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N4ATS - Devoted to the Yaesu FL-7000 Amplifier. I have been rebuilding, repairing, and applying modifications to the Yaesu FL-7000 amplifier for 15 years. Over 200 units completed and counting!

F5DQK repairing and swr measurement tests of a Cushcraft R7 Antenna

Notes and details on repairing Traps on Cushcraft A3S

Repairing and restoring a Yaesu FL-2100Z amplifier

Used in the Kenwood TM-241, TM-741 2m module by W3KKC

A selection of radio collectors from all around the world interested in collecting, repairing, restoring, trading, selling parts, radio magazines, advertising collectibles, old records and technical talk.

Tower erection service, modifications, replacement, repairing service

Notes on the Troubleshooting and Repair of Small Switchmode Power Supplies

Repairing and restoring a Tektronix 465 oscilloscope

Maintenance of Antenna Tower Systems, Antenna tower foundation analysis and repair, Tower troubleshooting and repairing

W8TN article on repairing an Alpha 87a power amplifier

Repairing a Cushcraft R7000 antenna featuring several problems, mostly concerning coils and the insulating parts of the antenna.

Drake Radio Service & Repair, Refurbishing Services

Repairing a KAM interface changing two capacitors and transistors by IK5PWC

Repairing an Anritsu MS2711A handheld spectrum analyzer

Repairing the RJ45 plug end of the mic cable of a Alinco DR-605 dual band mobile transceiver. Alinco microphones are well known for the cable jacket getting brittle and breaking

An FT-817 ceased transmission on the VHF 2m band, despite the other HF, UHF, and 50 MHz bands operating correctly. Suspecting an excess of input signal during FT-8 mode transmission, they conducted measurements with an oscilloscope, revealing a burnt-out PIN diode, identified as D3003, type HSU277, on the PA unit board. Following the replacement of this surface-mounted diode, their FT-817 resumed operation on the 144 MHz band.

Repairing a non-functional Yaesu FT857 by identifying and replacing two damaged components crucial for powering the device. Using discrete components, author constructed replacements for the DAN222 and RT1N241 ICs, successfully restoring the rig's functionality. This DIY approach not only fixed the issue but also provided a satisfying and cost-effective solution

The author fixed a friend's Kenwood TS-850S radio, which suffered from Capacitor Plague, a common problem in 1990s electronics where capacitors leak and damage circuit boards. The CAR board, responsible for generating signals, was especially affected. The author cleaned the board, replaced the capacitors, and repaired a broken trace. Although the radio mostly functioned afterward, the "Slope Tune" control behaved abnormally. The cause seems to be a software issue, not a hardware one.

This page contains detailed notes on repairing and aligning the Kenwood TS-440S HF radio. The author shares their experience repairing several TS-440S radios, highlighting common issues and repair techniques. The page also discusses parts availability, modifications, and the radio's performance for digital modes like FT8 and JT65. Aimed at ham radio operators interested in repairing and maintaining vintage HF radios, this page provides valuable insights and tips for working on the Kenwood TS-440S.