Write shortly about the instrumentation of FT-IR?  Please shortly answer at your own words. Answer should be to the point.

q4-  In spread spectrum communications, a pseudo-noise (PN) sequence converts _______ signal to ______ signalSelect one option:   a. unmodulated, modulated b. narrowband, wideband c. none of other answers d. wideband, narrowband

Question 3 a) For a single-frequency sine wave modulating signal of 3 kHz with a carrier frequency of 36 MHz, what is the spacing between sidebands? b) A carrier of 49 MHz is frequency-modulated by a 1.5-kHz square wave. The modulation index is 0.25. Sketch the spectrum of the resulting signal. (Assume only harmonics less than the sixth are passed by the system.)

Describe the difficulties in listening to a receiver without AGC.