CVARS WA7UHD

CVARS
The Chehalis Valley
Amateur Radio Society
WA7UHD

ARRL special service club





Electronics Workshop - March 30, 2017

Time & Location:

Topics:
  1. Signal/Function Generators
  2. FM Deviation
  3. Hands-On Oscilloscopes

Bring (if you have):
  1. Oscilloscope
  2. Audio Signal Generator or Function Generator

Notes:
  1. Periodic waveform: Frequency = 1/Period; 1 millisecond = 1,000 Hertz
  2. FM modulation index = frequency deviation / modulation frequency
    at modulation index of 2.41, carrier magnitude is 0
  3. FM deviation ratio = max frequency deviation / max modulation frequency

Reference:
Arduino Signal Generator:
  1. An interesting review of several approaches to Arduino Digital to Analog Conversion:
    http://embeddednewbie.blogspot.com/2011/02/review-of-arduino-dac-solutions.html
  2. An Arduino wiki with a large collection of information:
    https://arduino-info.wikispaces.com/
  3. A good study of ways to increase the maximum frequency of an Arduino function generator:
    http://tronixstuff.com/2011/10/22/tutorial-arduino-port-manipulation/
PC Signal Generator:
  1. This site has a free version which is what I used:
    http://www.dr-jordan-design.de/signalgen.htm
FM Deviation:
  1. YouTube “How to Measure FM Deviation without special equipment using Carrier/Bessel Null”:
    https://www.youtube.com/watch?v=8IBOYoIV5m8&t=2s
  2. YouTube “How to measure FM frequency deviation with a spectrum analyzer”:
    https://www.youtube.com/watch?v=Nw3_w1HrlEs&t=2s
  3. The importance of deviation for packet, and how to tap the discriminator output of a scanner:
    http://www.febo.com/packet/layer-one/transmit.html
  4. Finding the discriminator output for a number of scanners:
    http://www.repeater-builder.com/uniden/mr8100/discrim.txt

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