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, making it 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 (170Hz / 425Hz / 850Hz)
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

Condition

Pre-Owned / Previously used
May show cosmetic wear from normal use
Untested accessories or cables may not be included unless stated
Ideal for restoration, vintage operation, or collector use

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.