The model A-33 RCA is 1939-40
heterodyne fiber optic system?
Het is short for heterosexual, heterogeneous, or even heterodyne.
Josef Stricker has written: 'Electronic heterodyne moire deflectometry' -- subject(s): Electronics 'Deferred electronic heterodyne moire deflectometry' -- subject(s): Heterodyning (Electronics)
Perhaps this will help? http://en.wikipedia.org/wiki/Heterodyne
One of these types of teeth are called heterodyne. The heterodyne teeth are the kinds of teeth that mammals have.
Shigeyuki Otsuki has written: 'Development of a heterodyne harmonic analyzer in the audible frequency range with automatic sweep' -- subject(s): Physics Theses
A superheterodyne receiver is a Radio Frequency receiver method that multiplies the received signal frequency with a local oscillator frequency to get frequencies that are the sum and difference of the 2 frequencies. For example, if the received signal is 5MHz and the local oscillator frequency is 4MHz, they are multiplied together. 1MHz and 9MHz frequencies would be gotten. Usually the 1MHz is the Intermediate Frequency (IF). It will be admitted (through a band pass filter) later passed through the required electronic circuits for proper processing. There is also the method of the Variable Tuned Filter.
I persume you mean the Giant Meterwave Radio Telescope (GMRT) in India. The way a received signal is processed is equivalent to the working principle of a double-super-heterodyne-receiver. That means that a received signal is filtered, mixed with another frequency and filtered again to downscale it for transport from telescope antenna to the observation room...here it is mixed and filtered again so that the signal is be downconverted for recording and data analisys.
It takes a super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super super long time. Even longer time than SPELLING what is written! =)
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The underwater telephone also known as UQC , or Gertrude was developed by the US Navy in 1945. the UQC underwater telephone is used on all manned submersible in operation. Voices communicated through the UQC are heterodyne to a high pitch for acoustic transmission through water