However in many cases the input source's noise temperature is much higher, such as an antenna at lower frequencies where atmospheric noise dominates.
12.
The development of FM broadcasting improved fidelity by using a greater bandwidth which was available in the VHF range, and where atmospheric noise was absent.
13.
Reception of NDBs is also usually best during the fall and winter because during the spring and summer, there is more atmospheric noise on the MF bands.
14.
AGC not only prevents atmospheric noise ( white-noise static ) from marring a received signal, it also prevents overloading of audio stages when a strong signal is received.
15.
Using seeds of sufficiently high entropy obtained from key stroke timings or electronic diode noise or atmospheric noise from a radio receiver tuned between stations should solve the problem.
16.
Like AM, an ASK is also linear and sensitive to atmospheric noise, distortions, propagation conditions on different routes in PSTN, etc . Both ASK modulation and demodulation processes are relatively inexpensive.
17.
Receiving antennas do not have to be as efficient as transmitting antennas since the signal to noise ratio is determined by atmospheric noise, so antennas small in comparison to the wavelength can be used.
18.
At those lower frequencies atmospheric noise ( static ) and man-made noise ( interference ) dominate over the noise generated inside the receiver itself ( " thermal " or " Johnson noise " ).
19.
In radio communication and electronics, this may include thermal noise, blackbody, cosmic noise as well as atmospheric noise from distant thunderstorms and similar and any other unwanted man-made signals, sometimes referred to as incidental noise.
20.
Small loop antennas are lossy and inefficient, but they can make practical receiving antennas in the medium-wave ( 520 1610 kHz ) band and below, where the antenna inefficiency is masked by large amounts of atmospheric noise.
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