
36-6 Electromagnetic Variables
and at various angles of inclination. is is most easily achieved by placing the EUT on a turntable,
wh
ich
is th
en
ro
tated
du
ring
th
e
te
st
. To al
low
me
asurement
at va
rious
in
clination
an
gles,
th
e
re
ceiv-
ing
an
tenna
he
ight
mu
st
be va
ried,
an
d
th
is
is ac
complished
by mo
unting
it on a ha
lyard
. A ty
pical
op
en-eld
si
te
ap
pears
in Fi
gure
36.1.
An op
en-eld
si
te
pr
ovides
re
peatable
da
ta
on
ly
if th
ere
ar
e
no ne
arby
tr
ees
or st
ructures
th
at
co
uld
ca
use
un
desirable
re
ections
. Be
fore
it ca
n
be re
liably
us
ed,
it mu
st
be te
sted
. i
s
is do
ne
by gen
erating
a known electromagnetic eld and measuring it. e eld is normally generat ...