4/20/2023 0 Comments Radio transistor![]() ![]() If the radio has battery power, the warning will even be transmitted if the radio is turned off. Weather alerts: Some AM radios provide automatic alerts for emergency weather situations.(Only use AM radios specifically designed for this purpose in the shower or bath!) Waterproof protection: Some AM radios are waterproof and can be operated in any kind of weather or even the shower. This feature is similar to that found on a car radio. Preset stations: Larger AM radios may allow you to program certain buttons to favorite radio stations. You might have to press a lever or button to switch over to the FM radio band. This isn’t as precise as digital AM.įM signal: Nearly all AM radios can also pull in FM signals. This dial moves a small bar across a window with the frequency numbers printed on it. Tuning options: Some tuners use a dial that you turn to tune into the signal you want. ![]() If you have a digital tuner, the screen will show you the name of the radio station, and it may even list the name of the current song or program. Some radio stations now transmit both analog and digital signals, so choose an AM radio with a digital tuner if you want to pick up the digital signals.ĭigital screen: Some AM radios have a small screen that shows you the frequency so you can precisely dial in the desired radio station. Analog signals travel farther, but digital signals are clearer. Headphone jack: If you want to listen to the AM radio in private, a headphone jack in the unit is a must.ĭigital tuner: All AM radios have an analog tuner, but only some have a digital tuner. The telescopic antenna collapses for storage. This is a great feature for emergency situations or when you’re camping and don’t want to take extra batteries.Įxtendable antenna: Most AM radios have an antenna that extends from the radio for better signal reception. Hand crank: Some small AM radios have an additional option for generating power by using a hand crank. Power adapter: With larger AM radios, it’s helpful to have the option of running it from a power adapter plugged into an outlet. ![]() Larger radios may run from several C or D batteries, which cost more to replace. Small radios may use one or two AAA, AA, or 9-volt batteries. AM radios set themselves apart from each other through the extra features they offer.īatteries: Most AM radios run on alkaline batteries, although some use rechargeable batteries. AM radio featuresĪlthough all AM radios can pull in over-the-air radio signals in the 535 kHz to 1705 kHz band, these units can also do much more. The AM radio decodes the signal and turns it into an audio signal that plays through the speaker. The radio then ignores all other radio signals it receives. To pick up the AM radio signal you want, you dial the tuner to the proper frequency, such as 1620 kHz. Others have a tiny antenna built into the radio body that you may never see or notice. Some have a silver-colored telescopic antenna that extends out of the unit. Reception: All AM radios have an antenna built in. And with the right atmospheric conditions at night, some AM radio signals can even travel 1,000 miles or more. This signal may travel a few dozen or a few hundred miles during the day, depending on the strength of the transmitter. This is where AM radios get their call numbers, like 590 or 1620. AM radio signals use frequencies between 535 kHz and 1705 kHz. Transmission: The station then uses an transmitter to broadcast the signal out to the world on a particular frequency. Modulation: The AM radio station encodes information (in the form of spoken audio or music) on a radio wave in a process called modulation. You may be surprised by how much has to happen before you can hear your favorite team’s baseball game on an AM radio. Radio station KDKA in Pittsburgh is credited with the first commercial AM radio broadcast, in October 1920. ![]()
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