Radio Modifications for Ham Radio Equipment
Find schematics and instructions for modifying ham radio transceivers, receivers, and accessories to enhance performance or add new features.
Many ham radio operators enjoy modifying their transceivers and other station equipment to improve performance, add new features, or adapt older radios for modern operating. These modifications often involve circuit changes, component upgrades, or custom wiring to enhance a radio's capabilities beyond its original design. This DIY approach allows hams to personalize their gear for specific operating needs, whether for contesting, DXing, or digital modes.
This section provides practical resources for various radio modifications, from simple audio circuit adjustments for better TX audio on radios like the Kenwood TM-201, to more complex projects such as installing an Inrad roofing filter in a Yaesu FT-920. Operators can find detailed instructions for adapting classic rigs like the ICOM IC-735 for DRM reception or modifying a Collins KWM-2 for serious CW operation. There are also guides for building custom cables and upgrading PA stages in older HF transceivers.
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Mods.DK offers a vast database of amateur radio modifications, including extended TX/RX, MARS/CAP, 9600 baud packet, and performance improvements. -
New PA stage for good old Atlas 350XL HF transceiver -
WA8MCQ modification for the Heathkit HW-7 transceiver -
Circuit diagrams, CB and HAM mods, alignments, data sheets and pinouts, a massive site with over 600 pages of free info -
Kenwood TM-201/401 Increased TX Audio, mod for microphone gain -
Collection of modifications for the Heath HW-7 -
Modification leaves nearly all of the existing Omni agc circuitry intact, simply add an audio detector which modifies the delay characteristics of the original system by G3IXQ -
Modifying the Collins KWM-2 for Serious CW Operation, Make this old SSB workhorse perform like it should on CW. -
Extend frequency coverage on the Kenwood TS-680S transceiver -
The ICOM IC-745 is a durable 1980s HF transceiver, ideal for enthusiasts who enjoy restoration. While lacking modern serial control, it supports digital modes with modifications like sound card connections and frequency stabilization. Enhancements like an RTL-SDR panadapter can also be added, making it a versatile and valuable radio for contemporary use.