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Foundations of Wireless and Electronics, 10th Edition
book

Foundations of Wireless and Electronics, 10th Edition

by M. G. Scroggie, S. W. Amos
October 2013
Intermediate to advanced content levelIntermediate to advanced
570 pages
27h 46m
English
Newnes
Content preview from Foundations of Wireless and Electronics, 10th Edition
127
The capacitance required to tune the coil to 300 kHz, or 0.3 MHz,
is (Sec. 8.7, footnote) C = 25
333//V
2
L = 25 333/(0.3
3
x
1
200) =
235 pF. This, of course, includes the tuning capacitor itself plus the
stray capacitance of the wiring and of the coil. The whole of this is
equivalent to a perfect 235 pF in parallel with a resistance of, shall
we say, 0.75 ΜΩ (Fig. 8.12c). The reactance, X
0
is bound to be
same as X
L
at resonance; but to check it we can work it out from
\/2nfC = 1/(2π x 0.3 χ 0.000235) = 10
6
/(2π χ 0.3 χ 235) =
2260 Ω. Qcis therefore
R
c
/X
c
= 750000/1260 = 332.
If the two components are united as a tuned circuit, the total
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Publisher Resources

ISBN: 9781483105574