ETS-Lindgren 3140B Hybrid Log Periodic and Bowtie (BiConiLog) - Manual (Page 36)

Model 3140B Typical Forward Power (FP)
The forward power graphs illustrate the typical forward power required for one,
three, and 10 V/m (with and without 80% amplitude modulation).
• The graph on page 37 illustrates one meter from the tip of the antenna,
and the graph on page 38 illustrates three meters from the tip of the
antenna.
• The graphs on page 39 and page 40 illustrate power requirements for
the lower frequencies at three meters based on measurements using a
field probe on an Open Area Test Site (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 .
36 | Typical Data