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dBm or dBmW (decibel-milliwatts) is a unit of level used to indicate that a power level is expressed in decibels (dB) with reference to one milliwatt (mW). It is used in radio, microwave and fiber-optical communication networks as a convenient measure of absolute power because of its capability to express both very large and very small values in a short form compared to dBW, which is referenced to one watt (1000 mW).
Since it is referenced to the watt, it is an absolute unit, used when measuring absolute power. By comparison, the decibel (dB) is a dimensionless unit, used for quantifying the ratio between two values, such as signal-to-noise ratio.The dBm is also dimensionless but since it compares to a fixed reference value the dBm rating is an absolute one.
The dBm is not a part of the International System of Units and therefore is discouraged from use in documents or systems that adhere to SI units (the corresponding SI unit is the watt). However, the unit decibel (dB), without the 'm' suffix, is accepted for use alongside SI units.[1]
In audio and telephony, dBm is typically referenced relative to a 600-ohm impedance,[2] while in radio-frequency work dBm is typically referenced relative to a 50-ohm impedance.[3]
Unit conversions[edit]
A power level of 0 dBm corresponds to a power of 1 milliwatt. A 10 dB increase in level is equivalent to a 10-fold increase in power. Therefore, a 20 dB increase in level is equivalent to a 100-fold increase in power. A 3 dB increase in level is approximately equivalent to doubling the power, which means that a level of 3 dBm corresponds roughly to a power of 2 mW. Similarly, for each 3 dB decrease in level, the power is reduced by about one half, making −3 dBm correspond to a power of about 0.5 mW.
To express an arbitrary power P in mW as x in dBm, or vice versa, the following equivalent expressions may be used:
Alternatively, using 1 W as the reference value instead of 1 mW
Below is a table summarizing useful cases:
| Power level | Power | Notes |
|---|---|---|
| 420 dBm | 1×1039 W | Cygnus A, the most powerful known source of radio waves [4] |
| 296 dBm | 3.846×1026 W | Total power output of the Sun[5] |
| 80 dBm | 100 kW | Typical transmission power of FM radio station with 50-kilometre (31 mi) range |
| 62 dBm | 1.588 kW = 1,588 W | 1,500 W is the maximal legal power output of a U.S. ham radio station.[6] |
| 60 dBm | 1 kW = 1,000 W | Typical combined radiated RF power of microwave oven elements |
| 55 dBm | ~300 W | Typical single-channel RF output power of a Ku-bandgeostationary satellite |
| 50 dBm | 100 W | Typical total thermal radiation emitted by a human body, peak at 31.5 THz (9.5 μm) Typical maximal output RF power from a ham radio HF transceiver |
| 40 dBm | 10 W | Typical PLC transmission power |
| 37 dBm | 5 W | Typical maximal output RF power from a handheld ham radio VHF/UHF transceiver |
| 36 dBm | 4 W | Typical maximal output power for a citizens band radio station (27 MHz) in many countries |
| 33 dBm | 2 W | Maximal output from a UMTS/3G mobile phone (Power class 1 mobiles) Maximal output from a GSM850/900 mobile phone |
| 30 dBm | 1 W = 1000 mW | DCS or GSM 1,800/1,900 MHz mobile phone.EIRP IEEE 802.11a (20 MHz-wide channels) in either 5 GHz subband 2 (5,470–5,725 MHz) provided that transmitters are also IEEE 802.11h-compliant, orU-NII-3 (5,725–5,825 MHz). The former is EU only, the latter is US only. Also, maximal power allowed by the FCC for American amateur radio licensees to fly radio-controlled aircraft or operate RC models of any other type on the amateur radio bands in the US.[7] |
| 29 dBm | 794 mW | |
| 28 dBm | 631 mW | |
| 27 dBm | 500 mW | Typical cellular phone transmission power Maximal output from a UMTS/3G mobile phone (Power class 2 mobiles) |
| 26 dBm | 400 mW | |
| 25 dBm | 316 mW | |
| 24 dBm | 251 mW | Maximal output from a UMTS/3G mobile phone (Power class 3 mobiles) 1,880–1,900 MHz DECT (250 mW per 1,728 kHz channel).EIRP for wireless LAN IEEE 802.11a (20 MHz-wide channels) in either the 5 GHz subband 1 (5,180–5,320 MHz) or U-NII-2 and -W ranges (5,250–5,350 MHz & 5,470–5,725 MHz respectively). The former is EU only, the latter is US only. |
| 23 dBm | 200 mW | EIRP for IEEE 802.11n wireless LAN 40 MHz-wide (5 mW/MHz) channels in 5 GHz subband 4 (5,735–5,835 MHz, US only) or 5 GHz subband 2 (5,470–5,725 MHz, EU only). Also applies to 20 MHz-wide (10 mW/MHz) IEEE 802.11a wireless LAN in 5 GHz subband 1 (5,180–5,320 MHz) if also IEEE 802.11h-compliant (otherwise only 3 mW/MHz → 60 mW when unable to dynamically adjust transmission power, and only 1.5 mW/MHz → 30 mW when a transmitter also cannot dynamically select frequency). |
| 22 dBm | 158 mW | |
| 21 dBm | 125 mW | Maximal output from a UMTS/3G mobile phone (Power class 4 mobiles) |
| 20 dBm | 100 mW | EIRP for IEEE 802.11b/g wireless LAN 20 MHz-wide channels in the 2.4 GHz Wi-Fi/ISM band (5 mW/MHz). Bluetooth Class 1 radio.Maximal output power from unlicensed AM transmitter per U.S. FCC rules 15.219[8] |
| 19 dBm | 79 mW | |
| 18 dBm | 63 mW | |
| 17 dBm | 50 mW | |
| 15 dBm | 32 mW | Typical wireless LAN transmission power in laptops |
| 10 dBm | 10 mW | |
| 7 dBm | 5.0 mW | Common power level required to test the automatic gain control circuitry in an AM receiver |
| 6 dBm | 4.0 mW | |
| 5 dBm | 3.2 mW | |
| 4 dBm | 2.5 mW | Bluetooth Class 2 radio, 10 m range |
| 3 dBm | 2.0 mW | |
| 2 dBm | 1.6 mW | |
| 1 dBm | 1.3 mW | |
| 0 dBm | 1.0 mW = 1000 μW | Bluetooth standard (Class 3) radio, 1 m range |
| −1 dBm | 794 μW | |
| −3 dBm | 501 μW | |
| −5 dBm | 316 μW | |
| −10 dBm | 100 μW | Maximal received signal power of wireless network (802.11 variants) |
| −13 dBm | 50.12 μW | Dial Tone for the Precise Tone Plan found on public switched telephone networks in North America |
| −20 dBm | 10 μW | |
| −30 dBm | 1.0 μW = 1000 nW | |
| −40 dBm | 100 nW | |
| −50 dBm | 10 nW | |
| −60 dBm | 1.0 nW = 1000 pW | The Earth receives one nanowatt per square metre from a magnitude +3.5 star[9] |
| −70 dBm | 100 pW | |
| −73 dBm | 50.12 pW | 'S9' signal strength, a strong signal, on the S meter of a typical ham or shortwave radio receiver |
| −80 dBm | 10 pW | |
| −100 dBm | 0.1 pW | Minimal received signal power of wireless network (802.11 variants) |
| −111 dBm | 0.008 pW = 8 fW | Thermal noise floor for commercial GPS single-channel signal bandwidth (2 MHz) |
| −127.5 dBm | 0.178 fW = 178 aW | Typical received signal power from a GPS satellite |
| −174 dBm | 0.004 aW = 4 zW | Thermal noise floor for 1 Hz bandwidth at room temperature (20 °C) |
| −192.5 dBm | 0.056 zW = 56 yW | Thermal noise floor for 1 Hz bandwidth in outer space (4 kelvins) |
| −∞ dBm | 0 W | Zero power is not well-expressed in dBm (value is negative infinity) |
The signal intensity (power per unit area) can be converted to received signal power by multiplying by the square of the wavelength and dividing by 4π (see Free-space path loss).
In United States Department of Defense practice, unweighted measurement is normally understood, applicable to a certain bandwidth, which must be stated or implied.
In European practice, psophometric weighting may be, as indicated by context, equivalent to dBm0p, which is preferred.
In audio, 0 dBm often corresponds to approximately 0.775 volts, since 0.775 V dissipates 1 mW in a 600 Ω load.[10] The corresponding voltage level is 0 dBu, without the 600 Ω restriction. Conversely, for RF situations with a 50 Ω load, 0 dBm corresponds to approximately 0.224 volts, since 0.224 V dissipates 1 mW in a 50 Ω load.
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Expression in dBm is typically used for optical and electrical power measurements, not for other types of power (such as thermal). A listing by power levels in watts is available that includes a variety of examples not necessarily related to electrical or optical power.
The dBm was first proposed as an industry standard[10] in the paper 'A New Standard Volume Indicator and Reference Level'.[11]
See also[edit]
References[edit]
This article incorporates public domain material from the General Services Administration document: 'Federal Standard 1037C'. (in support of MIL-STD-188)
- ^Thompson and Taylor 2008, Guide for the Use of the International System of Units (SI), NIST Special Publication SP811Archived 2016-06-03 at the Wayback Machine.
- ^Bigelow, Stephen. Understanding Telephone Electronics. Newnes. pp. 16. ISBN978-0750671750.
- ^Carr, Joseph (2002). RF Components and Circuits. Newnes. pp. 45–46. ISBN978-0750648448.
- ^'Cygnus A'. Encyclopaedia Britannica. Encyclopædia Britannica, inc. 2010. Retrieved 22 January 2020.
- ^'Ask Us: Sun'. Cosmicopia. NASA. 2012. Retrieved 13 July 2017.
- ^'Part 97 - Amateur Radio'. ARRL. Archived from the original on 2012-10-09. Retrieved 2012-09-21.
- ^[1]Archived 2016-12-22 at the Wayback Machine FCC Part 97 Amateur Radio Service - Rule 97.215, Telecommand of model craft, section (c).
- ^FCC Web Documents citing 15.219Archived 2011-11-06 at the Wayback Machine.
- ^'Radiant Flux of a Magnitude +3.5 Star'. Archived from the original on 2012-06-30. Retrieved 2009-07-22.
- ^ abDavis, Gary (1988). The Sound Reinforcement Handbook. Yamaha. p. 22. ISBN0881889008.
- ^Chinn, H. A.; D. K. Gannett; R. M. Moris (January 1940). 'A New Standard Volume Indicator and Reference Level'(PDF). Proceedings of the Institute of Radio Engineers. 28 (1): 1–17. doi:10.1109/JRPROC.1940.228815. Archived(PDF) from the original on 2012-02-13. Retrieved 2012-08-04.
External links[edit]
CALOOCAN CITY, Jan. 24 (PIA) -- The Light Rail Transit Authority (LRTA) is set to submit an 'initial report' to the Presidential Anti-Corruption Commission (PACC) on Monday, according to an official on Saturday.
During the Laging Handa public briefing hosted by the Presidential Communications Operations Office, LRTA Spokesperson Hernando Cabrera said the LRTA is investigating all its projects under the Procurement Service of the Department of Budget and Management (PS-DBM) two years after it began looking into the reported irregularities in the purchase of some of its equipment for the LRT 2.
Cabrera said Administrator Reynaldo Berroya has ordered the creation of a fact-finding committee that would investigate the agency's whole procurement process under the PS-DBM.
'Kasi ang nag-procure ng lahat ng ito, actually gumamit kasi 'yung sa pasilidad or tinatawag nating procurement service ng DBM para sila ang mamimili ng ating mga kaukulang equipment at lahat ito ay pinapa-imbestigahan ni Administrator Berroya,' he explained.
The official admitted that since they started the investigation in 2019, the LRTA only completed a report on the matter of the Rolling Stock Diagnostic Tools, but assured the public that the whole procurement process was being investigated.
He said the LRTA would submit its initial report to the PACC on Monday after its Chairman Dante Jimenez sent a subpoena to its office.
'We have been coordinating with the PACC. I personally went to PACC. I have brought a lot of documents to PACC. I have answered a lot of questions. Sabi ko nga, this coming Monday, I will be turning over a copy of our initial report. Full report na ito on one item, we will be fully coordinating with them,' Cabrera said.
The Presidential Anti-Corruption Commission had earlier said its investigation uncovered anomalies that warranted the filing of charges against LRTA officials and companies that took part in the bidding for the equipment.
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The PACC said re-railing and rolling stock diagnostic equipment delivered for LRT 2 turned out to be different from the equipment approved by the Bids and Awards Committee of the DBM.
In one instance, a crate containing re-railing equipment had a sticker printout identifying it as having been shipped by the Chinese firm CRRC Corp., as ordered by the winning bidder Kempal Construction and Supply Corp. The crate, however, contained equipment from Bemco, an Indian company.
Evidence 'indicates that the re-railing equipment did not come from CRRC but from Bemco,' the PACC said.
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It said it appears that the signature in the LRTA Inspection and Acceptance Report was forged, facilitating the switch of equipment.
The PACC also highlighted irregularities in the purchase of escalators for the LRT 2 stations. The LRTA had ordered escalators with a required capacity of 9,000 persons per hour, but the escalators that were delivered can only accommodate 6,000 persons per hour. The escalators also broke down long before the expiration of the two-year warranty period. (PIA NCR)