The prosign is used when a transmitting station wants all monitoring stations to be alert and "listen carefully" and to be prepared to "copy down" everything that follows ("Copy This").
Upon hearing receiving stations are to be prepared to "copy down" everything that follows ("Copy This"). The prosign is used when a transmitting station wants all monitoring stations to be alert and to "listen carefully".
The prosign is used when a transmitting station wants all monitoring stations to be alert and to "listen carefully". Upon hearing receiving stations are to be prepared to "copy down" everything that follows ("Copy This").
The prosign is used when a transmitting station wants all monitoring stations to be alert and to "listen carefully". Upon hearing receiving stations are to be prepared to "copy down" everything that follows ("Copy This").