Collins 51J-4 Known Issues & Fault Diagnosis General-Coverage Receiver: PTO Endpoint Drift, Oil Tub Capacitor Failures, AVC Anomalies & Mechanical Filter Issues Community-documented problems and proven fixes for the Collins 51J-4 lab-grade general-coverage receiver — covering the 70E-15 PTO, F500B…
Web-888 SDR Integration Series Collins 51J-4 Receiver + Web-888 SDR Integration The Easiest Integration in the Series — The 51J-4 Has a Factory 50Ω IF Output No internal modification required — the Collins 51J-4’s rear-panel IF OUTPUT connector (J104) provides…
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 Radio Commercial & Military Receiver Technical Archive Collins 51J-4 Commercial ReceiverFailure Prevention Kit — Component & Modification Design A complete engineering analysis of the ten predictable 51J-4 failure modes: power supply and paper capacitor ageing, Collins 500 kc…