21. The modulated signal is shown below for a short segment of a random binary data-stream. 22. The information from the modulated signal is carried in sidebands on each side of the carrier frequency. 23. Multiplicative mixers are often used in conjunction with an oscillator in the communications field to modulate signal frequencies. 24. If the demodulating phase is even a little off, it results in crosstalk between the modulated signals . 25. If the circuit were not fairly linear, the modulated signal could not be recovered with reasonable fidelity. 26. The output signal can be viewed as a product of the input RF signal and the modulating signal . 27. Because of the orthogonality property of the carrier signals, it is possible to detect the modulating signals independently. 28. This optical transmitter converts the electrical signal to a downstream optically modulated signal that is sent to the nodes. 29. When hierarchical-modulated signals are transmitted, users with good reception and advanced receivers can demodulate multiple layers. 30. It also has a primitive spectrum analyzer with ?0 channels indication with wave monitoring of received / modulated signal .
