Joan/Eleanor

The code name for the first walkie talkie system, which comprised a ground unit, Joan,

and an airborne unit, Eleanor. The system allowed agents of the Office of Strategic Services (OSS), the predecessor to the Central Intelligence Agency (CIA), behind enemy lines to communicate with aircraft in a manner that virtually defied detection at the time. See also walkie talkie.

• hexadecimal notation (hex)
• hex (hexadecimal notation)
• HFC (Hybrid Fiber/Coax)
• HF (High Frequency)
• HF (High Frequency)
• high bit-rate digital subscriber line (HDSL)
• high capacity voice (HCV)
• high-cost area
• high definition television (HDTV)
• high density bipolar order 3 (HDB3)
• high frequency (HF)
• High-Level Data Link Control (HDLC)
• high-order mode
• high-pass filter
• High Performance Parallel Interface (HIPPI)
• high speed
• high-speed channel (H channel)
• High-Speed Circuit Switched Data (HSCSD)
• High Speed Downlink Packet Access (HSDPA)
• High Speed Uplink Packet Access (HSUPA)
• high-tier
• high voltage (HV)
• HiperACCESS (High performance radio ACCESS)
• HiperLAN/1 (High performance radio Local Area Network version 1)
• HiperLAN2 (High performance radio Local Area Network version 2)