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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - 44 - 45 - 46 - 47 - 48 - 49 - 50 - 51 - 52 - 53 - 54 - 55 - 56 - 57 - 58 - 59 - 60 - 61 - 62 - 63 - 64 - 65 - 66 - 67

MIL-STD-187-721D

5.13 System parameters by address. Not yet standardized.

5.13.1 Multiple frequency set operation. Not yet standardized.

5.13.2 Antenna selection. Not yet standardized.

5.13.3 Power selected by net authorization. Not yet standardized.

5.14 HF mail transfer protocol (HMTP). See MIL-STD-188-141.

5.15 Automatic location report CMD.

When location is reported by a second-generation ALE system, it shall use one of the following location report CMD formats.

5.15.1 Coarse location.

Position of the transmitter can be reported to within a 15° grid square using a single ALE word. When this precision is adequate the location CMD shall be formatted as shown on figure 30.

FIGURE 30. Coarse location CMD.

The Req bit shall be set to 1 to request a location report in response, or to 0 if no report is requested. The N bit shall be set to 1 if the position is in the northern hemisphere, or to 0 if in the southern hemisphere. The E bit shall be set to 1 if the location is in the eastern hemisphere, or to

0 if in the western hemisphere. The Lat Zone shall be set to the latitude divided by 15, rounded to an integer, in a range of 0 through 6. Lat Zone shall be set to 7 (111) to indicate unknown latitude. The Lon Zone shall be set to the longitude divided by 15, rounded to an integer, in a range of 0 through 12. Lon Zone shall be set to 15 to indicate unknown latitude; other values are reserved.