ETS-Lindgren 3142D BiConiLog Antenna (Archived) - Manual (Page 35)

Application | 35
6.0 Application
Without Optional End Plates
For emissions measurements, electric field strength in db[V/m] is obtained from:
E(dBV/m)=V(dBV)+AF(dB1/m)+

(dB)
V = the receiver or spectrum analyzer voltage reading
AF = antenna factor

= cable loss in dB, if cable losses are non-negligible
For immunity testing, the electric field strength generated at a distance d can be
approximated by:
 
E
Pg
d
V / m

30
d = distance, in meters
g = numeric gain (10
G[dB]/10
)
P = antenna net input power, in watts
An estimate of the power required for any field strength E can be obtained from
the forward power graphs in Typical Data beginning on page 39, 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 V/m) = E 2 P(1 V/m)
Actual transmitted field strength should be verified using an ETS-Lindgren
electric field probe, or equivalent.
Archived 6/19/13