A.H. Systems SAS-550-1B Bedieningshandleiding - Pagina 8

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A.H. Systems SAS-550-1B Bedieningshandleiding

A.H. Systems AK-4G Antenna Kit

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 =

dBA = -30.14

REV B

-33.0

(-2.76)

- 0.1