An orphaned rack-mount unit, recreated for the U.S. Navy and U.S. Coast Guard. The TCS 654 is a direct replacement (form, fit, and function) for the Harris RF-654-08 . This unit is approved for operation on shipboard, aircraft and land-based systems. The TCS 654 Multicoupler contains a high linearity amplifier section with internal HF bandpass sections, along with EMP protection and transient suppression circuitry . The unit contains automatic amplifier bypass on detection of high input level and automatic disconnect in the presence of high signal level . High IP3 and high amplifier linearity makes the unit an optimal choice for HF operations.