Collins Commercial HF · Documentation Series The Collins HF-281 Transceiver Documents, Schematics, Parts, Repair & Restoration — A Resource Guide Mike Peace VK6ADA · r-390a.net and foxtango.org Administrator · vk6ada.com.au Rev. 4.1 · October 2026 · Living document — updated…
VK6ADA Technical Papers · Amateur Radio Service Bench · Alpha Amplifiers Alpha 9500 No-Power Diagnostic Guide After a 5 V Supply Short A structured fault-isolation procedure for an Alpha 9500 that still has a healthy replacement 5 V auxiliary supply…
Software spotlight · Yaesu FT-710 710 Console: a native Windows front panel for the FT-710 CAT control, the radio’s own scope over USB, two-way USB audio and code-paired remote operation, all from a single cable. Now in free open beta.…
Collins 75A-3 · Service Note · Power Supply & Bias Locating and Replacing C-96, the Back-Bias Bypass Capacitor The one 0.1 µF paper capacitor the factory manual shows on the schematic but never calls out in the underside photograph — and…
Troubleshooting Guide · Raspberry Pi 5 · RTL-SDR Blog V4 Most Common OpenWebRX+ Issues with Raspberry Pi 5 and RTL-SDR Blog V4 Where installs actually break, in order of likelihood — the one test to run first, and a copy-and-paste…
R-390A/URR · Restoration reference The R-390A Mechanical Filters: Selection, Sources and Testing Four Collins filters, six bandwidths, one capacitor that can destroy them — and where to buy, repair and test them in 2026 The R-390A/URR gets its reputation for…
The XCB-32: Building the Rarest S-Line Transmitter A reversible Extended Crystal Board kit that converts a Collins 32S-1 into a genuine-specification 32S-2 The Transmitter Art Collins Un-Named Ask a room full of Collins collectors to name every S-Line transmitter and…
Fox-Tango Era • Yaesu Linear Amplifiers Yaesu FL-2100 / FL-2100B / FL-2100ZTuned Input Circuit: SWR Expectations & the Mica Capacitor Problem What input SWR should a healthy 572B grounded-grid amplifier show — and which of the two input capacitor styles…
Boatanchor Legends · Tribute No. 50 Living Legend · Homebrew Master Dick Benson W1QG The engineer who retired, bought a $34 FPGA board, and built the Collins S-Line all over again — in silicon, in Simulink, and in salvaged HP…
Fox-Tango Legends — No. 007 Teruhiko Hayashi JA2SVZ The Man Who Kept the Counters Counting Every Fox-Tango Legend so far has kept the hybrid era alive with knowledge — survival guides, restorations, stewardship of the club itself. Teruhiko Hayashi, JA2SVZ,…