2. MEL’S
DOG & PONY SHOW

3. RADIO FREQUENCY FILTERS

4. RADIO FREQUENCY FILTERS
A radio frequency filter
is an electronic circuit that
will allow or not allow a
band of frequencies to
pass thru it

5. RADIO FREQUENCY FILTERS
There are 2 basic
types of filters
SERIES OR
PARALLEL

6. RADIO FREQUENCY FILTERS
Today we will be discussing
SERIES FILTERS
More commonly called
The Series Resonant Circuit

7. RADIO FREQUENCY FILTERS
The purpose of a
SERIES RESONANT CIRCUIT
is to allow a specific band of
frequencies to pass thru it

8. RADIO FREQUENCY FILTERS
The simplest
SERIES RESONANT CIRCUIT
looks like this

9. RADIO FREQUENCY FILTERS

10. RADIO FREQUENCY FILTERS
PRIMARY ASSUMPTION
The antenna is a standard Half-Wave Dipole
The antenna is tuned to the center of a band
Now, to design our Series Resonant
Circuit we will need to do some math
These are the formulas we will need

11. RADIO FREQUENCY FILTERS
Inductance
in Henries
Capacitance
in Farads

12. RADIO FREQUENCY FILTERS
VSWR EQUATIONS

13. RADIO FREQUENCY FILTERS

14. RADIO FREQUENCY FILTERS
TIME FOR THE
SPREAD SHEET