April 2016
Intermediate to advanced
384 pages
12h 56m
English
Content preview from Newnes Circuit Calculations Pocket Book
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The a.c. voltage 97
= 1200 MHz
= 1.2 GHz
(See program 62, page 96.)
Example 20 A sine wave has a wavelength of 1 km. Calculate the
frequency.
1 km = 10
3
m
3 x 10
8
/ = r— = 3 x 10
5
Hz
10
3
(See program 62, page 96.)
Example 21 What wavelength does a frequency of 15 MHz corre-
spond to?
3 x 10
8
10
2
/ = = — = 20 m
15 x 10
6
5
(See program 63, page 96.)
6.7
Average value for a sine wave
The average value over a complete cycle is zero. The average value
over half a cycle is 0.637 V
p
. This result is important in some
applications, e.g. power supply rectifying circuits. The average
value can be found graphically, by finding the average of a number,
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