Aerospace & military / “high-reliability” electronics

• Rocketdyne mystery boards: Analysis & Photos
  Most likely from a rocket engine controller
  
• Hughes Space RF-generator box: Analysis & Photos
  Looks like an FM Tx exciter for a microwave link, somewhere in the 20-40 Ghz ballpark
  
• Space Micro digital microwave transmitter for a satellite: Analysis & Photos
  
• Digital processing boards from aircraft radar (Westinghouse)
  • One from the 70’s: Analysis & Photos
    
  • One from the 90’s: Analysis & Photos
    
• Broad Reach spacecraft I/O board: Analysis & Photos
• Hughes Space TWT HV power supply: Analysis & Photos
  
• Vibro-Meter Central Maintenance Computer: Analysis & Photos
• Honeywell RZ-220 Roll Rate Monitor: Analysis & Photos
  Includes interesting analog computing
• Bonzer Mini-Mark Radar Altimeter: Analysis & Photos
  Includes interesting multi-Ghz RF section from the 70’s
• Voice encryption/decryption unit from British helicopter: Analysis & Photos
• Mystery signal conditioner card from navigation system: Analysis & Photos
  
• Fire Control Computer from M1 tank: Analysis & Photos
• Litton mystery military boards: Analysis 1, Analysis 2, Analysis 3 & Photos
  
• Teledyne Control & Display Unit from military aircraft: Analysis & Photos
• Northrop AN/ASN-112 Navigation Computer control & display from military aircraft: Analysis & Photos
  Includes impressive hand-wiring
• McDonnell Douglas A05A0241-1 Voice Warning Generator from military aircraft: Analysis & Photos
  Includes shiny gold hybrids
  
• Honeywell NZ-920 Navigation Computer from a small jet: Analysis & Photos
  Less circuit analysis, but looks very nice
  
• SINCGARS military radio RF boards: Analysis & Photos
  PLLs as far as the eye can see
• Raytheon old military radio UHF receiver for frequency-hopping: Analysis & Photos
  Includes a frequency synthesizer built from generic digital logic
• Cubic Defense mystery RF boards & hybrids: Analysis 1, Analysis 2 & Photos
• L3 Communications mystery RF boards & VCO hybrids: Analysis & Photos
  
• Old aerospace/military computer boards with individual logic gates
  • Univac CP-901 early military aircraft computer: Analysis
  • Univac AN/UYK-7 standard Navy computer: Analysis
  • Marconi-Elliott aircraft navigation computer: Analysis
• Interpoint aerospace DC-DC converter: Analysis
  
• Smiths Aerospace Remote Interface Unit: Analysis & Photos
  More modern than most of these, from 2004
• Raytheon AN/USC-38 Submarine Satellite-Communications-Terminal boards: Analysis & Photos
• Mystery IBM Federal Systems Division computer peripheral cards: Analysis
  Gold hybrid modules & circuit-tracing (have extras for sale at-cost)
• Mystery Martin-Marietta digital board: Analysis
  Probably from a digital telemetry system as part of a military-aircraft “tactical data display”
• RF frequency multiplier from AN/APQ-120 radar: Analysis & Photos
  60’s microwave components in an X-band fighter jet fire control radar
• Interstate Electronics Corp. mystery CPU board: Analysis & Photos
• Merrimac PSD-4-30.7/27741 RF Phase Shifter: Analysis & Photos
  Includes sketchy construction methods & questionable reliability
• Elliott Air Nautical miles Indicator from Nimrod military aircraft: Photos
  I didn’t do any analysis on this one because Le Labo De Michel has already done an excellent job of reverse-engineering the circuitry here: https://youtu.be/iOEhtORQKAQ
• Honeywell/Sperry DS-125A TAS/Temperature Indicator: Analysis & Photos
• Raytheon Cabin Distribution Bus parts: Analog Interface Unit & Repeater: Analysis, Photos 1 and Photos 2
• Diehl Fire Extinguisher Control Unit: Analysis & Photos
• BAE Systems Audio Signal Discriminator: Analysis & Photos
  Includes incomprehensible diode logic
• Electronique Aerospatiale (EAS) Windshield Temperature Regulator: Photos
• Lockheed-Martin mystery digital logic board: Photos
  Haven’t yet figured out what this does, or what system it’s from, or even what all the ICs are (a couple remain with un-searchable part numbers)

De-capped hybrid modules & ICs

• Analog Devices HTS-0010 track & hold amplifier

RF & Microwave: Telecom & High-End Test Equipment

• Various Mini-Circuits module internals: Analysis & Photos
• Remec ED-0421-0 15 Ghz transmitter from wireless broadband system: Analysis & Photos
• Remec 18 Ghz receiver from wireless broadband system: Analysis & Photos
• L3/”Telemetry-East” 2.2-2.3 Ghz frequency synthesizer: Analysis & Photos
  May be from some kind of aerospace application
• Various telecom modules: Photos
  Featuring microwave circuitry & optical/opto-electronic modules
• Frequency Divider board from frequency synthesizer of Collins 651S-1 radio: Photos
  • Featuring a variety of 60’s/70’s flatpacks
• ENI 5100L 100W RF power amp: linear, broadband: Photos
• Amplifier Research AR200L 200W RF power amp: linear, broadband: Photos
  Featuring a lot of paralleled vacuum tubes

Test Equipment

• Velonex 345 high-voltage pulse generator: Analysis & Photos
• HP 8508A 1 Ghz vector voltmeter: Analysis & Photos
• Trek 609C-6 high-voltage amplifier: Analysis & Photos
• Bruker NMS120 benchtop NMR analyzer/relaxometer: Analysis & Photos
• Stanford Research Systems CG635 2 Ghz synthesized clock generator: Analysis & Photos
• Rohde & Schwarz FSL 3 Ghz spectrum analyzer: Analysis & Photos
• Rohde & Schwarz CMW 270 WiMax tester: RF front-end module: Analysis & Photos
• Teradyne microwave downconverter/demodulator from some kind of automated test equipment: Analysis & Photos
  • Opened RF hybrid modules from this board: Analysis
• GW Instek GPT-9603 high-voltage HiPot tester: Analysis & Photos
• NF 4005 & 4020 high-speed power amplifiers: Analysis & Photos 1, Photos 2
• Elgar 3000B AC line conditioner: Analysis & Photos
• HP 3314A function generator: Analysis & Photos
• AC Sources
  • Chroma 6408: Analysis & Photos
  • Chroma 65101: Analysis & Photos
  • Kikisui PCR500M: Analysis & Photos
• Array Solutions VNA 2180 (impressively-minimal RF VNA): Analysis & Photos
• Keysight N6701 modular power supply: Photos