DTMF Dual Tone Multi-Frequency Resources and Projects
Find schematics, projects, and applications for DTMF (Dual Tone Multi-Frequency) in amateur radio communication and control systems.
DTMF, or Dual-Tone Multi-Frequency, is a signaling method widely used in ham radio for controlling repeaters, accessing remote bases, and sending commands to various station equipment. Operators use DTMF tones to activate specific functions, often from a handheld transceiver or mobile rig, making remote operation and network access convenient. This technology is fundamental for many common amateur radio activities, from simple repeater access to more complex remote control applications.
This category provides resources for understanding and implementing DTMF in ham radio stations. Hams can find projects for building their own DTMF keypads and tone decoders, useful for radios lacking built-in capabilities. There are also articles explaining how DTMF integrates with systems like EchoLink for remote control, and tools such as ComTekk Tone Generator for generating specific tones. Additionally, some resources cover the use of DTMF with APRS for specialized paging applications, expanding its utility beyond basic repeater control.
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CTCSS Decoder and Encoder, DTMF Decoder projects -
DTMF Keypad for radios without one. A project with picture and schematic diagrams to homemade a DTMF keppad -
This article describes how to build a general purpose DTMF decoder with a low-price chip from MITEL -
Converting local APRS data to DTMF paging format for display on the tens of thousands of DTMF Paging Radios. -
APRSTT translate-O-Matic convert online your callsign in DTMF -
Code Synthesizer for 2-way Radio Signaling works on Windows XP and Windows 7 -
About Continuous Tone Coded Squelch System. In the amateur radio community CTCSS encode is referred to as Tone in radio programming and CTCSS decode is referred to as tone squelch -
About usage of DTMF Dual Tone Multi Frequency in ham radio applications