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Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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Electric Field Conversions

The space surrounding an electric charge or in the presence of a time-varying magnetic field has a property called an electric field. This electric field exerts a force on other electrically charged objects. The concept of an electric field was introduced by Michael Faraday.

The electric field is a vector field with SI units of Newtons per coulomb (N C−1) or, equivalently, volts per meter (V m−1). The SI base units of the electric field are kg·m·s−3·A−1. The strength of the field at a given point is defined as the force that would be exerted on a positive test charge of +1 coulomb placed at that point; the direction of the field is given by the direction of that force. Electric fields contain electrical energy with energy density proportional to the square of the field intensity. The electric field is to charge as gravitational acceleration is to mass and force density is to volume. - Wikipedia

These formulas are valid for a 50 Ω system
dBV log conversion equation Watts from voltage & resistance equation
dBuV log conversion equation dBuA log conversion equation
dBW log conversion equation dBm log conversion equation

 

Volts dBV dBμV Watts dBW dBm dBμA
1 000 60.0 180.0 20 000 43.0 73.0 146.0
750 57.5 177.5 11 250 40.5 70.5 143.5
500 54.0 174.0 5 000 37.0 67.0 140.0
250 48.0 168.0 1 250 31.0 61.0 134.0
200 46.0 166.0 800 29.0 59.0 132.0
100 40.0 160.0 200 23.0 53.0 126.0
75 37.5 157.5 113 20.5 50.5 123.5
50 34.0 154.0 50 17.0 47.0 120.0
25 28.0 148.0 12.5 11.0 41.0 114.0
20 26.0 146.0 8.00 9.03 39.0 112.0
10 20.0 140.0 2.00 3.01 33.0 106.0
7.5 17.5 137.5 1.13 0.51 30.5 103.5
5.0 14.0 134.0 0.50 -3.01 27.0 100.0
2.5 7.96 128.0 0.125 -9.03 21.0 94.0
2.0 6.02 126.0 0.080 -11.0 19.0 92.0
1.0 0.00 120.0 0.020 -17.0 13.0 86.0
0.75 -2.50 117.5 1.1x10-2 -19.5 10.5 83.5
0.50 -6.02 114.0 5.0x10-3 -23.0 6.99 80.0
0.25 -12.0 108.0 1.3x10-3 -29.0 0.97 74.0
0.20 -14.0 106.0 8.0x10-4 -31.0 -0.97 72.0
0.10 -20.0 100.0 2.0x10-4 -37.0 -6.99 66.0
7.5x10-2 -22.5 97.5 1.1x10-4 -39.5 -9.49 63.5
5.0x10-2 -26.0 94.0 5.0x10-5 -43.0 -13.0 60.0
2.5x10-2 -32.0 88.0 1.3x10-5 -49.0 -19.0 54.0
2.0x10-2 -34.0 86.0 8.0x10-6 -51.0 -21.0 52.0
1.0x10-2 -40.0 80.0 2.0x10-6 -57.0 -27.0 46.0
7.5x10-3 -42.5 77.5 1.1x10-6 -59.5 -29.5 43.5
5.0x10-3 -46.0 74.0 5.0x10-7 -63.0 -33.0 40.0
2.5x10-3 -52.0 68.0 1.3x10-7 -69.0 -39.0 34.0
2.0x10-3 -54.0 66.0 8.0x10-8 -71.0 -41.0 32.0
1.0x10-3 -60.0 60.0 2.0x10-8 -77.0 -47.0 26.0
7.5x10-4 -62.5 57.5 1.1x10-8 -79.5 -49.5 23.5
5.0x10-4 -66.0 54.0 5.0x10-9 -83.0 -53.0 20.0
2.5x10-4 -72.0 48.0 1.3x10-9 -89.0 -59.0 14.0
2.0x10-4 -74.0 46.0 8.0x10-10 -91.0 -61.0 12.0
1.0x10-4 -80.0 40.0 2.0x10-10 -97.0 -67.0 6.0
7.5x10-5 -82.5 37.5 1.1x10-10 -99.5 -69.5 3.5
5.0x10-5 -86.0 34.0 5.0x10-11 -103.0 -73.0 0.0
2.5x10-5 -92.0 28.0 1.3x10-11 -109.0 -79.0 -6.0
2.0x10-5 -94.0 26.0 8.0x10-12 -111.0 -81.0 -8.0
1.0x10-5 -100.0 20.0 2.0x10-12 -117.0 -87.0 -14.0
7.5x10-6 -102.5 17.5 1.1x10-12 -119.5 -89.5 -16.5
5.0x10-6 -106.0 14.0 5.0x10-13 -123.0 -93.0 -20.0
2.5x10-6 -112.0 7.96 1.3x10-13 -129.0 -99.0 -26.0
2.0x10-6 -114.0 6.02 8.0x10-14 -131.0 -101.0 -28.0
1.0x10-6 -120.0 0.00 2.0x10-14 -137.0 -107.0 -34.0

 

Power V@ 1 m V@ 10 m V@ 100 m V@ 1 km V@ 10 km
1 W 5.5 V/m 0.55 V/m 0.05 V/m 5.5 mV/m 0.55 mV/m
10 W 17.4 V/m 1.7 V/m 0.17 V/m 17 mV/m 1.7 mV/m
100 W 55 V/m 5.5 V/m 0.55 V/m 55 mV/m 5.5 mV/m
1 kW 174 V/m 17.4 V/m 1.74 V/m 170 mV/m 17 mV/m
10 kW 550 V/m 55 V/m 5.5 V/m 550 mV/m 55 mV/m
100 kW 1740 V/m 174 V/m 17.4 V/m 1.74 mV/m 174 mV/m