frequency signals. Adding tuning into play, an antenna needs to radiate radio-frequencies. This is the most effective when the length of the antenna exactly matches the wavelength of the transmitted radio frequency.
There is a proper formula to determine the desired length for the antenna:
Wavelength (in feet) = 984 / frequency (in megahertz)
With modern CB transceivers having approximately 40 channels each corresponding to a different frequency. It's not practical to have a separate antenna for each frequency, so antenna designers have to compromise, usually picking a frequency in the middle of the spread and choosing the antenna length to correspond.
No comments:
Post a Comment