
36-1
36.1 Introduction
Electric and magnetic elds must be measured for a variety of reasons. A radio or TV broadcast station
is li
censed
to pr
ovide
re
liable
co
verage
ov
er
a sp
ecied
ge
ographic
ar
ea,
an
d
an
y
pr
operly
op
erating
re
ceiver
mu
st
pi
ck
up th
e
sig
nal
an
d
pr
operly
re
spond
to it. i
s
ca
n
be as
sured
on
ly
if th
e
br
oadcast
sig
nal
is of a gu
aranteed
mi
nimum
st
rength
. Al
so,
th
e
sig
nal
mu
st
no
t
be so st
rong
th
at
it in
terferes
wi
th
a di
stant
st
ation
sh
aring
th
e
sa
me
fr
equency
. e br
oadcast
e
ld
mu
st
be me
asured
ov
er
it
s
ge
ographic
ar
ea
o
f
c
overage
to b
e
s
ure
t
hat
i
t
s
atises
b
oth
c
riteria
.
Many electric devices unintentionally radiate electroma ...