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FADING :
Temporary reduction in the strength of wireless signals.
F.A.G. :
Short for frequency allocation group.
FALSE :
1. Obtained by non-carrying addition or subtraction.
2. Provisional.
FALSELY :
Without carrying, i.e. in the normal cryptographic manner.
FAST WHEEL :
That wheel of a cipher machine which has the most movement, usually the
wheel which moves forward for each letter that is enciphered; (in Enigma
this is the right-hand wheel).
FEMALE :
The same constatation occurring at two different positions.
FID :
A line of subtractor key from a previous set of subtractor tables or the
like used unchanged in a subsequent set, esp. when the latter are formed
from the former merely by a typographical rearrangement of lines.
FILLER :
Any of one or more arbitrary letters, figures, or other symbols added
or inserted to complete, e.g. a five-figure group, usually at the end
of a cipher message when transmission is by five-figure groups.
FILL-UP :
FILTER :
To reduce or narrow down (reports of aircraft) to definite information
about hostile aircraft in the filter-room.
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