ETS-Lindgren 3141 BiConiLog Log-Periodic/T Bow-Tie Antenna (Archived) - Manual (Page 5)

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