AN236 Summary AN236(SerialComm) Application Note PDF Electronic communications is all about interlinking circuits (processors or other integrated circuits) to create a symbiotic system. For those individual circuits to swap information, they must share a common standard communication protocol. Many communication protocols have been designed to achieve data exchange. The most common serial communication protocols are […]

Table of effective power in dBm and watts given RMS voltage or peak-to-peak voltage.   Volts (RMS)   Volts (PEP) dBm (50ohm) Watts (50ohms) 1.000 2.83 -16.990 0.020 1.200 3.39 -15.406 0.029 1.440 4.07 -13.822 0.041 1.728 4.89 -12.239 0.060 2.074 5.87 -10.655 0.086 2.488 7.04 -9.072 0.124 2.986 8.45 -7.488 0.178 3.583 10.1 -5.904 […]

RF Power Density vs Distance The RF power density at any distance from a transmitter that is radiating RF power will depend upon the antenna gain, power into the antenna, and the distance from the antenna.  The table below illustrates haw fast the RF power power density drops off given certain distances from the radiating […]

Miles to Kilometers Conversion Table   Miles km Miles km Miles km Miles km Miles km Miles km Miles km 0.1 0.16 3.1 4.99 6.1 9.82 9.1 14.65 12.1 19.47 15.1 24.30 18.1 29.13 0.2 0.32 3.2 5.15 6.2 9.98 9.2 14.81 12.2 19.63 15.2 24.46 18.2 29.29 0.3 0.48 3.3 5.31 6.3 10.14 9.3 […]

Coax cable attenuation. All coax cable looses power.  The amount of power loss in a coax cable depends upon the length of the cable, the type of cable, and the frequency it is being used at. The following tables are helpful for predicting the amount of signal loss through a coax cable.  For example, if […]

The following table lists RF power levels given various RMS voltages. It converts uV to dBm with either a 50 ohm load or 75 ohm load.   uV dBm (50ohm) dBm (75ohm) fW (50ohm) fW (75ohm) 0.050 -133.010 -134.771 0.050 0.033 0.055 -132.182 -133.943 0.061 0.040 0.061 -131.355 -133.116 0.073 0.049 0.067 -130.527 -132.288 0.089 0.059 0.073 […]