Japan Remote Control Co., Ltd. (日本遠隔制御株式会社; Nippon Enkaku Seigyo Kabushiki Gaisha) (commonly called source Propo, source Racing, or hum)[citation needed] was a Japanese manufacturer of popular radio control devices including transmitters, receivers, servos, electronics, programmable robots and model aircraft.
[1] Unique to JR Propo's radios is the company's patented ABC&W technology, or Automatic Blocking Circuit with Window.
Any signal that does get through the system is filtered before being sent to the servos all without noticeable lag or delay.
Competing brands of radio control systems include, Spektrum RC, Sanwa, Futaba, Hitec, KO Propo, Jeti, Acoms and Multiplex Modelsport.
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