Application - ETS-Lindgren BiConiLog 3140 Manual

Application

APPLICATION
12
Assemble and mount the Model 3140 per the instructions in
the previous sections. Connect an N-type coaxial cable
from the antenna connector to a signal generator or
amplifier. Contact with any metal or non-metallic structure
can capacitively load the antenna, which may cause
unrepeatable results.
ensure that no part of the dipole elements or bow-ties are in
contact with the tripod or tower, particularly in vertically-
polarized tests. Where possible, run the feed cable straight
back at least 1 meter or more from the Model 3140 before
dropping vertically.
Both horizontal and vertical polarization is easily
accomplished when the Model 3140 is mounted on an
ETS-Lindgren tower. The Model 7-TR tripod is designed
specifically for the T bow-tie BiConiLog™ antennas to
allow easy polarization changes, and with the air
polarization option can provide automated polarization
using a Model 2090 controller.
"Mounting Instructions" shows the mounting scheme for
both ETS-Lindgren towers and the 7-TR tripod.
For immunity testing, the electric field strength generated
at a distance d can be approximated by the formula
30 Pg
( )
V / m =
E
d
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
MODEL 3140 BICONILOG™ ANTENNA
Therefore, care must be taken to
The previous section
© EMC TEST SYSTEMS, L.P. – MARCH 2002
REV C – PN 399258