This tool helps convert from μV (microvolt) to dBµV (deciBel microvolt).
Note that μV is a positive number that represents the root-mean-square (RMS) voltage and it cannot be less than zero.
dBµV = 20*Log10(µV)
The same formula applies when converting either quantity scaled by distance (e.g. per-meter)
dBµV/m = 20*Log10(µV/m)
The dB scale is a very convenient representation for large numbers and allows for easy multiplication of two linear quantities.
uV/m or microvolt-per-meter is used by the FCC to specify radiated limits for RF equipment at a 3-meter distance from the source.
The first three columns of the following table of Radiated Emissions Limit is from . The calculator is used to find the dBuV/m equivalent value
|Freq. (MHz)||uV/m||dBuV/m||Distance (m)|
Use this calculator to find the max transmit power (in dBm) for an equivalent dBuV/m power. This is a way to quickly calculate whether your transmitter is within the FCC specified emissions limit.