Amtor: Digital Mode Communication

Understanding AMTOR Operations

Austin
Reviewed by • Digital Modes & Software Editor • March 2026

AMTOR, or AMateur Teleprinting Over Radio, is a digital mode designed to enhance communication reliability in amateur radio. It improves upon RTTY by addressing its limitations, making it suitable for HF operations. Understanding AMTOR is crucial for operators seeking efficient data transmission in varying conditions.

Key concepts include AMTOR protocols, error correction techniques, and the historical context of its development. Familiarity with these elements is essential for effective use and appreciation of this mode in amateur radio communications.

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  • About AMTOR
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    About AMTOR
    AmTOR may be considered as the next development from RTTY. AmTOR was introduced to overcome the problems with RTTY. As a result of its performance, it has become popular on the HF bands because it gives more reliable communication, especially when interference is present. It achieves this by using a coding system that allows errors to be detected and corrected.
  • AMTOR demonstration
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    AMTOR demonstration
    Youtube video by PR7VX using AMTOR to test performance
  • Amtor mode
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    Amtor mode
    Information on Amtor mode with protocol details
  • Amtor the forgotten digital mode
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    Amtor the forgotten digital mode
    N4ZOU Article on AMTOR mode on eham.net
  • Operating AMTOR
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    Operating AMTOR — G4AON
    Putting one of those old modems back into use.AMTOR is an acronym for AMateur Teleprinting Over Radio and was mostly used on HF. The mode is based on the marine SITOR code that was introduced to amateur radio by Peter, G3PLX. The mode is an enhancement of RTTY with active error correction that copes reasonably well with interference and fading.