There's another strange 'cluster spotting' phenomenon that I don't
understand at all. Tonight, LZ4UU was on 40 cw sending his or her
call frequently. There were 4 consecutives spots for LZ1UU (not 4)
on exactly the same freq (7001.5) at 0211, 0217, 0219 and 0220 UT
by four (apparently) different people. The station always sent 4,
never 1, while I was listening. How does one explain that?

Derek
aa5bt