TYPICAL CONVERSION FORMULAS - A.H. Systems …

1 TYPICAL CONVERSION FORMULASLOG -> LINEAR VOLTAGEFIELD STRENGTH & POWER DENSITYdB V to VoltsV = 10 ((dB V 120) / 20)dB V/m to V/mV/m = 10 (((dB V/m) -120) / 20)Volts to dB VdB V = 20 log(V) + 120V/m to dB V/mdB V/m = 20 log(V/m) + 120dBV to VoltsV = 10 (dBV / 20)dB V/m to dBmW/m2dBmW/m2 = dB V/m to dBVdBV = 20log(V)dBmW/m2 to dB V/mdB V/m = dBmW/m2 + to dB VdB V = dBV +120dB V/m to dB A/mdB A/m = dB V/m V to dBVdBV = dB V - 120dB A/m to dB V/mdB V/m = dB A + -> LINEAR CURRENTdB A/m to dBpTDBpT = dB A/m + 2dB A to uA A = 10 (dB A / 20)dBpT to dB A/mdB A/m = dBpT 2 A to dB AdB A = 20 log( A)W/m2 to V/mV/m = SQRT(W/m2 * 377)dBA to AA = 10 (dBA / 20)V/m to W/m2W/m2 = (V/m)2 / 377A to dBAdBA = 20log(A) T to A/mA/m = T / to dB AdB A = dBA + 120A/m to T T = * A/mdB A to dBAdBA = dB A -120E-FIELD ANTENNASLOG -> LINEAR POWER Correction FactordB V/m = dB V + AFdBm to WattsW = 10((dBm 30)/10)Field StrengthV/m = 30 * watts * Gain numeric metersWatts to dBmdBm = 10log(W) + 30 Required PowerWatts = (V/m * meters)2 30 * Gain numericdBW to WattsW = 10(dBW / 10)Watts to dBWdBW = 10log(W)LOOP ANTENNASdBW to dBmdBm = dBW + 30 Correction FactorsdB A/m = dB V + AFdBm to dBWdBW = dBm - 30 Assumed E-field for shielded loopsdB V/m = dB A/m + CONVERSIONSdBpT = dB V + dBpT/ VdBm to dB VdB V = dBm + 107 (50 )dB V = dBm + 10log(Z) + 90 CURRENT PROBESdB V to dBmdBm = dB V 107 (50 )dBm = dB V 10log(Z)

2 90 Correction FactordB A = dB V dB(ohm)dBm to dB AdB A = dBm + 73 (50 )dB A = dBm 10log(Z) + 90 Power needed for injection probe given voltage(V) into 50 load and Probe Insertion Loss (IL)dB A to dBmdBm = dB A 73 (50 )dBm = dB A + 10log(Z) 90 Watts = 10 ((IL + 10log(V2/50))/10)dB A to dB VdB V = dB A + 34 (50 )dB V = dB A + 20log(Z)dB V to dB AdB A = dB V 34 (50 )dB A = dB V 20log(Z)