MIL-STD-187-721 Interoperability And Performance Standard For Advanced Adaptive Hf RadioThe purpose of this document is to describe the technical parameters for adaptive high frequency HF radio that are more advanced than those described in MIL-STD-188-141. The advanced technology contained in this standard will guide the planning of military adaptive HF radio network technology into the 21st century. To fully understand and utilize this document, it is necessary to refer to portions of MIL-STD-188-141.

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MIL-STD-187-721D

(3)  Use the SINAD code to select a row in table X.

(4)  Find the column in that row that includes the PBER code; the spectral distortion region number at the head of that column is the spectral distortion value for that word. The spectral distortion value is 7 ("no measurement") if either SINAD or PBER is unknown (code 31), or if the SINAD code is 0 ("no signal").

5.5.1.4  Error-free interval.

The word error statistics described in table XI shall be obtained from the receiving Golay decoder and ALE protocol (errors which cannot be corrected in either or both Golay words or in the

entire ALE word, count as one word error).  Each of the counts shall be accumulated separately for each of the four epochs.  The estimated error-free interval on a channel for any

epoch shall be computed as follows:

2P      Total errors

P      Burst  errors

e         Total words

EFI

b

(1/ Pe )   1.

Total

errors

1   Pb

31

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