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What is 10log10 and how does it work in terms of calculating dBm?
Wiki User
∙ 15y ago
dBm is power with reference to 1 milliwatt, expressed on the logarithmic scale (decimals). To compute dBm x, from power P, the following formula is used:
x = 10log10(P)
This is ten times the logarithm to the base 10 of P.
Wiki User
∙ 15y ago
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What is mic and line level audio?
Mic level is -56 to -40 dbm. Line level is either -10 dbm or 4 dbm. You need a preamp to amplify a microphone to line level.
How do you convert 10W to dBm?
dBm us almost exactly the same as dB. The only difference is that there is a reference of 1 Watt = 0 dB, and 1 mW = 0 dBm. dBm is defined as power ratio in decibel (dB) referenced to one milliwatt (mW). It is an abbreviation for dB with respect to 1 mW and the "m" in dBm stands for milliwatt. dBm is different from dB. dBm represents absolute power, whereas in audio engineering the decibel is usually a voltage ratio of two values and is used then to represent gain or attenuation of an audio amplifier, or an audio damping pad. PdBm = 10*log10(1000*10W) = 40dBm
Where is the maximum magnetic force concentrated in a horse shoe magnet?
The correct answer depends upon the quality of the magnet and the quality of the iron that it is attracted to. In general terms, the holding force will be approximately 280 lbs. of force for each square inch of surface area that is between the magnet and the iron. The force is calculated as follows. The mks formula for force is F=B²A/2µ where F is in newtons, B in Tesla, A in sq. meters, and µ is the permeability of air which is 4·pi·1E-7. Then, considering the fact that good quality iron saturates at about B=2.2 Tesla, and 1 sq.in. is = 6.45E-4 sq.meters and plugging this into the eqution gives a force of about 1242 newtons or 279 lbs. If the horse shoe magnet is holding the iron at each end of the magnet then the force will double if lifting is exactly balanced at each end. The above assumes very good surface contact between magnet and iron. Practical holding forces may be lower which can be approximated by lowering the value of B to something like 1.7 or so. dbm 7/16/09
Units to measure power?
In the SI system the units of energy are Joules, and power is the rate of use or production of energy, so this is in Joules per second, another name for 1 Joule/sec is 1 Watt. Watts are used for power generally, not only for electricity, thus a car engine can be specified in watts or kilowatts. In the footpound system power is specified in horsepower, where 1 HP = 745.7 watts, but in scientific work the usual unit used is just watts.
What is the dBm value of a 10milliwatt signal?
P(dBm) = 10log10(10mW) = 10dBm
How do you convert dBm to dB?
the first convert the power in dBm to MW, the define of dBm=10 log (P MW) -10 log ( 1mw). example: let P=-2 dBm convert this to dB? answer: Pmw= inv log(-2/10)=0.630mw*1000 micw/mw=630 microw 10log(630)=28dB
Convert 2.2 V pp to dBm?
20 dbm
Is DBM real?
Yes, DBM (data base management) is real.
What is 75 dBm converted into dBW?
dBw=dBm-30 then 75-30=45 dBw dBw=dBm-30 then 75-30=45 dBw dBw=dBm-30 then 75-30=45 dBw
Where can one learn about DBM outplacement?
DBM outplacement information can be located directly on the DBM website. You can also locate this type of information on career transition websites as well.
What is mic and line level audio?
Mic level is -56 to -40 dbm. Line level is either -10 dbm or 4 dbm. You need a preamp to amplify a microphone to line level.
What is the loss if input is -5 dbm and output is -10 dbm?
Gain = Pout - Pin = -10dBm - (-5dBm) = -5dB
Milliwatts to dbm conversion?
The 'm' in dBm means the power is referenced to 1mW. So, the power in dBm equals 10 times the log of the power in mW, or P(dBm) = 10*log(P(mW)/1mW). For example, 1W = 1000mW, so 10*log(1000/1) = 30dBm.
How do you convert dBm to watts?
dBm is defined as power ratio in decibel (dB) referenced to one milliwatt (mW). It is an abbreviation for dB with respect to 1 mW and the "m" in dBm stands for milliwatt. dBm is different from dB. dBm represents absolute power, whereas in audio engineering the decibel is usually a voltage ratio of two values and is used then to represent gain or attenuation of an audio amplifier, or an audio damping pad.
How do you convert the 1db to dbm?
dBm is defined as power ratio in decibel (dB) referenced to one milliwatt (mW). It is an abbreviation for dB with respect to 1 mW and the "m" in dBm stands for milliwatt. dBm is different from dB. dBm represents absolute power, whereas in audio engineering the decibel is usually a voltage ratio of two values and is used then to represent gain or attenuation of an audio amplifier, or an audio damping pad.
How do you convert 10W to dBm?
dBm us almost exactly the same as dB. The only difference is that there is a reference of 1 Watt = 0 dB, and 1 mW = 0 dBm. dBm is defined as power ratio in decibel (dB) referenced to one milliwatt (mW). It is an abbreviation for dB with respect to 1 mW and the "m" in dBm stands for milliwatt. dBm is different from dB. dBm represents absolute power, whereas in audio engineering the decibel is usually a voltage ratio of two values and is used then to represent gain or attenuation of an audio amplifier, or an audio damping pad. PdBm = 10*log10(1000*10W) = 40dBm
