![aitra fm 11 aitra fm 11](https://www.globalsecurity.org/military/library/policy/army/fm/11-45/fig4-15.gif)
Output power is selectable between 100 and 400 watts. (2) Power amplifier AM-6545A provides final output power. The coupler automatically matches the impedance of the vehicular whip antenna. It provides the same function as the coupler section of the amplifier/coupler in the low-power version. (1) Antenna coupler CU-2064 is part of the high-power model. The items are the same in the A and B versions. The following devices are components of the radio set AN/GRC-193A ( Figure 6-3). Figure 6-2 shows the AM-7152 as part of radio set AN/GRC-213.ĭ. The amplifier-power supply AM-7152 provides the power to operate an external speaker and the required voltage sources to power the radio and accessories. The amplifier/coupler is part of radio sets AN/PRC-104 and AN/GRC-213.Ĭ. The coupler device provides audio signals verifying the tuning is complete. In most cases, the tuning takes 3 seconds or less. The coupler circuit automatically tunes the antenna to the radio's operating frequency. The amplifier section boosts output from the RT-1209 up to 20 watts peak. The amplifier/coupler AM-6874 provides final output amplification and antenna matching. The RT can be set for RECEIVE ONLY to prevent unintentional transmissions during radio listening silence.ī. IHFR accepts input of voice and data rates up to 2,400 bps when used with appropriate data modems. An experienced AM-DSB radio operator can receive the SSB signal using special procedures specified in FM 24-18. IHFR is not directly compatible with older generation AM double sideband (DSB) radios. However, it is only compatible when operating in the upper sideband mode. This makes it compatible with all currently fielded US and allied SSB radio systems. It operates over the frequency range from 2 to 30 MHz in 100 Hz increments. It is an SSB radio that can operate in either the upper or lower sideband. Figure 6-1 shows the RT and the amplifier/coupler described below. The primary component of IHFR sets is the RT-1209. When using IHFR, all transmissions should be secured with an approved cryptographic system.Ī. It will also be used in combat, CS, and CSS Armywide. It replaces the stand-alone AN/GRC-106 and the AN/PRC-70/74. Fielding for IHFR is different from SINCGARS in that IHFR is a replacement system and a new capability system. The components that make up the different radio configurations are similar from set to set. IHFR, like SINCGARS, is a modular design radio.