852 

14 CFR Ch. I (1–1–19 Edition) 

§ 171.311 

(h) 

TDM cycle. 

The time periods be-

tween angle transmission sequences 
must be varied so that exact repeti-
tions do not occur within periods of 
less than 0.5 second in order to protect 
against synchronous interference. One 

such combination of sequences is 
shown in Figure 4 which forms a full 
multiplex cycle. Data may be trans-
mitted during suitable open times 
within or between the sequences. 

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