PC-HFDL A data-link protocol that can be used by anyone.
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PC-HFDL Tags

protocol transmission radio transmission RTMPE protocol data-link protocol bandwidth frequency data-link cyanchat protocol SVDR Protocol appliance link protocol protocol data protocol sop

PC-HFDL Description

PC-HFDL is a Windows based decoder for the ARINC 635-3 HF data-link protocol. To receive these transmissions a good quality USB HF receiver is required; preferably one that can support a bandwidth of 2.8 Khz. ARINC 635-3 aka HFDL aka GlobeLink/HF is based on a number of interconnected ground stations. Each ground station transmits a frame called a Squitter every 32 seconds. The Squitter frame informs aircraft of the system status, provides a timing reference and provides protocol control. Each ground station has a time offset for its Squitters. This allows aircraft when trying to log on to jump between ground stations finding the best one as fast as possible. When passing traffic Time Division Multiplexing (TDMA) is used. This prevents two aircraft transmitting at the same time causing collisions.

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