April 2016
Intermediate to advanced
384 pages
12h 56m
English
Content preview from Newnes Circuit Calculations Pocket Book
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324 Circuit calculations pocket book
Example 16 Design a T-type attenuator to give 25 dB attenuation
and have a characteristic impedance of 600 ft.
20 log N - 25
25
log N = — = 1.25
5
20
N
= antilog 1.25 = 17.8
(N - 1) 600 x 16.8
' (N + 1)
(2A0
18.8
600 x 35.6
= 536 ft
(N
2
- 1) (17.8)
2
- 1
= 67.6 ft
10 PRINT "PROG 281"
20 PRINT "SYMMETRICAL T ATTENUATOR"
30 INPUT "ENTER ATTENUATION IN DECIBELS"
40 INPUT "CHARACTERISTIC IMPEDANCE" ; RO
50 LET X=NDB/20
60 LET N=10*X
70 LET Rl=RO*(N-l)/(N+l)
80 LET R2=R0*2*N/((N*2)-l)
90 PRINT "Rl = " Rl "OHMS"
100 PRINT "R2 = " R2 "OHMS"
18.7 Asymmetrical T attenuator
This type of attenuator is designed to matc ...
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