CVARS WA7UHD

CVARS
The Chehalis Valley
Amateur Radio Society
WA7UHD

ARRL special service club




Electronics Workshop - March 28, 2019

Time & Location:

Topics:
  1. MicroHams Digital Conference
  2. A Digital Volt-Ohm-Meter Interface to Radio Shack Pro-2004 Scanner to Measure Deviation
  3. Seen on the Internet
  4. Stepper Motors

Notes:
  1. This year's MicroHams Conference presentations:
    • "RAMROD and Ham Radio"
    • "DRAWS - Digital Radio Amateur Work Station"
    • "Mobile Communications for the 21st Century"
    • "RMS Portable Operation"
    • "PNW DMR cBridge and Systems"
    • "GNU Radio"
    • "HamWAN Update"
  2. The wideband AC to DC peak reading converter was found in "Electronics Teach-in 9" from the publishers of "Everyday Practical Electronics"
  3. The AFE7422 is a dual-channel, wideband, RF-sampling analog front end (AFE) based on 14-bit, 9-GSPS DACs and 14-bit, 3-GSPS ADCs. With operation at an RF of up to 6 GHz, this device enables direct RF sampling into the C-band frequency range without the need for additional frequency conversions stages. This improvement in density and flexibility enables high-channel-count, multimission systems.
  4. Woodsmith, April/May 2019 has an article about a homebuilt CNC
  5. Nuts & Volts, January/February 2019 has an article about building an Arduino controlled, 1/2-watt, blue laser pencil etcher
  6. Mike Payne presented "Stepper Motor Basics" with notes

Reference:
  1. www.microhams.com/mhdc/ has links to presentation videos and slides (when available) for the yearly conference since 2007
  2. www.arrow.com/en/research-and-events/articles/fundamentals-of-op-amp-circuits discusses the "Top 10 Fundamental Operational Amplifiers Circuits"
  3. www.ti.com/product/AFE7422 has a description of the AFE7422 dual-channel RF-samplinganalog front end and links to a data sheet and additional information. Current pricing is $1,249.50 each in 100 unit lots!
  4. www.buildyourcnc.com has CNC router and laser units, kits and information

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