The MFJ-1224 RTTY/CW Computer Interface is a classic digital-mode interface designed for amateur radio operators who want to connect their transceiver to a computer for RTTY, ASCII, and CW communications. This versatile interface converts received CW or AFSK tones into computer-compatible TTL signals and also converts computer-generated signals into transmit audio or CW keying for on-air operation. Popular among vintage digital-mode enthusiasts and experimenters, the MFJ-1224 supports a wide variety of older computer systems and ham radio software packages — an excellent accessory for retro amateur radio stations, collectors, or digital-mode hobbyists. Features Supports RTTY, ASCII, and CW digital modes Interfaces radios with compatible computers and software Converts CW/AFSK audio into TTL-level computer signals Provides CW keying and AFSK transmit capability Adjustable RTTY shift settings (170 Hz / 425 Hz / 850 Hz) Built-in tuning and phase-lock indicators Direct and grid-block keying outputs Compatible with many vintage ham radio software packages and computer systems Typical Applications Amateur radio digital-mode operation RTTY and CW communications Vintage computer and radio interfacing HF and VHF digital experimentation Retro ham radio station setups Specifications Modes Supported: RTTY / ASCII / CW Input Voltage: 12 VDC TTL-level computer interface outputs Audio input/output connections for transceiver interfacing Adjustable PLL and filter controls Metal enclosure construction Pre-Owned Condition Notice Sold as-is — no returns or exchanges. Unit may show cosmetic wear such as light scratches or scuffs from prior use. All pre-owned units have been tested and verified functional prior to listing. The MFJ-1224 remains a respected interface among amateur radio digital-mode operators for its flexibility, classic design, and compatibility with a wide range of legacy computer-radio systems.
