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Newnes Circuit Calculations Pocket Book
book

Newnes Circuit Calculations Pocket Book

by Thomas J. Davies
April 2016
Intermediate to advanced content levelIntermediate to advanced
384 pages
12h 56m
English
Newnes
Content preview from Newnes Circuit Calculations Pocket Book
326 Circuit calculations pocket book
Example 18 If the resistances R
x
and R
2
in Figure 18.17 are 20 and
30 ft respectively, calculate the characteristic impedance.
Ro =
20 x 30
2
20 + (2 x 30)
15 ft
10
PRINT "PROG 2 8 3"
20
PRINT "SYMMETRICAL PI ATTENUATOR"
30
INPUT "ENTER Rl" : Rl
4
0 INPUT "ENTER R2" ; R2
50
LET R0=SQR((R1*(R2
A
2))/(R1+(2*R2)))
60
LET N=(RO+R2)/(R2-RO)
70
PRINT "CHARACTERISTIC IMPEDANCE = " RO
80
PRINT "ATTENUATION = " N
Example 19 Find the attenuation in the network in Example 18.
(N + 1\
(N + 1)
30 = 15 -
(N-\)
30(N - 1) = \5(N + 1)
30/V - 30 =
157V
+ 15
30N - 15N =15 + 30
15N = 45
N = 3 (9.5 dB)
(See program 283, above.) ...
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Publisher Resources

ISBN: 9781483101132