vk6ada.com.au • Collins R-390A/URR Technical Series R-390A/URRFailure Prevention Kit — Component & Modification Design A complete engineering analysis of the ten predictable R-390A failure modes, with a structured two-tier component replacement kit and four preventive circuit modifications to eliminate them…
vk6ada.com.au • Collins S-Line Technical Resources Collins Radio Equipment ManualsCCA Technical Archive Directory A complete mirror index of all Collins Radio equipment manual PDFs hosted by the Collins Collectors Association. Links open directly on the CCA server. No login required.…
vk6ada.com.au • Collins S-Line Safety Series Collins 516F-2 & S-LineThe Switched Neutral AC Power Design Defect A comprehensive guide for operators worldwide: why the 516F-2 presents a live mains hazard when switched off, how mains voltage, plug polarity and wiring…
vk6ada.com.au • Collins KWM-2 Technical Series Collins KWM-2 / KWM-2AVietnam Modification (SCED 11b) Complete process plan — PTO voltage stabilisation using a 150 V zener diode. Includes parts list with suppliers, step-by-step installation procedure, Quality Assurance plan, and pre-power test protocol.…
vk6ada.com.au • Collins Radio Heritage Series • Second Edition Prolific Authors ofCollins HF Radio Equipment Eight writers who documented the most revered name in amateur radio — from circuit notes to biography, from service bulletins to space history. All known…
Collins KWM-2 PTO Frequency Jump Troubleshooting Guide By VK6ADA • March 25, 2026 This guide documents the troubleshooting process for an intermittent 9 kHz frequency jump in a Collins KWM-2/2A transceiver that occurs after 1-2 hours of operation. Based on…
Wulfsberg Electronics & Collins Radio:Research Note — Second Edition Paul Wulfsberg • P.G. Wulfsberg at Collins Radio, Cedar Rapids (IEEE, 1963) • Paul Wulfsberg at King Radio (NASA, 1970) • Arthur F. Wulfsberg at Collins Radio (Apollo) • K.N. Wulfsberg…
Collins Radio Avionics —Historical Introduction Dates & Archive Resources Collins • 618M • 860E-1 (1961) • 51R-7A • VIR-30 • DME-40 • 51RV • ARINC 410 • Pro Line I / II / 4 / 21 / Fusion • EFIS-85/86…
Collins KWM-2 / KWM-2ARestoration Deep-Dive Arthur Collins’ Masterpiece • 1959–1977 • The Compact S-Line That Went to War Of all the rigs to emerge from Cedar Rapids, Iowa during the golden age of amateur radio engineering, the Collins KWM-2 occupies…
Alpha 87A Linear Amplifier:Restoration & Service Guide 3CX800A7 Tubes • PIN Diode T/R Switching • Microprocessor Control • Fault Code Reference • Cabinet & Safety 📝 VK6ADA Technical Papers 📅 March 2026 ⚡ 1,500 W Continuous — 3CX800A7 💻 Microprocessor Controlled…