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Dr. Gregory L. Charvat
  • About
  • Radar
    • X-Band UWB FMCW Radar
    • Range-Gated S-Band UWB FMCW
    • Range-Gated X-Band FMCW
    • MIT Coffee Can Radar
    • X-Band USB Impulse Radar
    • L-Band UWB Short-Pulse Radar
    • Police Doppler Radar
    • X-Band DC Coupled CW Doppler Radar
    • Unique Approach to FMCW
    • Harmonic Radar
    • WXR-150 sidecar
  • Imaging
    • Synthetic Aperture Radar (SAR)
      • X-band UWB FMCW Rail SAR
      • Range-Gated S-Band Rail SAR
      • Range-Gated X-Band Rail Sar
      • X-Band UWB Impulse Rail Sar
      • Low-Power Radar Imaging System
    • SAR Data
    • Phased Array Radar
      • Through-Wall Radar
      • S-Band MIMO Array
      • IAP MIMO Phased Array
    • Time of Flight Microwave Camera
    • Medical Imaging - MRI
    • Medical Imaging - CMUT Ultrasound
  • Book - Small & Short-Range Radar Systems
  • Courses
  • Radio & Radio Science
    • Radio Science
      • 1.42 GHz Radio Telescope
      • HF Radar
      • Curing Thermoset Polymers
      • Lossy Dielectric Model
    • Amateur Radio
      • 20M SSB transceiver
      • 10&6M SSB transceiver
      • power distribution panel
      • Transceiving with the R390A
      • Portable amateur radio station
      • Mil Surplus & Vinitage Amateur Radio
        • S-76
  • Vacuum Tubes
    • Vacuum Tube Audio
      • Frankenstein
      • Quad-40
      • Mono-Block
      • Battery Powered Tube Pre-Amp
    • Antique Radio
      • Radiola18
      • Colin B. Kennedy 20B
      • Silvertone 4686
      • Olympic 606
      • Zenith K725
      • Emerson Model 888 Transistor
  • Vintage Test Equipment
  • Horology
    • Digital
      • Time Machine
    • Clocks
    • Watchhes
  • Vintage Computational Devices
    • NCR Class 1500 Cash Register
  • As-Seen on TV
  • Origin Story
Dr. Gregory L. Charvat
  • About
  • Radar
    • X-Band UWB FMCW Radar
    • Range-Gated S-Band UWB FMCW
    • Range-Gated X-Band FMCW
    • MIT Coffee Can Radar
    • X-Band USB Impulse Radar
    • L-Band UWB Short-Pulse Radar
    • Police Doppler Radar
    • X-Band DC Coupled CW Doppler Radar
    • Unique Approach to FMCW
    • Harmonic Radar
    • WXR-150 sidecar
  • Imaging
    • Synthetic Aperture Radar (SAR)
      • X-band UWB FMCW Rail SAR
      • Range-Gated S-Band Rail SAR
      • Range-Gated X-Band Rail Sar
      • X-Band UWB Impulse Rail Sar
      • Low-Power Radar Imaging System
    • SAR Data
    • Phased Array Radar
      • Through-Wall Radar
      • S-Band MIMO Array
      • IAP MIMO Phased Array
    • Time of Flight Microwave Camera
    • Medical Imaging - MRI
    • Medical Imaging - CMUT Ultrasound
  • Book - Small & Short-Range Radar Systems
  • Courses
  • Radio & Radio Science
    • Radio Science
      • 1.42 GHz Radio Telescope
      • HF Radar
      • Curing Thermoset Polymers
      • Lossy Dielectric Model
    • Amateur Radio
      • 20M SSB transceiver
      • 10&6M SSB transceiver
      • power distribution panel
      • Transceiving with the R390A
      • Portable amateur radio station
      • Mil Surplus & Vinitage Amateur Radio
        • S-76
  • Vacuum Tubes
    • Vacuum Tube Audio
      • Frankenstein
      • Quad-40
      • Mono-Block
      • Battery Powered Tube Pre-Amp
    • Antique Radio
      • Radiola18
      • Colin B. Kennedy 20B
      • Silvertone 4686
      • Olympic 606
      • Zenith K725
      • Emerson Model 888 Transistor
  • Vintage Test Equipment
  • Horology
    • Digital
      • Time Machine
    • Clocks
    • Watchhes
  • Vintage Computational Devices
    • NCR Class 1500 Cash Register
  • As-Seen on TV
  • Origin Story
  • More
    • About
    • Radar
      • X-Band UWB FMCW Radar
      • Range-Gated S-Band UWB FMCW
      • Range-Gated X-Band FMCW
      • MIT Coffee Can Radar
      • X-Band USB Impulse Radar
      • L-Band UWB Short-Pulse Radar
      • Police Doppler Radar
      • X-Band DC Coupled CW Doppler Radar
      • Unique Approach to FMCW
      • Harmonic Radar
      • WXR-150 sidecar
    • Imaging
      • Synthetic Aperture Radar (SAR)
        • X-band UWB FMCW Rail SAR
        • Range-Gated S-Band Rail SAR
        • Range-Gated X-Band Rail Sar
        • X-Band UWB Impulse Rail Sar
        • Low-Power Radar Imaging System
      • SAR Data
      • Phased Array Radar
        • Through-Wall Radar
        • S-Band MIMO Array
        • IAP MIMO Phased Array
      • Time of Flight Microwave Camera
      • Medical Imaging - MRI
      • Medical Imaging - CMUT Ultrasound
    • Book - Small & Short-Range Radar Systems
    • Courses
    • Radio & Radio Science
      • Radio Science
        • 1.42 GHz Radio Telescope
        • HF Radar
        • Curing Thermoset Polymers
        • Lossy Dielectric Model
      • Amateur Radio
        • 20M SSB transceiver
        • 10&6M SSB transceiver
        • power distribution panel
        • Transceiving with the R390A
        • Portable amateur radio station
        • Mil Surplus & Vinitage Amateur Radio
          • S-76
    • Vacuum Tubes
      • Vacuum Tube Audio
        • Frankenstein
        • Quad-40
        • Mono-Block
        • Battery Powered Tube Pre-Amp
      • Antique Radio
        • Radiola18
        • Colin B. Kennedy 20B
        • Silvertone 4686
        • Olympic 606
        • Zenith K725
        • Emerson Model 888 Transistor
    • Vintage Test Equipment
    • Horology
      • Digital
        • Time Machine
      • Clocks
      • Watchhes
    • Vintage Computational Devices
      • NCR Class 1500 Cash Register
    • As-Seen on TV
    • Origin Story

Digital

Publications

'Collecting, Repairing, And Wearing Vintage Digital Watches.' Hackaday, November 28, 2018.

Time Machine

"Old Projects? Memorialize Them Into Functional Art," Donald Papp, Hackaday, Sept. 1, 2025.

Western Union Self-Winding Clock + 21st Century GPS Synchronization = 100 year old atomic clock

100 Year Old Atomic Clock, Hackaday, September 25, 2019.

GPS Clock

Used for synchronizing the 100 year old atomioc clock (see above)

Heathkit GC-1000 most accurate clock demo

Repair & Collect Vintage Digital Watches

"Collecting, Repairing, And Wearing Vintage Digital Watches," Hackaday Nov. 28, 2018.

Simple approach to polishing vintage digital watches

Disclaimer:  Information presented on this website is for reference only.  There are high voltages present in many of these designs that can be fatal.  With some designs shown there is a danger of RF burn that is capable of causing harm to you and others.  Do not attempt to build any of these projects unless you have the proper training and experience.
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