Radar detectors use a superheterodyne receiver to detect these electromagnetic emissions from the radar gun, and raise an alarm to notify the motorist when a transmission is detected.
42.
Development of the pulsed, L-band transmitter was under Usikov, and Braude designed a superheterodyne receiver using a low-power magnetron as the local oscillator.
43.
This technique can be countered by shielding the intermediate frequency circuitry of superheterodyne receivers, or moving into software-defined radio using digital signal processors with no local oscillator.
44.
The superheterodyne receiver is used because of its stability, high sensitivity and it has relatively good anti-interference ability, a small package and the price is also cheaper.
45.
In a superheterodyne receiver the term is also sometimes used to refer to the mixer, the tube or transistor which converts the incoming radio frequency signal to the intermediate frequency.
46.
As the years went on, RCA either took over, or produced for itself, a large number of patents, including that of the superheterodyne receiver invented by Edwin Armstrong.
47.
An important and widely used application of the heterodyne technique is in the superheterodyne receiver ( superhet ), which was invented by U . S . engineer Edwin Howard Armstrong in 1918.
48.
Most other signals produced by the mixer ( such as due to stations at nearby frequencies ) can be filtered out in the IF amplifier; that gives the superheterodyne receiver its superior performance.
49.
In June 1940 RCA released its battery-operated "'Model BP-10 "', the first superheterodyne receiver small enough to fit in a handbag or coat pocket.
50.
Signal reception is invariably done via a superheterodyne receiver : the first stage is a " tuner " which selects a television channel and frequency-shifts it to a fixed intermediate frequency ( IF ).
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