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  The Chehalis Valley
 Amateur Radio Society
A  501(c)(3) Non-profit 		          
 
 

Electronics Workshop - March 31, 2022

Time & Location:
Topics:
  1. LED Voltage Level Detector
  2. QRM Eliminator
  3. GPS
  4. Potpourri
Notes:
LED Voltage Level Detector:
  1. Uses diodes and LEDs:
    https://www.nutsvolts.com/magazine/article/just_for_starters_200409
  2. "Voltage Level Indicator Circuit using IC LM339":
    https://mechatrofice.com/circuits/voltage-level-indicator-circuit
QRM Eliminator:
  1. "Receiver Noise Canceller" overview article with a circuit schematic:
    https://www.qsl.net/va3iul/Receiver_Noise_Canceller/Receiver_Noise_Canceller.htm
    and an .flv format video showing the canceller in action:
    https://www.qsl.net/va3iul/Receiver_Noise_Canceller/Noise_Canceller_YO3DAC.flv
  2. "Does a Noise Canceller Really Work?"
    http://play.fallows.ca/wp/radio/radio-frequency-interference/does-a-noise-canceller-really-work/
  3. Commercial noise canceller comparison:
    https://play.fallows.ca/wp/radio/radio-frequency-interference/all-good-things-qrm-eliminator-wrap-up/#more-8106
  4. Noise canceller survey article:
    https://www.g8jnj.net/rfnoisecancellation.htm
  5. G8JNJ Noise Canceller survey article:
    https://www.g8jnj.net/rfnoisecancellation.htm
  6. Product web sites:
GPS:
  1. VisualGPSView:
    http://www.visualgps.net/#visualgpsview-content
  2. BktTimeSync:
    https://www.maniaradio.it/en/bkttimesync.html
Potpourri:

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