Low-Noise Resistor Selection for Vintage Receiver, Transmitter, and Transceiver Restoration A practical reference for choosing replacement resistors in premium HF tube equipment — from receivers like the R-390A and SP-600, through transmitters like the 32S-1 and Apache TX-1, to transceivers…
The Boatanchor SDR Integration Series: Index and IF Buffer Amplifier Reference A consolidated index to the five SDR integration articles, plus a shared technical appendix on the buffered IF tap that most of them depend on. Over five companion articles,…
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…
Choosing an SDR for the Collins S-Line Station: 75S-1 Receiver and 32S-1 Transmitter The fourth in the Boatanchor SDR series — and the first to cover a complete transmitting station rather than a single receiver. Companion articles: R-390A, Hammarlund SP-600,…
Choosing an SDR Front-End for the Collins 51S-1: Factory Outputs, Foresight, and Mechanical Filters The third in the Boatanchor SDR series — and the easiest of the three receivers to integrate with a modern spectrum display. Companion articles: This piece…
Choosing an SDR Front-End for the Hammarlund SP-600: Variants, Architectures, and Companions A variant-aware guide to pairing the Hammarlund Super-Pro 600 with a modern spectrum display — because the SP-600 you own may not be the SP-600 the other fellow…
Choosing an SDR Front-End for the R-390A: A Comparison Matrix A field guide for pairing the Cold War’s finest analog HF receiver with a modern spectrum display. The R-390A/URR was the most precise general-coverage HF receiver the US military ever…
RFI Analysis & Mitigation Engineering Guide VK6ADA — Boatanchor & Solid-State Technical Library Collins HF-380 Transceiver RFI Analysis & Mitigation Engineering Guide Internal emitters, external ingress paths, ferrite selection, and installation-grade RFI engineering for the military/commercial variant of the KWM-380.…
Collins Solid-State Restoration Series · Commercial / Government Variant Collins HF-380 Transceiver — Tantalum Capacitor Replacement Reference Guide A risk-prioritised service reference for the ~200-unit commercial/military variant of the KWM-380, with specific attention to the high-duty-cycle service profile that distinguishes…
Boatanchor Legends · Tribute Series Wayne Spring W6IRD · 1949–2025 Silent Key The west coast’s master of the Collins KWM-380 and HF-380, a Southern California DX Club president, and one half of ham radio’s most devoted husband-and-wife restoration team. Wayne…