Collins KWM-2/2A Carrier Balance Optimisation Suppressed Carrier Level Directly Affects Transmit Audio Quality The two-stage carrier suppression architecture, the balanced modulator null procedure, the first balanced mixer trim, and why the manual procedure is poorly explained — with a clear…
Collins S-Line ALC System — Theory, Faults & Wiring How the ALC Loop Works Across the S-Line Station: 75S-3C + 32S-3A + 30L-1 Common ALC interaction faults, the KWM-2A ALC connector wiring, and the complete signal flow from microphone to…
Collins Mechanical Filter Testing How to Verify Bandwidth, Shape Factor & Insertion Loss — With and Without a Spectrum Analyser Two complete test methods: Method A using a spectrum analyser with tracking generator, and Method B using only a signal…
Collins S-Line PTO Overhaul & Re-lubrication 70K-2 PTO — Cleaning, Capacitor Replacement, Shaft Seal & the Alcohol-then-Oil Lubrication Sequence The single most common restoration task across the entire Collins S-Line family — applicable to the 75S-1, 75S-3 series, 32S-1, 32S-3…
vk6ada.com.au • Collins Community Resources • April 2026 Collins Collectors AssociationTechnical Bulletins, Archives, and Community Resources — A Practical Guide The Collins Collectors Association (CCA) is the primary preservation organisation for Collins Radio technical documentation. It holds an active licence…
Collins KWM-2/2A Known Issues PTO Service, T/R Relay Wear, ALC/VOX Interaction, Carrier Balance Drift & Components That Must Be Replaced The most-owned Collins S-Line transceiver deserves its own document — a consolidated Known Issues reference covering the unique challenges of…
Collins 75A-4 Known Issues & Top Components to Replace The Seven Deadly Caps, BFO Injection Level, Detector Diode Aging & IF Transformer Core Crumbling The receiver that bridges the 51J era and the S-Line — a consolidated restoration reference with…
Crystal Filters & Mechanical Filters — A-Line Receivers, KWS-1, R-388, R-390 & R-390A Collins IF Selectivity Filter Master Reference Crystal Filters & Mechanical Filters — A-Line Receivers, KWS-1, R-388, R-390 & R-390A Comprehensive specifications, part numbers, bandwidth positions, and operational…
vk6ada.com.au • Collins S-Line Technical Reference • IF Filter Guide Collins S-Line and KWM-2/KWM-2ACrystal and Mechanical Filter Comprehensive Reference — All Part Numbers, Specifications, BFO Crystals, and Equipment Cross-Reference A definitive reference for the 75S-1, 75S-2, 75S-3, 75S-3A, 75S-3B, 75S-3C,…
vk6ada.com.au • Avionics Reference • ARINC 410 • 2-out-of-5 VHF COM • Definitive Edition April 2026 ARINC 410 Two-out-of-FiveVHF Airborne COM TransceiversCollins, King, and Bendix — Fact-Checked and Enriched Definitive Reference — Revised with Jan SP5XZG’s Observations ARINC Characteristic 410…