In amateur radio, it is not immediately noticeable when one's own signal is being listened to, since listening to a radio channel is passive and the "eavesdropper" does not send out any signals. Therefore, there is no direct indication to the transmitting radio amateur that his signal is being received by another person.
The word "Roger" comes from the internationally used spelling alphabet and in radio communication means that the last message sent was received and understood. Originally, "Roger" stood for the letter "R," which was used for "received" in older versions of the alphabet. Although the spelling alphabet was changed and "Romeo" now stands for the letter "R", the use of "Roger" to confirm a received message has persisted in radio communications.
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