5
by the formula
(
)
E
Pg
d
V / m
=
30
,
where
d
is in meters,
g
is the numeric gain (10
G
[dB]/10
, see attached calibration data), and
P
is antenna net input power in watts. An estimate of the power required for any field
strength
E
can be obtained from Figure 3 or 4 in the Typical Data section below, which
shows power required in watts to generate 1 V/m. For any other field strength not
shown, multiply the power in watts by the desired
E
-field squared, or
(
)
(
)
P E
E P
V / m
V / m
=
2
1
.
Actual transmitted field strength should be verified using an EMCO Model 7100 series
electric field probe or equivalent. For IEC 1000-4-3 type testing, the antenna tip can be
placed at any distance between 1 and 3 m from the EUT as long as the front face plane is
illuminated according to the -0, +6 dB uniform field specification. In general, closer
distances require less power to create a given field strength.
Archived 3/18/10
