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On off keying

B L BigDave BigDave Inglés 14 fichas

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1Define on off keying (OOK)Simplest form of amplitude modulating a carrier is keying on and off of a voltage according to a pre-arranged code
2Define telegraphic structure?The arrangement and polarity of elements employed to convey information
3Define element?A telegraphic code consists of code characters
(Polarity may be a mark of a space)
4Define mark and space?Mark = High voltage or binary 1
Space = Low voltage or binary 0
52 types of marking?Marking high
Marking low
6Morse code characters are of ....... legnths?Different
7Murray code characters are of .......... legnths?Identical (5)
8Define baud?Unit of telegraphic speed
(The number of elements transmitted in 1 second)
9Define element time duration (ETD)?The time taken for the duration of one element to be transmitted
10How would you work out element time duration (ETD)?1000/Bauds = ms
11Explain fundamental keying frequency (FKF)?In on-off keying the modulating frequency (fm) is known as the FKF.
(Expressed in Hz)
12How would you work out the FKF?Baud speed/2 = Hz
13on off keying (OOK) bandwidth?5 x Bauds
14On off keying (OOK) receiver bandwidth?3 x Bauds

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