Flashcards
On off keying
Cards in this deck (14)
- 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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- BigDave BigDave (Topics) Flashcards on On off keying, created by B L on 13/02/2017.
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