A.H. Systems 2381 Посібник користувача - Сторінка 7

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A.H. Systems Model Active Monopole Antennas

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 reading + cable loss

Field Intensity = 0.1 + 44.0 + 0.7

Field Intensity = 44.8 dBV/m

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