MFJ RTTY/CW Computer Interface Model MFJ-1224 (Pre-Owned)
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.