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Presentation by Shirly Dulcey, KE1L The FCC has requirements for the spectral purity of ham radio transmitters that include requirements for harmonic and spurious radiation. There are additional things like in-band spurs and broadband noise that are not covered by FCC regulations, but best amateur practice calls for minimizing them. You can now test your transmitters for these issues without a lab full of expensive gear. This presentation shows to perform tests using the tinySA, one of a number of inexpensive software defined receivers, and no-cost software. TinySA Resources: Amazon Affiliate Link: https://amzn.to/3hktbQ5 TinySA Wiki: https://www.tinysa.org/wiki/ This presentation was made at the QSO Today Virtual Ham Expo. For more information go to: https://qsotodayhamexpo.com Also visit the QSO Today Podcast for 1 hour interviews of ham radio operators who make these presentations: https://www.qsotoday.com