853 

Federal Aviation Administration, DOT 

§ 171.311 

(i) 

Function Formats (General). 

Each 

angle function must contain the fol-
lowing elements: a preamble; sector 
signals; and a TO and FRO angle scan 

organized as shown in Figure 5a. Each 
data function must contain a preamble 
and a data transmission period orga-
nized as shown in Figure 5b. 

(1) 

Preamble format. 

The transmitted 

angle and date functions must use the 
preamble format shown in Figure 6. 
This format consists of a carrier acqui-
sition period of unmodulated CW trans-

mission followed by a receiver synchro-
nization code and a function identifica-
tion code. The preamble timing must 
be in accordance with Table 2. 

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