The amplifier feeds either an internal speaker or headphones. In a self-contained radio receiver for audio, the signal from the detector after the tuner is run through a volume control and to an amplifier stage. Still later, phase locked loop methods were used, with microprocessor control. This system shifts the radio frequency of interest to a fixed frequency so that it can be tuned with fixed-frequency band-pass filter. Modern radio tuners use a superheterodyne receiver with tuning selected by adjustment of the frequency of a local oscillator. A later method used a potentiometer supplying a variable voltage to varactor diodes in the local oscillator and tank circuits of front end tuner, for electronic tuning. Often several sections would be provided on a tuning capacitor, to tune several stages of the receiver in tandem, or to allow switching between different frequency bands. Older models would realize manual tuning by means of mechanically operated ganged variable capacitors. Combined with a detector, also known as a demodulator (diode D1 in the circuit), it becomes the simplest radio receiver, often called a crystal set. This creates a resonant circuit which responds to an alternating current at one frequency. The simplest tuner consists of an inductor and capacitor connected in parallel, where the capacitor or inductor is made to be variable. Inductively coupled crystal radio receiver The verb tuning in radio contexts means adjusting the receiver to detect the desired radio signal carrier frequency that a particular radio station uses. Subcarriers are then processed like real radio transmissions, but the whole bandwidth is sampled with an analog-to-digital converter (A/D) at a rate faster than the Nyquist rate (that is, at least twice the IF frequency).Ī tuner can also refer to a radio receiver or standalone audio component that is part of an audio system such as a hi-fi or stereo, to be connected to a separate amplifier. These are transmitted inside the receiver as an intermediate frequency (IF). use a wider frequency bandwidth, often with several subcarriers. More complex transmissions like PAL/ NTSC (TV), DAB (digital radio), DVB-T/ DVB-S/ DVB-C (digital TV) etc. Broadcast FM/ AM transmissions usually feed this intermediate frequency (IF) directly into a demodulator that converts the radio signal into audio-frequency signals that can be fed into an amplifier to drive a loudspeaker. Go to Product Repair.Luxman T-240L stereo FM tuner and L-235 amplifierĪ tuner is a subsystem that receives radio frequency (RF) transmissions, such as FM broadcasting, and converts the selected carrier frequency and its associated bandwidth into a fixed frequency that is suitable for further processing, usually because a lower frequency is used on the output. If the issue is still unresolved, service may be required. Try replacing the cable with a new one, making sure to reset the car stereo again after the cable has been replaced. If the satellite radio tuner is still not recognized, there may be a problem with the cable between the satellite radio tuner and the car stereo.Reset the car stereo by pressing the RESET button.Make sure that the SOURCE selector is set to the correct setting for the satellite radio service.Check to make sure that the car stereo is compatible with your satellite radio tuner:.If your hookup contains a separate satellite radio tuner, check to make sure that all of your connections are accurate and secure between the satellite radio tuner and the car stereo.NOTE: Because each of these steps represents a possible solution to this issue, check the tuner status after completing each step. Manuals are posted on your model support page. IMPORTANT: If model-specific information is needed to complete any of these steps, refer to the instructions supplied with the product. When the car stereo receiver is not recognizing the SIRIUS Satellite Radio® service or the XM Satellite Radio® service even though the satellite radio tuner is connected to it, follow these steps to try to resolve this issue:
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