--%>
Assignment Help - homework help

  Discriminator

Introduction to Discriminator

Discriminator is a demodulator. It divide audio signal from frequency modulated IF signal. Crystal diodes are employed like detector diodes. Usually, three types of detector circuits are employed as provided below.

1. Travis discriminator

2. Foster- Seeley discriminator

3. Ratio detector

LIMITER

It manages the noise pulses that are mixed with signals. It is a last IF amplifier. It acts like a clipper.

AUDIO AMPLIFIER

Very first AF signals are de-emphasised. After that, it amplifies the audio frequency signal. It is spit into driver, pre amplifier, and output amplifier. Driver and Pre and amplifiers are voltage amplifiers. A power amplifier is an output amplifier. It enhances the fidelity.

COMPARISON BETWEEN AM AND FM RECEIVERS

AM RECEIVER

FM RECEIVER

1. It operates along with AM Signals

2. IF signal frequency is 455 KHz

3. Bandwidth in 10 KHz

4. It uses detector

5. It don't use limiter

6. distortion and  Interference are more

1. It operates along with FM Signals

2. IF signal frequency is 10.7 MHz

3. Bandwidth is 200 KHz

4. It uses discriminator

5. It uses limiter

6. Interference and distortion are less.

DE-EMPHASIS

At the FM receiver, an operation reverse to pre-emphasis employed that is termed as De-emphasis. The amplitude of high frequency signal is reduced comparatively. R.C low pass filter network is employed. This network is containing a time stable of 75 micro seconds. It as well assists to decrease the noise frequency of the signal.

LIMITER

The amplitude of FM signal has to be constant. But when travelling to receiver form transmitter, fading, reflection and absorption of radio waves generate not wanted variation in the amplitude of signals. Therefore the variations should be eliminated for clear reception. Thus limiter is employed for this aim. It is employed previous to discriminator. Is in also termed as 'clipper' It is identical to IF amplifier that acts as a saturated amplifier. The input FM Signal is operated among the cut off point and saturation point of amplifier in this stage. Any amplitude across these points does not arrive at the output.

Latest technology based Electrical Engineering Online Tutoring Assistance

Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Discriminator homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Discriminator, project ideas and tutorials. We provide email based Discriminator homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Discriminator. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Electrical Engineering homework help and assignment help services. They use their experience, as they have solved thousands of the Electrical Engineering assignments, which may help you to solve your complex issues of Discriminator. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.