General: Code in a PSK31 Signal

Which type of code is used for sending characters in a PSK31 signal? [G8C12]

A. Varicode
B. Viterbi
C. Volumetric
D. Binary

Alright, here we are again at a real head scratcher.  This is yet another example of something you just “need to know” for the test.  In real life you really wouldn’t use this information, although you’ll probably find yourself using PSK31 at some point.

PSK31 signals are encoded using A. Varicode.  It’s a fairly ingenious method where certain letters and characters use fewer bits than others, depending on their frequency of use.

For more information on Varicode, see the Wikipedia entry.

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