[CQ-Contest] How frequent to ID? Every QSO? No way!

[Tom Osborne]

Or another case, the guy is sitting there to work you and he calls without 
knowing your call.  You do the exchange and he asks, "yer call?"   Not much 
time saved there.

> A second effect is the number of times there is a station ready to call 
> you that would reply if you sent your call sign, but when no call sign is 
> sent he waits silently until after you send a CQ. Again, this need only 
> happen a small fraction of the time to start to become significant in 
> terms of total time lost.