text: Communications
  VHF RADIOS
  6-11. These are generally simple to use and provide reliable and clear, short-range tactical
  communications. The SINCGARS series of radios provide tactical units excellent communications that is
  easy to secure from enemy eavesdropping.
  Table 6-1. Radios that work with AN/PRC-150 in various security modes.
  KY-57
  HF VHF PT CT External LOS NLOS
  AN/PRC-148 MBITR X X X X
  AN/PRC-152 X X X X
  AN/PRC-119 X X X X
  SINCGARS
  AN/PRC-117A/D/F X X X X
  AN/PRC-113 X X X X X X
  AN/PRC-138 X X X X
  AN/PRC-112A/C X X X
  MX-300B6/B12 X X X X
  TR720A/B/C X X X
  Saber 5/G6 X X X X
  PSC-5C/D X X X X X
  LST-5C X X X X
  UHF RADIOS
  6-12. These provide reliable tactical (LOS), operational, and strategic communications. However, due to
  the high demand and to potential interoperability problems with other units, it is not always practical for
  LRSU to use this spectrum.
  PRIMARY, ALTERNATE, AND CONTINGENCY RADIOS
  6-13. The COB and AOB maintain long-range communications with employed teams using HF and
  UHF TACSAT radios. For single-channel HF radio systems, each team should have a separate frequency.
  However, due to ever-changing ionosphere conditions and competition for frequencies, two teams might
  have to share a single frequency. If so, the COB should set up primary, alternate, and guard frequencies;
  use the primary and alternate frequencies for scheduled communications traffic; and use the guard
  frequency only for priority traffic--
  • To report ISR tasks.
  • To request extraction and fire support.
  • To request medical evacuation.
  6-14. The LRSC communications platoon leader must carefully design HF networks that use ALE. To
  ensure network reliability, he must analyze in detail the number of deployed teams, the availability of
  frequencies, the distances between stations, and the configurations of radio sets. Since ALE and
  3G-capable radios automatically choose the best frequency for a particular radio path, he should program
  separate day and night channel groups to speed link establishment.