Prob. 2

(a) In an FM system it is required that all the modulated signal power be concentrated in the sidebands and no power be transmitted at the carrier frequency.

What is the smallest value that ß can take? What is the power in the first sideband for this value of the modulation index?

(b) A carrier is modulated by two sinusoidal modulating signals so that the FM signal is given by

Dem(t) = Acos(2nfct + Busin2nfit + B2 sin2nfzt)

Show that the modulated signal has sidebands separated from the carrier not only at multiples of fı and of f but also has sidebands as well as separations of multiples of f1 + f2 and fı - f2.

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answer:

just reverse the digits.

: )

One of the benefits of working with chlorinated polyvinyl chloride (CPVC) pipe is that it can be cut with a variety of different tools that don’t require any electricity or heat. However, different cutting methods are preferred over others, depending on the application.

When cutting CPVC pipe, it is important to make a square, flat cut. An uneven cut limits the bonding area and weakens the fitting.

To help you make the best possible cut, we’ve put together the following dos and don’ts when cutting CPVC pipe in different situations.