TV and radio modulation theory

[walters]

How do TV modulation signals work?
What circuit or stages makes or does the modulation signals?

How do TV's have carrier signals how do they work?
what circuit or stages makes these carrier signals?

How do Radio modulation signals work?
What circuit or stages makes or does the modulation signals?

How do Radio have carrier signals how do they work?
what circuit or stages makes these carrier signals?

What are sidebands?

What is a carrier frequency?

What does the carrier frequency do?

Does the carrier frequency "mix" or superimposes or FM or AM modulates the other input waveform?
How does the carrier frequency do this?

Added after 10 minutes:

How does TV and Radio moduation signals differ? whats the different between TV VS radio moduation signals?


How does TV and Radio carrier signals differ? whats the different between TV VS radio carrier signals?

 

[rednewguy]

radio IF is 455khz
tv IF is 44mhz for ntsc

carrier signal is which undergoes changes in amplitude/ phase/ frequency according to the changes in the input modulating signal.
it is a high frequency signal which helps to shift the band so as to reduce the antenna size.

fundamentally tv signal has horizontal sync, vetical sync, blanking pulses, and the message(0-5mhz), audio . sync pulses are to make synchronization between the receiver and transmitter. the lines are scanned interlaced whose trace and retrace is controlled by the sync pulses.

radio modulation signal has only audio signal 20hz-20khz
simple balanced modulator does the radio modulation

the modulation signal mixes with the carrier. it is not separable by filters but only by demodulators.