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In telecommunications, and particularly in radio, signal strength transmitted signal is being received, measured, or predicted, at a reference point that is a significant distance from the transmitting antenna. It may also be referred to as received signal level or field strength. Typically, this is measured as signal electric field strength of voltage per length or signal power received by a reference antenna. Higher powered transmissions such as broadcasting use units of dB-millivolts per metre (dBmV/m). Very low-power uses such as mobile phones are most often expressed in dB-microvolts per metre (dBµV/m) or in decibels above a reference level of one milliwatt (eg − 80 dBm). Telecommunication involves the transmission of signals over a distance for the purpose of communication. ...
In telecommunications, transmission is the act of transmitting electrical messages (and the associated phenomena of radiant energy that passes through media). ...
In physics, the space surrounding an electric charge or in the presence of a time-varying magnetic field has a property called an electric field. ...
International safety symbol Caution, risk of electric shock (ISO 3864), colloquially known as high voltage symbol. ...
For other uses of this word, see Length (disambiguation). ...
Transmitter power output (TPO) is the actual amount of power (in watts) of RF energy that a transmitter produces at its output. ...
Nominal power is a measurement of a mediumwave radio stations output used in the United States. ...
Broadcasting is the distribution of audio and/or video signals which transmit programs to an audience. ...
For other uses, see Decibel (disambiguation). ...
The volt is the SI derived unit for electric potential and voltage (derived from the ampere and watt). ...
This article is about the unit of length. ...
For other uses, see Decibel (disambiguation). ...
The volt is the SI derived unit for electric potential and voltage (derived from the ampere and watt). ...
For other uses, see Decibel (disambiguation). ...
In broadcasting terminology 1 mV/m is 1000 µV/m, or 60 dBµ (often written dBu). For other uses, see Decibel (disambiguation). ...
- Some examples
- 100 dBµ or 100 mV/m: blanketing interference may occur on some receivers
- 60 dBµ or 1.0 mV/m: Is considered the edge of a radio station's protected area in North America
- 40 dBµ or 0.1 mV/m: the minimum strength at which a station can be received with acceptable quality on most receivers
Blanketing is the interference caused by very strong radio signals. ...
For other uses, see Interference (disambiguation). ...
A radio station is an audio (sound) broadcasting service, traditionally broadcast through the air as radio waves (a form of electromagnetic radiation) from a transmitter to an antenna and a thus to a receiving device. ...
Formula The electric field strength can be calculated from the effective radiated power, ERP,[1] of the antenna and its distance, d (here, based on a resistance of 50 Ω): This article does not cite any references or sources. ...
where E is in volts per metre, and d is in metres.
Cellphone signals Although there are cell phone base station tower networks across many nations globally, there are still many areas within those nations that do not have good reception. Some rural areas are unlikely ever to be effectively covered since the cost of erecting a cell tower is too high for only a few customers. Even in high reception areas it is often found that basements and the interiors of large buildings have poor reception.
Weak signal strength can also be caused by destructive interference of the signals from local towers in urban areas, or by the construction materials used in some buildings causing rapid attenuation of signal strength. Large buildings such as warehouses, hospitals and factories often have no usable signal further than a few metres from the outside walls. Interference of two circular waves - Wavelength (decreasing bottom to top) and Wave centers distance (increasing to the right). ...
This is particularly true for the networks which operate at higher frequency since these are attenuated more rapidly by intervening obstacles, although they are able to use reflection and diffraction to circumvent obstacles. For other uses, see Frequency (disambiguation). ...
Look up reflection in Wiktionary, the free dictionary. ...
The intensity pattern formed on a screen by diffraction from a square aperture Diffraction refers to various phenomena associated with wave propagation, such as the bending, spreading and interference of waves passing by an object or aperture that disrupts the wave. ...
Cell phones in the U.S. operate at around 800 MHz and PCS phones at 1900 MHz, classified as UHF and low energy microwaves respectively. This has led to the rapid growth in the home cellular repeater market. The more advanced models now typically include an external directional antenna and an amplifier (usually operating at 55 dB gain) – which is generally enough to turn a very weak signal into a clear one over the local area (from around a thousand square feet to over twenty thousand). This article is about the SI unit of frequency. ...
Personal Communications Service or PCS is the name for the 1900-MHz radio band used for digital mobile phone services in Canada and the United States. ...
Ultra high frequency (UHF) designates a range (band) of electromagnetic waves whose frequency is between 300 MHz and 3. ...
Microwave Slang for small waves, like at a beach, often used by surfers. ...
A compact Clear Voice cellular repeater including a directional antenna, an amplifier and a monopole rebroadcast antenna. ...
Log-periodic dipole array A directional antenna is an antenna which transmits or receives maximum power in a particular direction. ...
A linear amplifier is an electronic circuit whose output is proportional to its input, but capable of delivering more power into a load. ...
In electronics, gain is usually taken as the mean ratio of the signal output of a system to the signal input of the system. ...
References - ^ Field Strength vs. Radiated Power
See also A cellular radio network is a radio network made up of a number of radio cells (or just cells) each served by a fixed transmitter, normally known as a base station. ...
Motorola T2288 mobile phone A mobile phone is a portable electronic device which behaves as a normal telephone whilst being able to move over a wide area (compare cordless phone which acts as a telephone only within a limited range). ...
Dropped call is the common term for a wireless mobile phone call that is terminated unexpectedly as a result of technical reasons. ...
A compact Clear Voice cellular repeater including a directional antenna, an amplifier and a monopole rebroadcast antenna. ...
Dead zones are areas where cell phones cannot transmit to a nearby cell site, base station, or repeater. ...
External links Cell Phone Signal Strength Map | 
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