SELCAL


in international aviation, selcal or selcal is a selective-calling radio system that can alert an aircraft’s crew that a ground radio station wishes to communicate with the aircraft.
selcal alphabet-audio frequency equivalents

a 312.6 hz
b 346.7 hz
c 384.6 hz
d 426.6 hz
e 473.2 hz
f 524.8 hz
g 582.1 hz
h 645.7 hz
j 716.1 hz
k 794.3 hz
l 881.0 hz
m 977.2 hz
p 1083.2 hz
q 1202.3 hz
r 1333.5 hz
s 1479.1 hz

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