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transmission and reception near Seattle (KLB), that can receive SSB
transmissions from subscribers sailing the Atlantic and Pacific Oceans
north of the equator and connect them with any telephone in the
world.
SIMPLEX ITU channels have been “split” to offer ship-to-ship and ship-
to-shore communications. The US Coast Guard and other rescue
agencies throughout the world listen for transmissions on those ITU
simplex channels that end with “50”.
ITU 450
ITU 650
ITU 850
ITU 1250
ITU 1650
Ship-to-ship simplex channels end with ITU numbers like “51”, “52”,
and “53”, i.e. 451, 851, and 1252. But then again, ship-to-ship
channels may also be listed by frequency in kilohertz, and then AGAIN,
with a designator, like “4 ALPHA”, and then aqain, “4-1”.
CONFUSED WITH ALL THESE NUMBERS? You go to the instruction
manual, and nearly go over the edge when popular ship-to-ship
channel “4 ALPHA”, regularly used by race committees, is listed as
“bus and op” (Business and Operational). Say what?
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