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Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024
Webmaster:
    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Electrical Field Strength Conversion Table

In the far field, Zo = 120π (377Ω)

Field Strength Calculation:

The field strength is calculated by adding the Antenna Factor and Cable Factor, and subtracting the Amplifier Gain from the measured reading. The basic equation is as follows:

FS = RA + AF + CF - AG

Where:

FS = Field Strength
RA = Receiver Amplitude
AF = Antenna Factor
CF = Cable Attenuation Factor
AG = Amplifier Gain

1 Gauss = 100 microTesla = 80 Amps/meter

Electrical Field Strength Magnetic Field Strength
dBμV/m μV/m dBμA/m μA/m picogauss picoTesla
  0 1.0 -51.5   0.00265   33.1 0.0033
  5   1.78 -46.5 0.0047   58.8 0.0059
10    3.162   41.5 0.0084 105.0 0.0105
15    5.623   36.5 0.0149 186.2 0.0186
20  10.000   31.5 0.0265 331.5 0.0331
        nanogauss  
25 17.8 -26.5 0.0472 0.590 0.0590
30   31.62 -21.5 0.0839 1.048 0.1048
35   56.23 -16.5 0.1492 1.865 0.1865
37   70.79 -14.5 0.1878 2.347 0.2347
40 100.00 -11.5 0.2652 3.315 0.3315
  mV/m        
50   0.316 -1.5   0.839     10.48   1.048
60   1.000   8.5   2.652     33.15   3.315
70   3.162 18.5   8.388 104.8 10.485
80 10.000 28.5 26.525 331.5 33.156
      mA/m μgauss nanoTesla
  90     31.6 38.5   0.0839     1.048   0.1048
100   100.0 48.5   0.2652     3.315   0.3315
110   316.2 58.5   0.8388 10.48 1.048
120 1000.0 68.5 2.652 33.15 3.315
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