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Circuit diagrams, CB and HAM mods, alignments, data sheets and pinouts, a massive site with over 600 pages of free info

Galaxy web site updates and additions with modifications, diagrams, and schematics for galaxy radios

Cobra Grant Superstar Emperor Galaxy President Midland Uniden and more radio mods

Windows operated software and technical documentation for President CB-Radio`s

Programming software, diagrams, radio mods, secrets, service manuals for Motorola, Yaesu, Kenwood, Icom, Alinco. A large collection of ham radio equipment data also known as Ham.dmz.ro

Scanner and radio mods taken from qrz ham radio cd rom

Mods.DK serves as a central repository for **amateur radio modifications**, offering a substantial collection of user-contributed articles. Hams can find detailed instructions for various equipment, from transceivers by Yaesu, Kenwood, and Icom to microphones and power supplies. The database, currently holding 6230 articles, facilitates searching for specific equipment modifications, such as enabling out-of-band receive and transmit capabilities or integrating high-speed packet modems for enhanced data communications. Many entries focus on achieving better performance from existing gear, often detailing how to expand frequency coverage for MARS/CAP operations or optimize radios for 9600 baud packet. The site also includes repair instructions and general improvements for a wide array of HAM rigs and modems, reflecting a community-driven effort to share technical knowledge. Users are cautioned that modifications are not verified by Mods.DK and are undertaken at one's own risk, with potential legal implications depending on local regulations. The platform emphasizes community support, encouraging direct contact with authors or forum discussions for troubleshooting.

Rogerbird's Radio Modification Information, HR2510 or Lincoln Frequency Conversion Instructions, Mic Gain Modification, and more

Radio Mods, Technical Data, where to Purchase Equipment Amateur Repeater Coordination. All you need to build a repeater

Mods and articles collected by mods.dk

Kenwood TS-830 manual, tips and fixes

10 and 11 meter mobile DX and keydown antennas, radio and amp mods, pics, links, and much more.

Modifications for Icom IC-2100H by mods.dk

Conversion notes and amateur radio firmware especially for Finnish PMR radios and cellular phones like Nokia, Mobira and Benefon. Also some information for other European brands (Ericsson, Key Radio/Kyodo, Philips) and an extensive link collection.

VX-5R Loose antenna cure, Vx-5r Free Band, VX 5 R modification for German, VX-5R expanded frequency mod, VX-5R MARS/CAP & freeband mod

Some interesting mods for the 847

Thames Estuary DX Group based in SE England. Mods, links and radio contests throughout the year.

Mods for ICOM IC-706

Modifications collected by mods.dk

Radiomods.nz modifications page

This page describes two modifications W8WWV made to his AL-1200 amplifier. The mods were obtained from Ameritron, so they are official.

Site for radio, antenna, and scanner sales. There is also some useful information about mods and mic wiring.

mods for the Yaesu FT-100 by radiomods.co.nz

The Kenwood TH-F6A handheld transceiver can achieve an extended transmit frequency range of 137-174 MHz, 216-235 MHz, and 410-470 MHz by removing a specific diode and chip resistor from the main PCB. This modification also expands the receive range on the A-band to 142-152 MHz, 216-235 MHz, and 420-450 MHz. For the TH-F7E, the transmit range extends to 137-174 MHz and 410-470 MHz, with a corresponding receive range on the A-band. Performing these hardware changes will reset and initialize the radio's memory contents, necessitating prior backup of important channel frequencies. Instructions are provided for constructing a homemade PC programming cable compatible with the Kenwood TH-G71A, TH-F6A, and TH-F7E. The interface utilizes an RS-232-to-logic (0-3.3V) level-shifter and a full-duplex serial connection, adapting the Kenwood PG-4S cable schematic for the TH-G71's 2.5mm and 3.5mm phono plugs. Specific schematic tweaks include changing R1 from 150 ohms to 1K ohm to optimize power from the serial port and adding a 150K ohm resistor between the Radio TXD and ground to manage the 3.3V I/O pin. Detailed plug pinouts for the 2.5mm and 3.5mm connectors are presented, with the interface's TXD connecting to the ring of the 2.5mm plug and RxD to the shield of the 3.5mm plug. Ground connects to the shield of the 2.5mm plug, while the tips of both plugs are no-connects. Debugging procedures cover verifying positive and negative power rails from the serial port, checking component polarities, and testing level-shifting and inversion functions of the interface. Software setup involves enabling "TC ON" (Menu 15 for TH-G71, Menu 9 for TH-F6) and using Kenwood's MCP programming software.

Another good collection of TS-850 modifications

Collection of modifications notes for the Kenwood TS850

Collection of TS-50 mods, LCD display dark, TS50<-->AT50 communication, TS-50 Power Mod for QRP, TX Coverage mod TS-50, CAT control for TS-50S

Modifications for the Yaesu FT-920

Modifications and messages about the Yaesu FT-450

Radio mods for GE Phoenix radios to use in APRS applications

CB Radio and 10 meter Radio reviews & mods blog. Most articles are in Japanese

Modifications for the Kenwood TS-940, TS-940S LCD Clock Display Erratic Operation, Talk Power Improvement, erratic display, ALC mod

Problem width the memories, TS-570 Batteries, MARS/CAP Modification

TM-241A RX/TX mods The TM-421 a is capable of transmitting from 136 to 174 MHz when the following modification is performed

1500 watts PEP output from a Kenwood TL-922 amplifier requires careful attention to parasitic suppression and component selection to ensure stability and longevity. This resource critically examines common modifications, often based on anecdotal evidence rather than sound engineering principles, that can degrade performance or introduce new issues. It highlights how replacing aged components often gets misattributed to the efficacy of unnecessary modifications, leading to widespread misinformation within the amateur radio community regarding amplifier stability. The article details specific, effective modifications for the TL-922, such as shortening anode-to-chassis and anode-to-grid paths to improve VHF stability and efficiency. It addresses issues like incorrect capacitor types in the tank circuit, inadequate grid grounding, and poor RF sheet metal design, providing practical solutions like adding direct ground connections for the plate tune variable capacitor. The author also discusses proper parasitic suppressor design, emphasizing the importance of lead length and component selection for optimal performance and harmonic suppression, contrasting these with less effective or detrimental 'magical suppression kits'.

Collection of radio mods for Kenwood TS-870

FT-817 Radio Modifications, Improving the FT-817 Noise Blanker, increasing output power, using rechargeable cells, epanding frequency range

IC8POF's How To index, Hamradio mods, Crazy PA Tuner project (transform any manual amplifier in an automatic one).

radiomods.co.nz modifications for the Kenwood TS-450

Kenwood TH-D7a TX band modification

Modifications for the Kenwood TS-870S

Throughput improvement for the FT726R - Tapr PSK modem

Extending frequency to FT-290R for transverter use

This is a group for CBers, Sidebanders, Amateurs and Freebanders. Items to be discussed are CB, Skip, Skeds, DX communications, SSB, export radios, Radio equipment, mods, ham radio, repairs, electronics, CW, PSK31, RTTY, digital, and different radio shops.

Ham radio Blog, focusing on homebrewing and testing antennas, rig mods and contesting.

Kenwood TS 990S, Military Auxiliary Radio System modification

Unfilter LF output from the TH215/415 kenwood portable radio

Kenwood TM-201/401 Increased TX Audio, mod for microphone gain

Adding a full power output 12 meter band capability to the Yaesu FL-2100 despite of 10 meter.

Expanding tx range of a TH-D7A