A.H. Systems AK-40G, Operation Manual

Page: 17 / 20

A.H. Systems AK-40G Antenna Kit
©
A.H. Systems inc.
– REV C
17
ANTENNA FORMULAS AND CALCULATIONS
E-FIELD ANTENNAS
Add antenna factor plus cable loss to receiver reading in dBuV to convert to field
strength in dBuV/meter.
Field Strength(dBuV/m) = SA(dBuV) + AF(dB/m) + cable loss (dB)
LOOP ANTENNA
dBpT = dBuV + dBpT/uV + Cable Loss
dBuV/m = dBpT + 49.5 dB
BROADBAND CURRENT PROBES
A specific Transfer Impedance Factor is associated with each frequency. This number is
to be subtracted from the receiver reading in order to convert to dBuA
dB

A = dB

V (from Receiver) - Transfer Impedance (dB

) - cable Loss (dB)
EXAMPLE:
Assume that the frequency of interest is 80 KHz and we need to find the current at this
frequency. Connect the probe per figure 1
Frequency: 80 KHz
Transfer Impedance: -2.76 dB ohms
Cable Loss: 0.1dB
Receiver Reading: -33.0dBuV
dB

A = dB

V (from Receiver) - Transfer Impedance (dB

) - cable Loss (dB)
dB

A = -33.0 - (-2.76) - - 0.1
dB

A = -30.14