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A Level     Radio     Digital     Simple Receiver        Extras Non Exam     Radio     >Simple TRF<     Superhet    

Radio Simple TRF


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Simple Radio - System Diagram / Circuit Diagram

This topic is unlikely to be in an exam but it might be useful for project work.

Simple Radio Receiver

Terminology

Advantages

Disadvantages

Carrier Wave, Information Signal and Modulation

Amplitude Modulation

AM transmitters vary the amplitude of the carrier wave.

Modulation AM and FM

80% Amplitude Modulation

AM Demodulation or Detection

Demodulating AM

Frequency Modulation

FM transmitters vary the frequency of the carrier wave.

Modulation AM and FM

FM on a Picoscope

Frequency Modulation

Advantages of FM

The sound quality is better with a wider range of frequencies being faithfully reproduced.

FM is transmitted on the VHF band. There is less radio interference on this band so the signals are clearer.

FM is much less affected by amplitude noise from lightning strikes or industrial machinery so the sound is clearer.

At night AM radio signals from distant transmitters interfere with the local transmitters so AM radio is not so good.

FM Disadvantages

The transmitters have a range of only 20 to 50 miles depending on the terrain so more transmitters are needed to cover the country.

AM transmitters on the Medium Frequency or Medium Wave band have a range up to several hundred miles. Fewer transmitters are needed to cover the country.

FM radios cost more to build because they are more complex than AM.

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