# Calculus

February 17th Fact-of-the-DayCalculus is fundamentally
a study of rates of change, but extends to much more. Rate of change
information makes it possible to answer questions like these: How much
does VSWR change when antenna height is changed? How much does VSWR change
when antenna length is changed? How much does VSWR change when antenna
element spacing is changed? How much does amplifier plate current change
when amplifier load-impedance changes. How much does amplifier output
change when amplifier input changes? Problems like those can be solved
by calculating the derivative, which also makes it possible to answer
the often-important question, what is the lowest or highest value? The
process can be reversed to calculate an integral. Integrals can be used
to calculate areas, volumes, arc lengths, and other quantities. *©2005
Martek International All rights reserved.*

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