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24V input laptop adapter for airplanes and heavy equipment  PowerStream's Raptor Creative division awarded best of show at CES by HotHardware
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24V input laptop adapter for airplanes and heavy equipment PowerStream's Raptor Creative division awarded best of show at CES by HotHardware
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| May 24, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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dbm to watts conversion for radio, radar and microwaves |
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Decibels and dbmDecibels are used to represent the ratio of two quantities of power: db = 10 log P1/P0 . In the case of dbm the reference power P0 is 1 milliwatt : dbm = 10 log P1/1mw. Inverting this equation gives the power in terms of the reference power: P1= P010db/10. In the case of dbm the equation is P1= 1mw·10dbm/10.Why? It is not unusual in a radio, radar, or microwave system to have 100,000 watts of transmit power, 1 microwatt of receive power, and various gains and losses from antennas, distance, and absorbing media. Adding and subtracting db is more convenient than multiplying, particularly if you are using a slide rule and trying to keep track of the decimal point. For signals on a wire it is much easier to measure volts or amps with a voltmeter or current probe, but dbm can still be used. Since Watts are proportional to Amps squared or Volts squared, db (in power) = 20 log V1/V0 or db = 20 log I1/I0 . This is only useful in cases where the voltage or current is measured at the same impedance or resistance, which allows the ratio of two powers I2R or V2/R to cancel out the R.
We hope that this information is helpful. Now go out and design something that needs a charger, power supply, or battery pack! |
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