mel’s dog & pony show radio frequency filters a radio frequency filter is an electronic...
TRANSCRIPT
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MEL’S
DOG & PONY SHOW
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RADIO FREQUENCY FILTERS
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A radio frequency filter
is an electronic circuit that
will allow or not allow a
band of frequencies to
pass thru it
RADIO FREQUENCY FILTERS
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There are 2 basic
types of filters
SERIESOR
PARALLEL
RADIO FREQUENCY FILTERS
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Today we will be discussing
SERIES FILTERS
More commonly called
The Series Resonant Circuit
RADIO FREQUENCY FILTERS
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The purpose of a
SERIES RESONANT CIRCUIT
is to allow a specific band of
frequencies to pass thru it
RADIO FREQUENCY FILTERS
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The simplest
SERIES RESONANT CIRCUIT
looks like this
RADIO FREQUENCY FILTERS
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RADIO FREQUENCY FILTERS
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Now, to design our Series Resonant Circuit we will need to do some math
These are the formulas we will need
RADIO FREQUENCY FILTERS
PRIMARY ASSUMPTION
The antenna is a standard Half-Wave Dipole
The antenna is tuned to the center of a band
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RADIO FREQUENCY FILTERS
RESONANCE AND REACTANCE FORMULAS
2 * pi * L Cf =
1
4 * pi * f2 2LC =1
4 * pi * f * L22C =1
XL = 2 * pi * f * L2 * pi * f * C
1XC =
F
BWQ =
4 * pi * f * CL =
12 2
Inductance
in Henries
Capacitance
in Farads
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RADIO FREQUENCY FILTERS
VSWR EQUATIONS
P = 1 2Z Z
Z1 Z2
VSWR = 1 P
1 P
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RADIO FREQUENCY FILTERS
COIL WINDING FORMULASL = self inductance in microhenrys
N = total number of turns
r = mean radius of the coil in inches
l = length of coil in inches
9r + 10lL =
(r N) 2
L(9r +100l)
rN =
l
r
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TIME FOR THE
SPREAD SHEET
RADIO FREQUENCY FILTERS
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