Here are some examples

Perhaps most common – only one short

more short ones DJ9ZC, DL9DWJ, DL1DWI..

OK2ZW , SP2JYR, OK1MZM

at least SP2JYR, SP2MKO,PA5DD, PE1OXH, ON7EH, LA2PHA..,

Strange thing - August 2006 in north LA KQ41. Must be aurora or some other magn. disturbance, almost nothing opens,

only one call