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Reader Question · from Rich, WA6KNW Driving a Collins KWM-2A or 75S-3B with an Electronic Specialty Products DDS VFO Q: “Does anyone have the manual for hooking up the Electronic Specialty Products DDS VFO (the N3ZI DDS-based unit) to a Collins radio — KWM-2A or 75S-3B?” — Rich, WA6KNW Good question, Rich — and a… Read more: Driving a Collins KWM-2A or 75S-3B with an Electronic Specialty Products DDS VFO

KWM-2A Clinic: When the Preselector Peak and Grid Drive Peak Don’t Agree A good question landed on the reflector recently from Lenny, WB6QAZ, who is bringing a round-emblem KWM-2A back to life. The radio is working well on both receive and transmit, but two things had him puzzled — and they’re both things nearly every… Read more: KWM-2A Clinic: When the Preselector Peak and Grid Drive Peak Don’t Agree

Yaesu FT-101E — Parts Substitution & Sourcing Reference Common failure points, modern equivalents and procurement notes for the FT-101E hybrid transceiver (12BY7A driver + 2×6JS6C finals; otherwise solid-state, dual conversion: 5 MHz 1st IF, 9 MHz VFO, 3.18 MHz 2nd IF). 20 Tracked Parts 7 Critical / Safety Items 14 Part Categories 12 Procurement Sources Parts Substitution Table Designators follow… Read more: Yaesu FT-101E — Parts Substitution & Sourcing Reference

VK6ADA Technical Reference  ·  Boatanchor Files The Collins R‑389, R‑390 & R‑390A Development, deployment, and a practical operator’s guide to the finest HF receivers of the vacuum-tube era — written for amateur radio operators and shortwave listeners, fact-checked against the primary engineering record. For seventy years the Collins R‑390A has worn the unofficial title of… Read more: The Collins R-389, R-390 and R-390A

Boatanchor Legends — A Tribute Series Carol Maher, W4CLM The keeper of the Fox Tango flame — who took a dormant newsletter club and built it into the definitive online home for Yaesu owners the world over. Some legends of the boatanchor world are remembered for a single rig they perfected, a circuit they pioneered,… Read more: Carol Maher – W4CLM

Boatanchor Legends — A Tribute Series Milton Lowens, WA2AOQ · N4ML The retired engineer who answered one radio’s design flaw by founding the most influential users group in amateur radio history — and proved that one man, one typewriter, and one good question can change an entire product line. Every great institution begins with a… Read more: Milton Lowens, WA2AOQ · N4ML

Boatanchor Legends · Tribute No. 47 Silent Key Glen E. Zook, K9STH First Article at Seventeen, and Six Decades Without Stopping Silent Key 22 July 2020, Richardson, Texas First Licensed as a teenager, K9 district (Indiana) Business Z-Communications Company Website k9sth.net (preserved) Glen Zook wrote his first article for 73 Magazine in 1961, at the… Read more: Glen Zook – K9STH

Boatanchor Legends · Tribute No. 46 Silent Key Dennis L. Brothers, WAØCBK From the Cedar Rapids Factory Floor to America’s Only Certified Collins Repair Center Born 9 February 1943, Kimball, Nebraska Silent Key 16 November 2024, age 81 Business Western Nebraska Electronics, Potter, NE Career ~50 years in electronics There is only one person in… Read more: Dennis L. Brothers, WAØCBK

Boatanchor Legends · Tribute No. 45 President · Collins Collectors Association Bill Carns, N7OTQ / KØCXX Art Collins’ Callsign Trustee, Editor of the Signal, Keeper of the Wimberley Shack Education BSEE 1964, MS Plasma Physics 1965, U. of Illinois First CCA Net Check-in 30 December 1990 CCA Founding Member AC94-0009 Home QTH Wimberley, Texas If… Read more: Bill Carns, N7OTQ / K0CXX

Boatanchor Legends · Tribute No. 44 Co-Founder · Collins Collectors Association Jay Roman, KBØATQ The Third Founder, and the Voice that Put the CCA Into Print First CCA Net Check-in 30 December 1990 CCM Founding Publisher June 1991 Original Board of Advisors August 1992 An on-air community can run for years and leave behind almost… Read more: Jay Roman, KBØATQ

Boatanchor Legends · Tribute No. 43 Silent Key Bud Whitney, K7RMT “K7 Rocky Mountain Time” — The Bench That Kept the Collins Fleet Alive Born 24 October 1919 Silent Key circa 2010–2012 Callsign Meaning K7 Rocky Mountain Time Workshop Wimberley, Texas By the time Bill Wheeler keyed the first Collins User Net on 14.263 MHz… Read more: Bud Whitney, K7RMT

Boatanchor Legends · Tribute No. 42 Active · Collins Engineer Rod Blocksome, KØDAS Collins Engineer, Historian, and the Man Who Brought a KWM-3 to Dayton First Licensed 1960 as KNØDAS Education BSEE 1968, MSEE 1973, Kansas State Career 42 years, Collins Radio / Rockwell Collins Home QTH Robins, Iowa Prior DX Calls VK2IHY, T30CXX, T32DAS… Read more: Rod Blocksome, KØDAS

Boatanchor Legends · Tribute No. 41 Silent Key Warren B. Bruene, W5OLY The Quiet Engineer Who Made Single Sideband Practical Born 1916, Iowa Silent Key 28 September 2013 Earlier Call WØTTK Home QTH Richardson, Texas If you have ever spoken into a Collins KWS-1, listened on a 75A-4, run a 30L-1 or 30S-1 amplifier, watched… Read more: Warren B. Bruene, W5OLY

Boatanchor Legends · Tribute No. 40 Silent Key Bill Wheeler, KØDEW The Quiet Founder of the Collins Collectors Association Born 18 July 1939 Silent Key 17 April 2020 First Licensed 1956 as KNØDEW Home QTH Lebanon, Missouri On a Sunday afternoon in February 1989, a Missouri ham with a fondness for Collins gear keyed up… Read more: Bill Wheeler K0DEW

ARRL Year of the Club · 2026 Club QSO Party The operating event designed FOR clubs, BY clubs The ARRL has officially declared 2026 the Year of the Club, and a brand-new on-the-air event has been launched specifically to energise members and put clubs front and centre. Other than Field Day, there are very few… Read more: Club QSO Party – 2026

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. Front panel of the Collins KWM-2A — photograph from the original CCAE article by Georges F6CER. Most of the KWM‑2 transceivers that turn up… Read more: Some KWM-2 / 2A Tricks by Georges Ricaud – F6CER

GPS-disciplined crystal channels for the Hammarlund SP-600-JX Bringing parts-per-billion frequency stability to a 1950s spy-radio classic using a $18 programmable crystal module and a GPS receiver The Hammarlund SP-600-JX is one of the great communications receivers of the vacuum-tube era — a precision general-coverage set built to military specifications, covering 540 kHz to 54 MHz, with a… Read more: GPS-disciplined crystal channels for the Hammarlund SP-600-JX

Capacitor Selection for Vintage Receiver, Transmitter, and Transceiver Restoration A practical reference for choosing replacement capacitors 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 like the KWM-2A and Heathkit SB-101, plus linear amplifiers and specialty equipment. If resistors are the… Read more: Capacitor Selection for Vintage Receiver, Transmitter, and Transceiver Restoration

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 like the KWM-2A and Heathkit SB-101, plus linear amplifiers and specialty equipment. When restoring 60-to-70-year-old… Read more: Low-Noise Resistor Selection for Vintage Radio Restoration

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, the Boatanchor SDR Integration Series has worked through what it takes to pair modern software-defined… Read more: The Boatanchor SDR Integration Series: Index and IF Buffer Amplifier Reference

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 Station. Read the S-Line article for the four-SDR-roles framework (panadapter, TX monitor, off-air monitor, digital… Read more: Choosing an SDR for the Collins KWM-2A Transceiver

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, and Collins 51S-1 all concerned receive-only integration. The S-Line is different: pairing a 75S-1 with… Read more: Choosing an SDR for the Collins S-Line Station: 75S-1 Receiver and 32S-1 Transmitter

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 follows Choosing an SDR Front-End for the R-390A and Choosing an SDR Front-End for the… Read more: Choosing an SDR Front-End for the Collins 51S-1: Factory Outputs, Foresight, and Mechanical Filters

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 on the forum owns. Companion article: This piece parallels the earlier Choosing an SDR Front-End… Read more: Choosing an SDR Front-End for the Hammarlund SP-600: Variants, Architectures, and Companions

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 produced, and seventy years on it remains a reference instrument. Its single-conversion-above-1-MHz architecture, crystal-calibrated PTO,… Read more: Choosing an SDR Front-End for the R-390A: A Comparison Matrix

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. A structured 30-point suppression programme drawn from the Collins service bulletin record and modern EMI… Read more: Collins HF-380 Transceiver – RFI Analysis & Mitigation Engineering Guide

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 the HF-380 from its amateur sibling. Companion document to the KWM-380 Tantalum Capacitor Replacement Reference… Read more: Collins HF-380 Transceiver — Tantalum Capacitor Replacement Reference Guide

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 Spring was one of those rare amateurs whose licensed career bridged the entire modern history… Read more: Wayne Spring – W6IRD

Spectrum Pollution · Advocacy Brief · April 2026 Starlink and the Silent Assault on the Low-Frequency Radio Spectrum How Unintended Electromagnetic Radiation from LEO Mega-Constellations Threatens Radio Astronomy, Weak-Signal Work, and the DX-er’s Night Sky — and What Amateur Radio Operators Can Do About It By Mike Peace VK6ADA — r-390a.net Administrator Executive Summary As… Read more: Starlink and the Silent Assault on the Low-Frequency Radio Spectrum

KWM-380 Tantalum Capacitor Replacement Reference Board-by-Board Location Guide, Risk Assessment & Replacement Recommendations Mike Peace VK6ADA • r-390a.net • vk6ada.com.au • April 2026 This reference accompanies the Collins KWM-380 RFI Analysis & Mitigation Guide. A site visitor asked for a practical list of tantalum capacitors and their board locations to simplify the replacement process. This… Read more: KWM-380 Tantalum Capacitor Replacement Reference

COLLINS KWM-380 RFI Analysis & Mitigation Guide A Comprehensive Engineering Reference for Reducing Noise Floor and Improving HF Signal-to-Noise Ratios Mike Peace VK6ADA • r-390a.net • vk6ada.com.au • April 2026 • Rev 1.0 1. Introduction The Rockwell Collins KWM-380 (introduced ~1979–1982) is a fundamentally different machine from the tube-era S-Line and KWM-2 equipment. It is… Read more: Collins KWM-380 RFI Analysis

Avionics History — Cold War Electronic Warfare The AN/APR-9B and AN/APA-70C on the AF-2W Guardian: Passive Radar Homing in Cold War ASW How the Grumman Guardian’s hunter variant used AIL/Collins electronic countermeasures equipment to detect, bear on, and home toward Soviet radar transmissions — SAC document confirmation, the probable APR-9B/APA-70C interface architecture, and the Shrike/ADI… Read more: The AN/APR-9B and AN/APA-70C on the AF-2W Guardian: Passive Radar Homing in Cold War ASW

R-390A Restoration Series — Power Supply Solid-State Replacement for the R-390A 26Z5W Rectifier Tubes Eliminating a critical obsolescence bottleneck in the PP-621/URR power supply — with full attention to B+ voltage compensation, heater string integrity, RFI suppression, and long-term reliability. Mike Peace VK6ADA  |  r-390a.net Administrator  |  vk6ada.com.au Introduction The Collins R-390A/URR is a receiver… Read more: Solid-State Replacement for the R-390A 26Z5W Rectifier Tubes

Collins 516F-2 Power Supply Transformer T1 Wire Identification Guide When the insulation fails and the colours disappear — mapping every winding from the inside out. A practical restoration reference for the CCA community The Problem The Collins 516F-2 power supply has served the S-Line family — KWM-2/2A transceivers and 32S-series transmitters — since the early… Read more: Collins 516F-2 Power Supply

Boatanchor Legends: Bob Sternowski, WB0LBI — From the Collins Radio Bench to Venus Boatanchor Legends — A Tribute Series Robert “Bob” Sternowski WB0LBI — Silent Key Collins Radio • Softronics Ltd. • NASA • HF Engineering Pioneer Bob Sternowski spent thirty-four years inside Collins Radio and its successor Rockwell Collins, rising to Director of Engineering… Read more: Robert “Bob” Sternowski, WB0LBI

Avionics Reference — ARINC 410 / 566A Series, Part 3 The Complete Collins 618M Lineage From ARINC 410 Origins (618M-1) to ARINC 566A/429 (618M-5) · The 313N Series Map · Gables Panel Pairings Confirmed CORRECTIONS & ENRICHMENT FROM JAN SP5XZG  ·  COMPILED: VK6ADA, APRIL 2026 Editorial Note Jan SP5XZG wrote a third time with several… Read more: The Complete Collins 618M Lineage

VK6ADA — Boatanchor Technical Library Care and Feeding of Power Grid Tubes in Vintage Collins Radio Equipment A Modern Reference Guide in the Spirit of Eimac’s Classic Application Bulletin Prepared April 2026  ·  Fact-Checked & Enriched Edition  ·  Mike Peace VK6ADA Table of Contents Foreword Collins Lineup Overview The 811A Triode — 30L-1 The 4X150A… Read more: Care and Feeding of Power Grid Tubes in Vintage Collins Radio Equipment

Collins Collectors Association — Technical Bulletin Commentary CCA Technical Bulletin 1 Understanding and Mitigating S-Line Transmitter Spikes BULLETIN REF: CCA-TB-001  ·  APPLIES TO: 32S-1 · 32S-3 · 32S-3A · KWM-2/2A  ·  COMMENTARY: VK6ADA, April 2026 ⚠ Priority Action Required — All 32S-3 / 32S-3A Owners If you do not know the complete modification history of… Read more: Understanding and Mitigating S-Line Transmitter Spikes

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 mechanical filter complement, 500 kHz IF system, and the 30-band front end About the 51J-4… Read more: Collins 51J-4 Known Issues & Fault Diagnosis

Collins S-Line Station Grounding & Bonding RF Ground, Audio Ground & Chassis Ground Are Three Different Things Incorrect bonding between the 75S-3, 32S-3, 312B-4, 30L-1, and 516F-2 is behind a significant proportion of hum, buzz, and RFI complaints — this guide explains the three ground domains, the interconnect cable ground paths, and the systematic approach… Read more: Collins S-Line Station Grounding & Bonding

Collins 32S-3 & 32S-3A Known Issues Transmitter-Specific: Carrier Balance Drift, ALC Time Constant, PA Neutralisation Loss & More Community-documented problems, factory service bulletins, and proven fixes for the most common S-Line transmitter restoration issues — the transmitter companion to the 75S-3/3A Known Issues guide About This Document The Collins 32S-3 (1962–1968) and 32S-3A (1968–1978) are… Read more: Collins 32S-3 & 32S-3A Known Issues

Web-888 SDR Integration Series National HRO-60 + Web-888 SDR Integration First Published SDR Integration Guide for the Iconic National Boatanchor The HRO-60 has no factory IF output and no existing SDR integration documentation — this guide provides the complete procedure for adding a high-impedance IF tap at 455 kHz and connecting the Web-888 SDR for… Read more: National HRO-60 + Web-888 SDR Integration

Collins 75S-3 & 75S-3A Known Issues Community-Documented Problems, Factory Service Bulletins & Proven Fixes AGC anomalies, product detector noise, PTO drift, bandswitch oxidation, frozen trimmers, Black Beauty capacitors, and the service bulletins that address them — a consolidated reference for the most common S-Line receiver restoration issues About This Document The Collins 75S-3 (1962–1968) and… Read more: Collins 75S-3 & 75S-3A Known Issues

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 a buffered 50Ω 500 kHz IF signal via a built-in V111 cathode follower, ready for… Read more: Collins 51J-4 Receiver + Web-888 SDR Integration

Collins S-Line AGC System Explained Delayed AGC with Separate Threshold, Dual Time-Constant Network & S-Meter Drive Understanding the 75S-3B/3C AGC loop is essential for diagnosing sensitivity and overload complaints — the AGC threshold, attack/decay time constants, noise clipper, and S-Meter transfer function explained from first principles with the Don Jackson analysis as primary reference Why… Read more: Collins S-Line AGC System Explained

Collins 32S-3 PA Neutralisation — Step by Step The Procedure Most Likely to Be Skipped — And Most Consequential When Wrong Definitive guide to 6146 PA neutralisation in the 32S-3/3A, KWM-2/2A, and 32S-1 — covering both the ceramic trimmer and air-variable circuits, the 6146B compatibility issue, oscilloscope technique, and the driver shield problem that kills… Read more: Collins 32S-3 PA Neutralisation — Step by Step

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 step-by-step approach that actually works Why Carrier Balance Matters for Audio Quality Carrier balance is… Read more: Collins KWM-2/2A Carrier Balance Optimisation

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 legal limit What ALC Does — And Why It Matters Automatic Level Control (ALC) is… Read more: Collins S-Line ALC System — Theory, Faults & Wiring

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 generator and oscilloscope — covering impedance matching, the point-by-point sweep technique, and interpretation of results… Read more: Collins Mechanical Filter Testing

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 series, KWM-2/2A, and 312B-5 Why PTO Service is Essential The Collins 70K-2 Permeability Tuned Oscillator… Read more: Collins S-Line PTO Overhaul & Re-lubrication

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 from Rockwell Collins to reproduce and disseminate Collins copyrighted materials related to amateur radio products… Read more: Collins Collectors Association Technical Bulletins, Archives, and Community Resources — A Practical Guide

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 a full transceiver sharing oscillators, mechanical filter, and RF amplifier between transmit and receive paths… Read more: Collins KWM-2/2A Known Issues

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 the complete Rippel/Schartau/Solomon capacitor priority list and community-proven fixes for the most common 75A-4 faults… Read more: Collins 75A-4 Known Issues & Top Components to Replace

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 context for every IF selectivity filter used across the Collins receiver and transmitter family Introduction… Read more: Crystal Filters & Mechanical Filters — A-Line Receivers, KWS-1, R-388, R-390 & R-390A Collins – IF Selectivity Filter Master Reference

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, 32S-1, 32S-2, 32S-3, 32S-3A, KWM-2, and KWM-2A. Covers every Y-case and FA-case mechanical filter, every… Read more: Collins S-Line and KWM-2/KWM-2A Crystal and Mechanical Filter Comprehensive Reference

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 — formally titled “Mark 2 Standard Frequency Selection System” and first published 1 October 1961 — specified the… Read more: ARINC 410 Two-out-of-Five VHF Airborne COM Transceivers

vk6ada.com.au • Failure Prevention Kit Series • Watkins-Johnson WJ-8888 Watkins-Johnson WJ-8888Failure Prevention Kit — Synthesiser Integrity, Band-Switching Relays, Electrolytic Aging, and the Solid-State Failure Hierarchy The Watkins-Johnson WJ-8888 is a fully solid-state professional HF communications receiver built to a specification demanding enough that it found its way into government, military, and intelligence agency installations worldwide.… Read more: Watkins-Johnson WJ-8888 Failure Prevention Kit — Synthesiser Integrity, Band-Switching Relays, Electrolytic Aging, and the Solid-State Failure Hierarchy

vk6ada.com.au • SDR Integration Series • Hammarlund HQ-180 SWL & Amateur Monitor Web-888 with the Hammarlund HQ-180Intraband Panadapter and Complete Coverage Extension — A Two-Role Integration Unlike Any Other in This Series Every other vintage receiver in the vk6ada.com.au Web-888 series covers the full HF spectrum — the SP-600 from 540 kHz to 54 MHz, the R-388… Read more: Web-888 with the Hammarlund HQ-180 Intraband Panadapter and Complete Coverage Extension — A Two-Role Integration Unlike Any Other in This Series

vk6ada.com.au • SDR Integration Series • Collins R-388/URR SWL Station Web-888 with the Collins R-388/URRPTO Precision, SSB Capability, and Thirty-Band SWL Coverage — Architecture, Integration, and Eight Operating Procedures The Collins R-388/URR brings three capabilities to the Web-888 pairing that the Hammarlund SP-600 cannot match: a Collins PTO that eliminates preselector peaking entirely, a product… Read more: Web-888 with the Collins R-388/URR PTO Precision, SSB Capability, and Thirty-Band SWL Coverage — Architecture, Integration, and Eight Operating Procedures

vk6ada.com.au • SDR Integration Series • Hammarlund SP-600 SWL Station Web-888 with the Hammarlund SP-600The Simplest and Cleanest Web-888 Integration in the Series — A Complete SWL Station Guide The Hammarlund SP-600 is a receiver. It has no transmitter, no PA, no ALC feedback loop, no T/R relay, no high-voltage output at the antenna connector.… Read more: Web-888 with the Hammarlund SP-600 The Simplest and Cleanest Web-888 Integration in the Series — A Complete SWL Station Guide