Hammarlund SP-600 Restoration Guide | VK6ADA VK6ADA vk6ada.com.au • r-390a.net Boatanchor Receiver Restoration Series Hammarlund SP-600Restoration Guide A complete field guide to the cosmetic and mechanical restoration of the Hammarlund SP-600 series military HF communications receiver — covering variant identification,…
R-388/URR Restoration Guide | VK6ADA VK6ADA vk6ada.com.au • r-390a.net Collins Military Receiver Restoration Series R-388/URR ReceiverRestoration Guide A complete field guide to the cosmetic and mechanical restoration of the Collins R-388/URR military HF communications receiver — covering disassembly, paint stripping,…
Collins S-Line Cabinet & Trim Restoration Guide | VK6ADA VK6ADA vk6ada.com.au • r-390a.net Collins S-Line Restoration Series Cabinet, Bezel & Trim Restorationfor the Collins S-Line A complete field guide to restoring Collins S-Line cabinets, front-panel bezels, and all associated trim…
If you own or are restoring a Hammarlund SP-600, one resource you need to know about is Perry Sandeen’s An Anthology of Technical References for the Hammarlund SP-600 and its Variants. This is a comprehensive compilation covering the SP-600 receiver family…
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…
VK6ADA · Mike Peace · Vintage Collins Radio · r-390a.net Home › Collins Vintage Radio › Collins KWM-1 / KWM-1A Serial Number Guide Collins KWM-1 / KWM-1A — Serial Number & Production Guide VK6ADA Technical Reference · Collins Vintage Amateur…
Collins 75S-3 / 75S-3B / 75S-3C Receiver Serial Number Guide – VK6ADA VK6ADA · Mike Peace · Vintage Collins Radio · r-390a.net Home › Collins S-Line › Collins 75S-3 / 75S-3B / 75S-3C Serial Number Guide Collins 75S-3 / 75S-3B…
Collins 75S-2 Receiver Serial Number Guide – VK6ADA VK6ADA · Mike Peace · Vintage Collins Radio · r-390a.net Home › Collins S-Line › Collins 75S-2 (RARE) › Serial Number Guide Collins 75S-2 — Serial Number & Production Guide VK6ADA Technical…
Collins 75S-1 Receiver Serial Number Guide – VK6ADA VK6ADA · Mike Peace · Vintage Collins Radio · r-390a.net Home › Collins S-Line › Collins 75S-1 Serial Number Guide Collins 75S-1 — Serial Number & Production Guide VK6ADA Technical Reference · …
Collins 32S-3 Transmitter Serial Number Guide – VK6ADA VK6ADA · Mike Peace · Vintage Collins Radio · r-390a.net Home › Collins S-Line › Collins 32S-3 Serial Number Guide Collins 32S-3 — Serial Number & Production Guide VK6ADA Technical Reference · …
Collins 32S-2 Transmitter Serial Number Guide – VK6ADA VK6ADA · Mike Peace · Vintage Collins Radio · r-390a.net Home › Collins S-Line › Collins 32S-2 Serial Number Guide Collins 32S-2 — Serial Number & Production Guide VK6ADA Technical Reference · …
Collins 32S-1 Transmitter Serial Number Guide – VK6ADA VK6ADA · Mike Peace · Vintage Collins Radio · r-390a.net Home › Collins S-Line › Collins 32S-1 Serial Number Guide Collins 32S-1 — Serial Number & Production Guide VK6ADA Technical Reference · …
◆ VK6ADA · r-390a.net · Topic Index Hollow State NewsletterComplete Topic Index The Community Archive — Unlocked & Indexed Editor: Les Locklear • Gulfport, Mississippi • ~1993–2001 53Issues 7Yrs Run 30+Contributors 18Topic Cats The Hollow State Newsletter (HSN) was the…
SDR Resource Guide · vk6ada.com.au OpenWebRX+ · Primary Websites & Resources Web-based Software Defined Radio — The Enhanced Fork OpenWebRX+ is an enhanced community fork of the original OpenWebRX web-based software-defined radio application. It extends the upstream project with additional…
Bill Orr W6SAI — Amateur Radio Legend | VK6ADA VK6ADA · Boatanchor Legends Series Bill Orr W6SAI Engineer · Educator · Author · Amateur Radio Legend 1919 – 2001 | W2HCE / W6SAI | DXCC Honor Roll | OSCAR-1 Pioneer…
Collins 30L-1 Serial Number Guide – VK6ADA VK6ADA Mike Peace · Vintage Collins Radio · r-390a.net Home › Collins 30L-1 Amplifier › Serial Number Guide Collins 30L-1 — Serial Number & Production Guide VK6ADA Technical Reference · Collins S-Line Vintage…
Collins 51S-1 / 1A / 1F / 1AF / 1B — AM, CW & SSB Receiver A comprehensive engineering analysis of RFI mitigation strategies, ferrite core selection, noise reduction techniques, and signal-to-noise ratio improvements for the Collins 51S-1 series receivers.…
Technical Whitepaper · VK6ADA · r-390a.net Rebuilding & Upgrading the Collins S-Line70K-2 Permeability-Tuned Oscillator (PTO) Modern Component Substitution · RFI Mitigation · Ferrite Core Techniques · Signal-to-Noise Improvement 75S-1 75S-2 75S-3 75S-3B 75S-3C/m 32S-1 32S-2 32S-3 KWM-2 KWM-2A AUTHOR Mike…
Enhancing the Collins 180S-1 Antenna Tuner: Complementary Balun Designs Products for Modern HF Operation Technical White Paper — Collins S-Line Restoration & Integration Series 📝 VK6ADA Technical Papers 📅 March 2026 🔌 HF Antenna Systems ⚡ 1 kW Class Abstract.…
Collins 75S-3 — BFO Sideband Tolerance Reduction: Design Options Engineering Design Study — Collins S-Line Series Collins 75S-3 ReceiverBFO Sideband Tolerance Reduction Design Options to Reduce USB / LSB Dial Offset — Component Changes, Circuit Modifications, and Modern Replacement Strategies…
Collins 75S-3 Receiver – Known Issue: USB/LSB BFO Dial Offset Known Issue — Collins S-Line Series Collins 75S-3 ReceiverUSB / LSB BFO Dial Offset Tunable BFO “Zero” Position Differs Between Sidebands — Normal Tolerance Behaviour vs. Alignment Fault Equipment: Collins…
Single-Band Loss: Symptom Analysis, Root Cause Diagnosis & Troubleshooting Collins Radio · Technical Reference Series Collins 32S-3 Transmitter Single-Band Loss: Symptom Analysis, Root Cause Diagnosis & Troubleshooting 80 METRES VFO INJECTION 1ST MIXER BAND SWITCH Reported Case Summary All three…
Antenna Engineering Guide · Collins S-Line · Balun Designs Multiband HF Loop Antennas with the Collins 180S-1 Tuner, Balun Designs Model 4114 and Model 1115d Impedance Transformation, Common-Mode Suppression & Practical Installation for 160–10 Metre Operation by Mike Peace VK6ADA…
Collins KWM-2A Transceiver RFI Mitigation & Receiver Noise Reduction Ferrite Cores, Inductors, Filtering & Grounding Modifications for the Modern Noise Environment Mike Peace VK6ADA • r-390a.net Administrator 1. Executive Summary The Collins KWM-2A is a double-conversion SSB/CW transceiver covering 3.4–30.0 MHz,…
Collins 312B-3 Speaker Cabinet Bluetooth Speaker Conversion Dual-Mode DC / Li-Ion Battery Power · Bluetooth 5.0 aptX HD · Dayton Audio KAB-250v4 + LBB-5Sv2 · Ferrite RFI Suppression Mike Peace VK6ADA · r-390a.net Administrator · March 2026 1. Project Overview…
Collins 516F-2 Speaker Cabinet Bluetooth Speaker Conversion Dual-Mode AC / Li-Ion Battery Power · Bluetooth 5.0 aptX HD · Dayton Audio KAB-250v4 + LBB-5Sv2 · Ferrite RFI Suppression Mike Peace VK6ADA · r-390a.net Administrator · March 2026 1. Project Overview…
Collins MP-1 Power SupplyComplete Restoration Kit For the S-Line · KWM-2 · KWM-2A | Includes RFI Mitigation Ferrite Package 47 Components 100% USA Sourcing Ships from Missouri 6Kit Sections 47Components 6US Vendors 4Ferrite Types The Collins MP-1 mobile power supply…
Collins 136B-2 Noise Blanker Engineering Changes & Circuit Modifications Reference Collins 136B-2 Noise Blanker Engineering Changes & Circuit Modification Reference Covering factory-issued changes, community-developed improvements, alignment notes, antenna adaptation, and advanced modifications for contemporary fixed-station use. 1. Background & Design…
Engineering Reference Document Collins 516F-2 Power Supply RFI Analysis & Mitigation Engineering Guide Noise Floor Reduction Strategies for Collins S-Line, KWM-2, and KWM-2A HF Station Installations Prepared by Mike Peace VK6ADA | r-390a.net Administrator | Document Revision 2.0 — February…
Vintage Hammarlund · Restoration Guide Hammarlund SP-600 JX-16 Complete Restoration, Alignment & RFI Mitigation Guide Mike Peace VK6ADA · r-390a.net Administrator Parameter Specification Frequency Coverage 0.54 – 54 MHz in 6 bands Conversion Double conversion (above 7 MHz); single below…
Mission RGO ONE · Technical Guide RGO ONE HF Transceiver RFI Mitigation, Receiver Noise Reduction & Signal-to-Noise Ratio Improvement Guide Mike Peace VK6ADA · r-390a.net Administrator Field Detail Author Mike Peace, VK6ADA Website vk6ada.com.au Resource r-390a.net Transceiver Mission RGO ONE…
Collins 32S-1 Transmitter
Boatanchor Legends — A Tribute Series Matt Parkinson is one of the credited contributors to “The 21st Century R-390A/URR Technical Reference” — the Y2K Manual — the document that transformed the R-390A from an equipment type served by scattered, aging…
HSN Founding Editor & R-390A Historian • Gulfport, Mississippi The Founding Editor Les Locklear of Gulfport, Mississippi is one of the foundational figures of the modern R-390A community. As the original editor of the Hollow State Newsletter, he shepherded the…
K1LKY — R-390 Restoration Authority & NIST Engineer The Professional Engineer Roy Morgan, K1LKY (of Western Massachusetts, formerly at the National Institute of Standards and Technology), brought professional-grade engineering discipline to the R-390 community. His restoration guidelines for the R-390…
AGC Engineer & Circuit Analyst Ending the Moment of Silence David Wise is one of the most technically rigorous contributors in the R-390A community’s history. His signature achievement is the landmark document “R-390/R-390A AGC — Ending The Moment Of Silence,”…
N5OFF — R-390A Production Historian & Document Preservationist The Historian Tom Marcotte, N5OFF, is one of the most important historical researchers in the R-390 community. For years, he has been diligently amassing production data — contract numbers, manufacturers, quantities, and…
W5OR — R-390 List Manager & R-389 VLF Receiver Authority The List Manager Don Reaves, W5OR, served as the manager of the R-390 mailing list — the primary online gathering place for the R-390 community for many years. In this…
The Collins R-390A is arguably the finest tube-era military HF receiver ever built — but it was designed in the early 1950s for AM and CW reception. As amateur and military communications transitioned to single-sideband (SSB), several aftermarket solutions emerged…
R-390A Aftermarket SSB Adapters: A Comparison Guide R-390A Aftermarket SSB Adapters: A Comparison Guide Mike Peace · March 9, 2026 · Amateur Radio, R-390A.NET The Collins R-390A is arguably the finest tube-era military HF receiver ever built — but it…
The Boatanchor Legends series honors the individuals who built, preserved, and shared the technical knowledge that keeps the R-390A and its sister receivers alive. From the editors of the Y2K Manual to the archivists who saved disappearing documentation, from the…
Boatanchor Legends: Barry Hauser — Y2K Manual Co-Editor & Community Voice Boatanchor Legends — A Tribute Series Barry Hauser New York Y2K Manual Co-Editor • Reflector Voice • Community Historian Barry Hauser brought two rare qualities to the R-390A community…
Boatanchor Legends: DW Holtman, WB7SSN — Y2K Manual Technical Illustrator Boatanchor Legends — A Tribute Series DW Holtman, WB7SSN Y2K Manual Contributor Technical Illustrator • Digital Draftsman DW Holtman brought a draftsman’s precision to the R-390A community’s most important document.…
Boatanchor Legends: Gary Gitzen — Y2K Manual Contributor Boatanchor Legends — A Tribute Series Gary Gitzen Y2K Manual Contributor Technical Knowledge • Community Expertise Gary Gitzen is one of the credited contributors to “The 21st Century R-390A/URR Technical Reference” —…
Boatanchor Legends: Tom Norris — Y2K Manual Contributor Boatanchor Legends — A Tribute Series Tom Norris Y2K Manual Contributor Technical Expertise • Community Knowledge Tom Norris is one of the credited contributors to “The 21st Century R-390A/URR Technical Reference” —…
Boatanchor Legends: Scott Seickel — Y2K Manual Contributor & Reflector Participant Boatanchor Legends — A Tribute Series Scott Seickel Y2K Manual Contributor R-390 Reflector Contributor • Technical Knowledge Sharer Scott Seickel holds a distinctive place in the R-390A community: he…
Wei-i Li The Archivist Every technical community generates far more knowledge than it manages to preserve. Conversations happen, problems are solved, solutions are shared — and then the thread scrolls off the page and the answer that took three experts…
Clemens Stubbe Østergaard The Scholar at the Receiver The R-390A community has always attracted serious people — engineers, technicians, former military operators, and dedicated amateurs who approach the receiver with the same rigour they bring to their professional lives. Clemens…
Dr. Gerald N. Johnson — KE0KI The Engineer in the Room Most online technical communities have enthusiasts, experienced hobbyists, and the occasional retired technician. Very few have a licensed Professional Engineer with a Ph.D. in electrical engineering who shows up…
Electric Radio Magazine — Barry Wiseman N6CSW & Ray Osterwald N0DMS The Publication That Gave the Community a Voice Every technical community needs somewhere to put its knowledge down in writing — somewhere permanent, indexed, and reproducible. For the R-390A…