Marco is referring I think only to the use of the cw ID while using the short message format on 2 meter msk144. On that band/mode operators do not exchange signal reports and turn to the short message format (known as Sh) to complete a meteor scatter qso with quickly decaying meteor trails. Time is of the essence. However, a monitoring station often can not decode the callsigns of stations using the Sh format. With this in mind, two meter meteor scatter operators, when involved in a particularly long qso, will use the cw-id to identify their station to comply with regulations. Meteor scatter contacts on 2 meters can take a long time, I've seen them last a hour or more.
Sometimes the use of the SWL format, (ticking the SWL box in MSK144) will reveal the callsign of the station using the Sh format, but sometimes it does not. Hence he use of the cw-ID. 73,Andy, ka2uqw
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