Audio and Data module system

In MODCOM-6, the basic principles of the superheterodyne receiveras currently used in modern communications systems are studied.The radio frequency (RF) signal is convened to an intermediate frequency (IF) signal.MODCOM-6 is much more than a standard broadcast radio receiver.It provides many auxiliary functions such as a precision RF Signal generator, an RF attenuator and an RF distortion generator.The student can perform meaningful and interesting experiments to test receiver performance such as image frequency reflection,noise figure, selectivity, mixing principle and PLLfrequency synthesis that could not be achieved with a standard AM receiver.Module DescriptionThe Superheterodyne Receiver and Synthesizer module consistsof the following:PLL RF Synthesizer Variable RF attenuator RF distortion stage Tuned RF amplifier Local oscillator consisting of: a phase detector, loop filter,VCO, and programmable divider Mixer IF amplifier Envelope detector AGC control Adder LCD to show RF and local oscillator (LO) frequency, LO divider Recommended Experiments:1. Mixing principle 2. Image frequency 3. Noise figure & sensitivity 4. Selectivity 5. Automatic gain control 6. PLL-based frequency synthesizer used as a local oscillator