If the dominant noise is generated within the measuring equipment ( for example by a receiver with a poor noise figure ) then this is an example of an instrumentation noise floor, as opposed to a physical noise floor.
42.
Planar triodes are better, but very early, transistors have reached noise figures substantially lower than tubes at UHF . Thus, the tuners of television sets were among the first parts of consumer electronics were transistors were used.
43.
As the front-end technology improved and the noise figure of the LNBs fell, the size shrank to a few years later, and continued to get smaller reducing to feet by the late 1980s and by the early 1990s.
44.
A typical LNA may supply a power gain of 100 ( 20 decibels ( dB ) ) while decreasing the signal-to-noise ratio by less than a factor of two ( a 3 dB noise figure ( NF ) ).
45.
The noise figure is then two, or 3 dB . For higher impedances, such as 250 k?, the EF86's voltage noise is 1 / 10 ^ { 1 / 2 } lower than the sources's own noise.
46.
The noise figure is defined as the ratio of the noise power at the output of the amplifier relative to the noise power that would be present at the output if the amplifier were noiseless ( due to amplification of thermal noise of the signal source ).
47.
In addition to their small size, the surface normal operation of VCSOAs leads to a number of advantages, including low power consumption, low noise figure, polarization insensitive gain, and the ability to fabricate high fill factor two-dimensional arrays on a single semiconductor chip.
48.
According to the equation, the overall noise factor, F _ { receiver }, is dominated by the noise factor of the LNA, F _ { LNA }, if the gain is sufficiently high . ( The resultant Noise Figure expressed in dB is 10 log ( Noise Factor ) .)
49.
This gave such a low noise figure that the Mariner IV space probe could send still pictures from Mars back to the Earth even though the output power of its radio transmitter was only 15 watts, and hence the total signal power received was only-169 decibels with respect to a milliwatt ( dBm ).
50.
They feature excellent VHF and UHF performance plus low noise figures, and were widely used throughout the 1960s in television sets ( beginning with RCA's " New Vista " line of color sets in 1961 with the CTC-11 chassis ), radio and high-fidelity equipment primarily in RF sections, and oscilloscopes.
