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A comment on DIY Spectrum Analyzer 0 to 1750MHz (1999). Parent comment

Re:DIY Spectrum Analyzer 0 to 1750MHz (1999) by pjc50 on Wednesday January 02, 2019 @12:04PM (#18807703)
I'm fairly sure that's technical pen on paper which has been scanned, run through a quantize filter to clean it up, and shrunk.
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Re:DIY Spectrum Analyzer 0 to 1750MHz (1999) by bArray on Wednesday January 02, 2019 @12:07PM (#18807737)
For sure, although not completely impossible to replicate in software.
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