On 2008-04-17, WingFlaps wrote:
Urban legend? O, it was not Newquay but Newlyn (both in cornwall). The
datum is sea level as set the British Admiralty back then so the
obvious Q code would have been QNH. Look up the history of the naval
tidal observatory if you don't believe it.

Source, please. The Q codes are just as Stefan said: randomly assigned.
They were chosen that way so as not to conflict with any nation's callsign
blocks (to this day, there are no callsigns assigned with Q as the first
letter). The apparent relationship between QNH and Newlyn Harbor is purely
coincidental.
--
Jay Maynard, K5ZC http://www.conmicro.com
http://jmaynard.livejournal.com http://www.tronguy.net
Fairmont, MN (FRM) (Yes, that's me!)
AMD Zodiac CH601XLi N55ZC (ordered 17 March, delivery 2 June)