A.H. Systems Model Active Monopole Antennas
©
A.H. Systems inc
REV E
7
GENERAL USE INSTRUCTIONS
The calibration tables shown provide a listing of the frequency of operation and
its antenna factor in dB/m. The field strength is the receiver voltage in dB
V
plus the antenna factor (refer to the antenna factor calibration) plus any cable
loss. When making a measurement, mount the antenna on an appropriate mast
or tripod. Ensure that the active monopole antenna is turned on and use the
appropriate correction factors. The active monopole antenna is easy to set up
and provides good reception with a minimal need for space. Its flat 0 dB
antenna factor makes it a convenient choice when calculating the field intensity.
The signal field strength is the receiver voltage in dB
V plus the antenna factor
(refer to the antenna factor calibration tables) plus any cable loss.
ANTENNA FORMULAS AND CALCULATIONS
A specific antenna factor is associated with each frequency. This number is to be added
to the receiver reading (in dB
V) to convert to field intensity in dB
V/m.
EXAMPLE:
Assume the transmitter to be measured is operating at 1 MHz and the receiver reading
indicates 44.0 dB
V
AF (dB/m) = 0.1
Receiver reading (dB
V) = 44 dB
V
Cable loss (dB) = 0.7
Field Intensity = AF + receiver r cable loss
Field Intensity = 0.1 + 44.0 + 0.7
Field Intensity = 44.8 dB
V/m
