This modulation and amplifier technology family was originally marketed by RCA for AM broadcast transmitters.
McClatchy Broadcasting was a former group owner of AM, FM and TV stations as well as a California publisher of newspapers.
Radio Caroline has a working RCA BTA-50H on display aboard its radio ship Ross Revenge, however this transmitter has fallen out of use and is unlikely to be put back on the air since the Ross Revenge currently broadcasts via relay to a more efficient land-based transmitter.
[2] Other McClatchy AM stations like (KBEE, Modesto, and KMJ, Fresno, both of CA) employed conventional transmitters.
Ampliphase achieved a modest improvement in transmitter overall efficiency before other amplification and modulation schemes could replace it.
However, their design is implemented entirely in the digital domain, so avoiding the maintenance issues of the analogue Ampliphase transmitters.