How Antenna Works for Radio

radio antennaPeople are fond of tuning in to the radio. Some of them prefer to use this medium to be entertained either by listening to music or by getting informative news. Because having an access to a radio is easier than any other means. You can bring a radio anywhere because it is handy and portable. You will just have to make sure to look for an excellent signal spot to tune in to a channel. With this, you need to have a device called radio antenna which will help you find an excellent signal spot and tune in to several radio channels.

This device is intended for two functions. One is to gather radio frequency signals which are used to convert to electrical signal by the receiver. The receiver receipts these electrical signals from the transmitter and translates them into radio frequency signals.

Its second function is where fine tuning comes into the process. These antennas have to radiate radio frequency signals. This process is perfectly executed when the length of the antenna accurately complements the wavelength of the emitted radio frequency.

Getting an excellent signal requires a full length antenna for your radio. A specific formula is used to determine the correct measurement of the antenna. It is wavelength (measured in feet) = 984/frequency (in megahertz).

The citizens band (CB) part of the spectrum starts at 25.01 megahertz. With this measurement, the full wavelength antenna would be more than 39.34 feet long. So it will not be convenient for you to connect it to your bumper. This is the reason why people prefer to use CB antenna.

There are 40 channels on the new CB transceivers. Each channel corresponds to a specific frequency. With this, it is not convenient and rational to have separate antennas for each channel. This is the reason why antenna manufacturers designed an antenna that will correspond to each frequency. It is a single device that can pick up several channel frequencies depending on the antenna length.

Each antenna has the quality of impedance or the resistance to electrical flow. With this characteristic, 100 percent of the electrical power transmitted to the antenna is converted to radio intensity and emitted to the atmosphere. On the other hand, if the impedances are not properly synchronized, some of the electrical energy transferred to the antenna will not be converted to radio energy but will be returned back to the feed line of the device. And this energy which is returned to the feed line causes standing waves of electrical strength in the feed line. It will be stagnant and will cause frequency traffic. This frequency traffic hinders you from getting a good channel reception.

To adjust the frequency of the antenna, you can use an SWR meter connected between the source and the receiver. You have several options to tune in to a specific channel depending on the kind of SWR meter you are using. You can use a button on the device to tune in on a channel. Other devices use a microphone on the CB transceiver to produce a signal. If the SWR meter is more than the higher channels, try to decrease the length of your antenna.

There are a lot of factors that can affect the impedance of an antenna. These include electrical ground of the device, the configuration around the antenna or any other devices near the CB transmitter. All of these factors affect the quality of the antenna in terms of searching for a perfect signal frequency. There are lots of techniques which you can utilize to properly tune up your antenna. You will just have to bear in mind that everything should start with having the best quality antenna for your radio.

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