ETS-Lindgren 3141 BiConiLog Log-Periodic/T Bow-Tie Antenna (Archived) - Manual (Page 6)

6
TYPICAL DATA
Figure 1 shows typical 26-2000 MHz VSWR for the EMCO Model 3141. Figure 2
shows typical 3141 26-2000 MHz antenna factors. Distance for the ANSI 3 and 10 meter
calibrations is measured from the antenna midpoint, while for SAE 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 45 cm from the small end
tip. Figure 3 shows typical Model 3141 26-2000 MHz forward power required for 1, 3,
and 10 V/m at 1 m from the tip of the antenna, while Figure 4 is for 3 m from the antenna
tip. The power shown was measured over a ground plane with 1.5 m transmit antenna
and probe height, horizontal polarization. Horizontal polarization is the worst-case
power required; 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 .
Archived 3/18/10