CALL SIGNS AND CALL-UPS
Critical Task: None
In this lesson you will learn about call signs and how they are used to establish
TERMINAL LEARNING OBJECTIVE:
1. Identify the two categories of call signs.
2. Identify specific and general call-ups.
You will use the information provided in this subcourse.
To demonstrate competency in this task, you must achieve a minimum of 70
percent on the subcourse examination.
The material contained in this lesson was derived from the following
NSA Subcourse TA 103(U)
Radio stations must have some means of identifying each other regardless of the net
structure, operation, or type of frequency usage employed in the communication system. For
this reason, call signs are used in the same manner that you would use your name in a
conversation. For example:
PARTY #1: Hello, is John there? This is Steve.
PARTY #2: Yes, Steve , this is John. What do you want?
Call signs are actually communications names for radio stations in a link, group, or net. Just
as you identify yourself in a telephone conversation, radio stations identify themselves when
conducing intercommunication. This is especially important in the analysis of radio
communication, because it provides a basis for conducting studies on the routing of
messages, and in the reconstructing of the radio network.