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4-4. Improved High Frequency Radio

The IHFR is a modular designed manpack or vehicular mounted radio operating at 2 to 30 MHz. It uses ground- and sky-wave propagation paths for medium- to long-range communications. The primary component of IHFR sets is the RT-1209. It is a single sideband (SSB) radio that operates in either the upper or lower sideband. Depending on the units' mission, the RT-1209 is combined with other components to create manpacked, vehicular, or fixed station radios. The components for the different configurations are relatively small, making the sets lightweight and versatile. IHFR accepts input of voice and data rates up to 2400 bps when used with appropriate data modems. IHFR passes highly perishable C2 information for medium- to long-range communications (50 to 300 kilometers). Brigade and battalion units primarily use the low-power version. All IHFRs are user-owned and operated. The Near Vertical Incidence Sky Wave (NVIS) Antenna, AS-2259/GR is an issued item with the IHFR's; however the NVIS antenna is interchangeable with the AN/GRA-50 and the whip antenna. The NVIS antenna may be remoted up to 61 meters (200 feet) from the radio set. Table 4-4 shows the IHFR characteristics.

Table 4-4. IHFR characteristics.

AN/PRC-104A. This radio set is a low power, lightweight, battery powered, tactical manpack configuration that replaces the AN/PRC-70/74 manpack radios. It weighs about 14 pounds and has automatic antenna tuning. The AN/PRC-104A will provide secure voice communications with the KY-65 or KY-99. See Figure 4-14. Its components are connected by quick-disconnect latches. The radio set consists of--

• Receiver-Transmitter, RT-1209.
  
• Amplifier/Coupler, AM-6874.
  
• Battery Case, CY-7875/PRC-104.

Figure 4-14. Radio set, AN/PRC-104A.

AN/GRC-193A. This radio set is high-powered and can be used in a vehicular or fixed station configuration. See Figure 4-15. IHFR sets perform retransmission for CNR when connected through the AN/VIC-1. Although more complex and bulkier than the other configurations, the AN/GRC-193A having strong output makes it ideal for long-range vehicular communications. The AN/GRC-193A radio is secured with the KY-65. Its components are--

• Receiver-Transmitter, RT-1209.
  
• Antenna Coupler, CU-2064.
  
• Amplifier/Converter, AM-6879.
  
• Power Amplifier, AM-6545A.
  
• Mounting Base, MT-6232.

Figure 4-15. Radio set, AN/GRC-193A.

AN/GRC-213. This radio set is a vehicular version of the 20 watt AN/PRC-104 radio and can be converted into a manpack configuration. The set includes three antennas: the whip, the doublet, and the NVIS antenna. The AN/GRC-213 will provide secure voice and data communications when used with the KY-65 voice or KY-99. See Figure 4-16. Its components are--

• Receiver-Transmitter, RT-1209.
  
• Amplifier/Coupler, AM-6874.
  
• Amplifier/Power Supply, AM-7512.
  
• Battery Case, CY-7152/PRC-104.
  
• Vehicular Mount.

Figure 4-16. Radio set, AN/GRC-213.

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