Pipester wrote:
I was listening to 18.155 Mhz and Heard Hams, repeating callsigns over and
over again. What are they doing?

Most likely they are trying to attract the attention of a rare station.

The station calls CQ and includes "up 10" or (I am listening 10khz
higher than I am transmitting). The operator then picks on callsign
and replies to that ham, they exchange enough information to make
it a legal contact, and the operator moves on to another ham.

It's called a pileup, and the rare station is "working split".

The minimum information for most awards is callsigns and a signal
report each way. Some hams send "59" (very readable and very strong)
for voice or "599" (very readable very strong and very clean tone)
for CW (morse), most send a real report. Contests include a serial
number for the contact, and if sponsored by a group, the membership
numbers of the stations in that group.

More intersting splits occur on 80m (3.5mHz) and 40m (7mHz) because
U.S. hams are restricted where they can send morse code only and
where they can send morse and voice, but hams in other parts of the
world don't have those restrictions or are not allowed to send at
all on those frequencies.

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM
IL Voice: (07)-7424-1667 U.S. Voice: 1-215-821-1838
Visit my 'blog at http://geoffstechno.livejournal.com/