TYPICAL CONVERSION FORMULAS - A.H. Systems

嚜燜YPICAL CONVERSION FORMULAS

LOG -> LINEAR VOLTAGE

dB?V to Volts

V = 10

Volts to dB?V

dB?V = 20 log(V) + 120

((dB?V 每 120) / 20)

(dBV / 20)

FIELD STRENGTH & POWER DENSITY

dB?V/m to V/m

V/m = 10

V/m to dB?V/m

(((dB?V/m) -120) / 20)

dB?V/m = 20 log(V/m) + 120

dBV to Volts

V = 10

Volts to dBV

dBV = 20log(V)

dBmW/m2 to dB?V/m

dB?V/m = dBmW/m2 + 115.8

dBV to dB?V

dB?V = dBV +120

dB?V/m to dB?A/m

dB?A/m = dB?V/m 每 51.5

dB?V to dBV

dBV = dB?V - 120

dB?A/m to dB?V/m

dB?V/m = dB?A + 51.5

dB?A/m to dBpT

DBpT = dB?A/m + 2

dBpT to dB?A/m

dB?A/m = dBpT 每 2

LOG -> LINEAR CURRENT

?A = 10 (dB?A / 20)

dB?A to uA

2

dB?V/m to dBmW/m

dBmW/m2 = dB?V/m 每 115.8

?A to dB?A

dB?A = 20 log(?A)

W/m to V/m

V/m = SQRT(W/m2 * 377)

dBA to A

A = 10 (dBA / 20)

V/m to W/m2

W/m2 = (V/m)2 / 377

A to dBA

dBA = 20log(A)

?T to A/m

A/m = ?T / 1.25

dBA to dB?A

dB?A = dBA + 120

A/m to ?T

?T = 1.25 * A/m

dB?A to dBA

dBA = dB?A -120

LOG -> LINEAR POWER

((dBm 每 30)/10)

2

E-FIELD ANTENNAS

Correction Factor

dB?V/m = dB?V + AF

V/m =

dBm to Watts

W = 10

Field Strength

Watts to dBm

dBm = 10log(W) + 30

Required Power

dBW to Watts

W = 10(dBW / 10)

Watts to dBW

dBW = 10log(W)

dBW to dBm

dBm = dBW + 30

Correction Factors

dB?A/m = dB?V + AF

dBm to dBW

dBW = dBm - 30

Assumed E-field for

shielded loops

dB?V/m = dB?A/m + 51.5

dB?V = dBm + 107

(50?)

dB?V = dBm + 10log(Z) + 90

numeric

LOOP ANTENNAS

TERM CONVERSIONS

dBm to dB?V

30 * watts * Gain

meters

Watts = (V/m * meters)2

30 * Gain numeric

dBpT = dB?V + dBpT/?V

CURRENT PROBES

dB?V to dBm

dBm = dB?V 每 107

(50?)

dBm = dB?V 每 10log(Z) 每 90

Correction Factor

dBm to dB?A

dB?A = dBm + 73

(50?)

dB?A = dBm 每 10log(Z) + 90

Power needed for injection probe given voltage(V) into

50? load and Probe Insertion Loss (IL)

dB?A to dBm

dBm = dB?A 每 73

(50?)

dBm = dB?A + 10log(Z) 每 90

dB?A to dB?V

dB?V = dB?A + 34

(50?)

dB?V = dB?A + 20log(Z)

dB?V to dB?A

dB?A = dB?V 每 34

(50?)

dB?A = dB?V 每 20log(Z)

dB?A = dB?V 每 dB(ohm)

Watts = 10

((IL + 10log(V2/50))/10)

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