The AN/ARC-190 is an airborne HF communications system, found on C-130, C-20, KC-135, C-141, C-5, C-9, KC-10, B-1, B-52, C-17, E-3, E-4, E-8 JSTARS, F-15, F-16, H-53, H-60, and S-2T aircraft.
The ARC-190 is a military HF radio
that operates between 2-30 MHz
and transmits at 300+ watts
. It features a dual heterodyne
receiver/transmitter that uses IF
frequencies of 97.8 and 1.8 MHz, an antenna coupler that is pressurized to 7±1 PSI
with dry nitrogen (air) which (1) prevents high voltage arcing, (2) prevents corrosion, (3) provides a uniform cooling medium, and one of various controls which provide access to 30 preset channels, 30,000 normal channels, test functions, squelch, power on/off, and one of 8 modes of operation: UV (Upper Voice
), LV (Lower Voice
), UD (Upper Data
), LD (Lower Data
), CW (Continuous Wave), AME (Amplitude Modulated
Equivalent), P (Preset) and A (not used).
In the late 90s, ARC-190 systems on various airframes underwent a modification to the Auto Communications System which included a new control panel and the ACS processor. The system was designed for long distance communications using ACS capable ground stations which would traffic calls via HF radio and commercial phone lines.