CPRM Lisboa: Another mystery signal solved
by Thomas from The SWLing Post on (#5163J)
In response to our latest mystery utility signal challenge, SWLing Post contributor, Dean Bianco replies: This is the musical marker for CPRM Lisboa, a radiotelephone terminal that provided overseas telephone and telegraph communications in the days prior to satellites. I remembered the non-broadcast HF frequencies being loaded to bursting with many of these radio services. ["]