Typical Data
MODEL 3140 BICONILOG™ ANTENNA
14
© EMC TEST SYSTEMS, L.P. – MARCH 2002
REV C – PN 399258
TYPICAL DATA
Figure 10 shows the typical VSWR for the Model 3140 in
the frequency range from 26-2000 MHz. Figure 11 shows
the typical horizontal antenna factors for the 3140 in the
same range. The separation distance for the ANSI C63.5 3
and 10 meter calibrations is measured from the antenna
midpoint, while for SAE/ARP-958 1 meter calibrations the
distance is measured from the antenna tip. Midpoint is
defined as half the distance between the small elements and
the bow-ties, which is about 65 cm from the small end tip.
Figure 12 shows the typical forward power required for 1,
3, and 10 V/m (with and without 80% amplitude
modulation) at 1 meter from the tip of the antenna, while
Figure 13 is for 3 meters from the antenna tip. Figures 14
and 15 show power requirements for the lower frequencies
at 3 meters based on measurements using a field probe on
an OATS over both conducting ground and a (2.4m)
2
ferrite
absorber field over conducting ground. The power shown
was measured with 1.5 meter transmit antenna and probe
height and horizontal polarization. Horizontal polarization
represents the worst-case power requirement; typically less
power is required for vertical polarization. In practice,
many users place ferrite tiles on the ground between the
antenna and probe to reduce reflected-ray interference. For
any other field strength
E
, multiply the power in Watts for
1 V/m by
E
2
.
