text: Chapter 6
  BACKUP
  6-6. This includes--
  • HF radio.
  • UHF tactical satellite radios.
  • Secure cellular/satellite phones.
  TEAMS
  6-7. For internal communications, the LRS teams use secure LOS combat net radio systems. Secure,
  handheld, lightweight radios like the multipurpose and multiband inter/intra team radio (MBITR)
  incorporate frequency hopping (FH) and embedded communications security (COMSEC) that are
  compatible with the SINCGARS. These radios also allow communications with other Army and joint
  elements, including aircraft, and thus are ideally suited to LRS operations.
  Section II. RADIOS, COMPUTERS, AND THE BASE RADIO STATION
  R&S units that see everything and cannot report what they see are a wasted resource. The ability to
  communicate is the lifeblood of LRSU, and radios are the heart that make this possible. LRSU must be experts
  in the use of multiple radios systems and in the three primary military radio frequency spectrums: high
  frequency (HF), very high frequency (VHF), and ultra high frequency (UHF). LRS Soldiers must be highly
  proficient in programming, troubleshooting, and maintaining many types of radios.
  ELEMENTS OF SUCCESS
  6-8. Successful communications depend on—
  • The type of emission.
  • The amount of transmitter power output.
  • The characteristics of the transmitter antenna.
  • The amount of propagation path loss.
  • The characteristics of the receiving antenna.
  • The amount of noise received.
  • The relative sensitivity and selectivity of the receiver.
  • An approved list of usable frequencies within a selected frequency range.
  HF, VHF, AND UHF RADIOS
  6-9. These three radio wave spectrums combine to provide the primary and alternate means for LRSU
  to effectively communicate on the battlefield.
  HF RADIOS
  6-10. High frequency radios are harder to maintain than the commonly used LOS radios. However, they
  provide an unbeatable combination of reliability, economy, transportability, and versatility. Under ideal
  conditions, a HF radio using only 20 watts of transmitter power can successfully communicate over
  thousands of miles. Knowledgeable operators, backed by well-designed antennas and by propagation
  predictions from a propagation-engineering service, are key to successful HF radio system performance.
  Modern HF radios, such as the AN/PRC-138 and AN/PRC-150, incorporate the technologies of ALE, link
  quality analysis (LQA), embedded COMSEC, and digital modems are ideal for LRSU operations. These
  radios simplify HF communications and increase reliability and interoperability (Table 6-1).