Collins KWM-2 / KWM-2A Field Service Some KWM-2 / 2A Tricks A re-issue and enrichment of the January 2016 CCAE field-service article by Georges Ricaud, F6CER (CCAE #098), with primary-source cross-references for the Collins Collector community. Most of the KWM‑2 transceivers that turn up…
Choosing an SDR for the Collins KWM-2A Transceiver The fifth in the Boatanchor SDR series — and the receiver Collins already built with external-receiver integration in mind. Companion articles: R-390A, Hammarlund SP-600, Collins 51S-1, and Collins S-Line 75S-1 / 32S-1…
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 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…
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 • Fault Diagnosis Series • Collins S-Line Transceiver Collins KWM-2 / KWM-2ASidetone Hum Fault Diagnosis — Injection Chain Analysis and Seven Ranked Candidates Hum in the KWM-2 sidetone is a distinct fault pattern isolated to the CW transmit injection…
vk6ada.com.au • Collins KWM-2 / KWM-2A Technical Series KWM-2 / KWM-2AFailure Prevention Kit — Component & Modification Design A complete engineering analysis of the ten predictable KWM-2/2A failure modes, with a structured two-tier component replacement kit, four preventive circuit modifications,…
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.…
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…
VK6ADA · Mike Peace · Vintage Collins Radio · r-390a.net Home › Collins Vintage Radio › Collins KWM-2 / KWM-2A Serial Number Guide Collins KWM-2 / KWM-2A — Serial Number & Production Guide VK6ADA Technical Reference · Collins Vintage Amateur…