How do I change the frequency on my FM transmitter?

How do I change the frequency on my FM transmitter?

Thanks for your question:

1. Long press the multifunction key until the LED display flashing.
2. Choose channel in the car audio.
3. Adjust the FM transmitter frequency to match the car radio FM channel.
4. Connect phone bluetooth or insert the USB/TF card, FM Transmitter will start to play automatically.

What is the best frequency for FM transmitter UK?

The best frequency for an FM transmitter in the UK is usually 87.5. This is because frequencies from 87.5-88 are reserved for short-term services using a Restricted Service Licence, so regular stations don’t use them.

How do you calculate RF output power?

Power gain in decibels, GdB=10log1200=30.79 dB. The output power is Pout|dBm=PdB+Pin|dBm=30.79+5=35.79 dBm.

How do I tune my radio to unused FM frequency?

Using a Bluetooth FM transmitter typically involves four steps:

1. Plug the transmitter into a power source (usually the cigarette lighter socket)
2. Tune your car radio to an unused frequency.
3. Tune the FM transmitter to the same frequency.
4. Pair your phone or another device with the FM transmitter using Bluetooth.

What kind of circuit does a FM transmitter use?

The FM transmitter is a single transistor circuit. In the telecommunication, the frequency modulation (FM) transfers the information by varying the frequency of carrier wave according to the message signal. Generally, the FM transmitter uses VHF radio frequencies of 87.5 to 108.0 MHz to transmit & receive the FM signal.

How does an oscillator in a FM transmitter work?

When this oscillator is given a voltage input, the output signal is a mixture of the input signal and the oscillating output signal, producing a modulated signal. In other words, the frequency of the oscillator generated circuit varies with the application of an input signal, producing a frequency modulated signal.

How to calculate the VB of a FM transmitter?

The voltage across the base, Vb is assumed to be 0.7V more than the emitter voltage Ve. Now assume the emitter voltage to be 12% of Vcc, i.e. 1.08V. This gives Vb to be 1.78V. Thus, R2 = Vb/Ibias = 22.25K.

How is a variable capacitor used in a FM transmitter?

The variable capacitor is used to change the resonant frequency for fine modification to the FM frequency band. The modulated signal from the antenna is radiated as radio waves at the FM frequency band and the antenna is nothing but copper wire of 20cm long and 24 gauge.