A.H. Systems SAS-517 Log Periodic Antenna
CALCULATIONS
EMISSIONS TESTING
Individual calibration data for the log periodic antenna is supplied at
appropriate distances (3, and 10 meter) to comply with various emissions test
requirements. For emissions measurements, add antenna factor plus cable
loss to receiver reading in dB
V to convert to field strength in dB
V/meter.
Field Strength(dBuV/m) = SA(dBuV) + AF(dB/m) + cable loss (dB)
SA = Spectrum Analyzer or Receiver voltage reading
AF = Antenna Correction Factor
CL = Cable Loss in dB
IMMUNITY TESTING
For Immunity measurements, the generated electric field strength can be
calculated by:
FS = Approximate Field Strength in (V/m)
P = Power in watts
g = Numeric Gain
d = Distance in meters
A.H. Systems inc. – May 2014
REV C
12
