Electronics Workshop - March 30, 2017
Time & Location:
- 7:00 PM
- Fire District 6 Training Room, 2123 Jackson Highway, Chehalis, WA
Topics:
- Signal/Function Generators
- FM Deviation
- Hands-On Oscilloscopes
Bring (if you have):
- Oscilloscope
- Audio Signal Generator or Function Generator
Notes:
- Periodic waveform: Frequency = 1/Period; 1 millisecond = 1,000 Hertz
- FM modulation index = frequency deviation / modulation frequency
at modulation index of 2.41, carrier magnitude is 0
- FM deviation ratio = max frequency deviation / max modulation frequency
Reference:
Arduino Signal Generator:
- An interesting review of several approaches to Arduino Digital to Analog Conversion:
http://embeddednewbie.blogspot.com/2011/02/review-of-arduino-dac-solutions.html
- An Arduino wiki with a large collection of information:
https://arduino-info.wikispaces.com/
- 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:
- This site has a free version which is what I used:
http://www.dr-jordan-design.de/signalgen.htm
FM Deviation:
- YouTube “How to Measure FM Deviation without special equipment
using Carrier/Bessel Null”:
https://www.youtube.com/watch?v=8IBOYoIV5m8&t=2s
- YouTube “How to measure FM frequency deviation with a spectrum analyzer”:
https://www.youtube.com/watch?v=Nw3_w1HrlEs&t=2s
- 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
- Finding the discriminator output for a number of scanners:
http://www.repeater-builder.com/uniden/mr8100/discrim.txt
