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Summary: An FM transmitter has an oscillator that generates the carrier RF signal. Frequency modulation takes place at the oscillator stage. The modulated signal is then sent through some filters and then finally amplified by a class C power amplifier, and then delivered to the antenna. An FM transmitter has an oscillator that generates a carrier signal on a desired frequency. But something like a voltage controlled oscillator is used so that the oscillating frequency can be changed by a modulating signal. When there is no modulation, the oscillator runs at it assigned frequency (called a center frequency). The voltage that is controlling the frequency at which it is running is constant. By applying the volage of a modulating signal to that "controlling" voltage, the frequency of the signal can be caused to vary above and below its assigned center frequency in a way that is directly proportional to the modulating signal. It is shifted above and below its assigned center at a rate proportional to the frequency of the modulating signal and at an amount proportional to the amplitude of the modulating signal. This takes up a bit of what is called bandwidth on the electromagnetic spectrum. The modulated FM signal appears as a "group" of frequencies around that center frequency with the sub-group of frequencies about the center being called the upper sideband, and that sub-group below the center being called the lower sideband. Almost all of the power in the generated signal is carried in these sidebands. This RF signal is them amplified by a high power RF amp, and the (now) high-powered FM signal is then sent via a transmission line to an antenna, from where the signal radiates into space. A link is provided to the Wikipedia article on FM modulation. Surf on over and check out the drawings and the little "moving pictures" to get a handle on FM. (No static at all!)
Wiki User
∙ 16y ago
Wiki User
∙ 11y agoFM transmitters are small audio outputs that connect to an audio FM signal then through a similar circuit provide the user with the ability to listen to the signal.
Wiki User
∙ 12y agoa pc fm transmitter is used to convert music files on your pc or laptop computer onto a radio or radio/cp player. It converts mp3 and avi files to radio format.
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What is the frequency swing of an FM broadcast transmitter when modulated to 60 percent?
The maxium frequency swing in FM is ± 75 kHz so 75 kHz x 60% = ± 45 kHz
What frequency range does the US use for FM broadcasting?
60hz frequency is being used in us
Block diagram of FM transmitter?
very rough: +---+ |##| +---+
What is a studio-transmitter link?
A studio-transmitter link (STL) is just that. It is the link between the studio and the transmitter. Let's look at one in action. KWIZ radio is a hip FM station with studios on the top floor of the insurance building downtown. They got a good deal on the space, and they like being downtown 'cause it makes them (and their listeners) feel more connected. Their transmitter is located on top of Mount Fritz, some 20 miles away. The transmitter is up there because real estate is a bit cheaper there, and from that spot it can hit (reach) a lot of territory. And the tower doesn't have to be super tall, either. Besides, there isn't any place downtown to put up an FM broadcast antenna. If the antenna was downtown, it would have to be super tall. And it couldn't get the kind of coverage KWIZ can get with a transmitter located up on a big hill. They want lots of area where their signal can reach out to and arrive at receivers. That translates into lots of listeners and lots of opportunities to sell radio ads and get lots of money for them because the station has lots of coverage/listeners. Dusty Rhodes and Sandy Beach share the mic on the morning show. They draw music from the tracks stored in the memory of the station's music computer. (Who still uses CD's?) When they play a tune, the signal is routed to the input of a microwave transmitter on the roof of the insurance building. The microwave transmitter takes that signal and uses it to modulate the microwave carrier, and then the modulated carrier is sent through amplifiers and finally to a microwave power amplifier. From there, it is sent into a waveguide (or, more probably, a length of heliax cable) and routed to the little microwave dish on that short mast on the roof. The dish is a parabolic reflector, and it may be anything from a foot or two across to half a dozen feet across, depending on the system used and the distance it needs to cover. (A meter in diameter would not be uncommon for something like this.) The microwave signal is then radiated from the feedhorn into the dish. From there it is reflected off the dish and goes where the dish is pointed. The transmitter's dish is pointed at a similar receiver dish up on Mount Fritz. That receiver dish (which is pointed at the transmitter dish) is often mounted on the tower that the FM broadcast antenna sits on. The microwave signal is collected on that second dish and reflected to the focal point to be gathered up by a horn positioned appropriately. There may be a low noise amplifier built right into the horn at the focal point of the receiver's dish. The microwave signal is then demodulated and music track recovered. Then that signal can then be used to modulate the FM transmitter, which is right there. The amplified signal goes out of the FM transmitter and into the transmission line which connects the transmitter to the antenna. The signal is being routed point to point from the studio to the transmitter. And that's the studio-transmitter link (STL) that is common today. AM and FM radio stations and also the TV stations use the links commonly.
What is the function of exciter in transmitter?
The exciter is really a very small transmitter. It produces the exact kind of signal that the transmitter makes, except that its power is too low to be of much use. In the transmitter there is an amplifier that boosts this low power to a high level so that it can reach farther. A classical design example is an FM transmitter. A small exciter cabinet contains an audio input section, and RF oscillator and modulator, and a small power amplifier of perhaps 10 watts, and a small power supply to run these things. This is the exciter. The audio feed is sent into the exciter and an FM signal comes out. If you were close to the exciter with your receiver, and the exciter were connected directly to the radio antenna, you could listen to the station just fine. But 10 watts will only go a few miles. To cover a small town, you might need 1000 to 10,000 watts, or for a large city, you could use 100,000 watts. The transmitter therefore includes, besides the exciter cabinet, a much larger cabinet, or set of cabinets, containing a substantial power supply and amplifier to boost the exciter's power output to the proper level. It is this high-power output that is fed to the antenna.
Can an FM transmitter be used in a car?
Yes. FM transmitters will work with a car stereo.
What is an FM transmitter for IPod and how does it work?
An FM transmitter is an accessory that connects to an iPod and converts its audio into FM airwaves, so that you can listen to it with an FM radio. Some are fixed to a single frequency while others can adjust their output to different frequencies.
Will a solar powered FM receiver transmitter work on the moon?
yes it could
What is FM transmitter and what are the different FM transmitters?
FM transmitter : In this case the frequency of a carrier signal is modulated/altered in accordance with that of frequency of modulating signal. TYPES OF FM TRANSMITTER: 1> directly modulated FM transmitter. 2>indirectly modulated FM transmitter. an FM transmitter is a portable device that plugs into the headphone jack or proprietary output port of a portable audio or video device, such as a portable media player, CD player, or satellite radio system. The sound is then broadcast through the transmitter, and plays through an FM broadcast band frequency. Purposes for an FM transmitter include playing music from a device through a car stereo, or any radio.
Where can I find the the best FM transmitter?
From the research I have done, the best FM transmitter will depend on what you are using it for. Two that I found come rated with 4 and 1/2 stars are the Belkin TuneCast F8Z498-P FM Transmitter and the Griffin itrip auto fm transmitter for ipod.
What is an auto fm transmitter?
This is a transmitter that works in conjunction with your car stereo to broadcast content from your mp3 player over your radio using FM radio waves. This can also work with some digital recorders.
What is a itrip transmitter?
an iTrip transmitter is an FM transmitter that is compatible with Apple iPods. You can plug in your iPod, and it will play your music through an intermittent FM station.
Does e72 has FM transmitter?
no
Where do I buy a cheap FM transmitter for my iPod?
The best place to find a FM transmitter for your iPod is at Best Buy. You can also go online and use their website to find out the price regarding the FM transmitter.
Why power amplifier used in FM transmitter?
Amplifier is used in an FM transmitter to increase the level of a signal suitable for transmission
What devices can be used with an FM mp3 transmitter?
There are several different devices that can be used with an FM mp3 transmitter. Devices such as a portable CD player, portable DVD player, and satellite radios can be used with an FM mp3 Transmitter.
How do you send an MP3 to FM without a transmitter and MP3 player?
i won't send an mp3 to fm without a transmitter and mp3 player.
