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Hi Everyone: I’ve been reviewing the Son of Sam thread with interest. I heard him last night on 3700—very clear. Being an engineer with some signal analysis experience, I was intrigued by what some have described as “hum” or “buzzing” at the beginning of the message. To my ear, the “hum” sounded more like a square wave, rather than the hum of a 60 Hz sine wave (as one might hear from a dirty novice transmission). So I piped the signal into Spectrogram (a great program) to view the waveforms. Expecting to see an orderly set of harmonics—as one would see from a square wave—I was surprised by the uneven amplitude, frequency and apparent phase distributions. I made several recordings of the signal within a period of about five minutes. Each was different: Both in amplitude and frequency allotment. It is clear (at least to me) that this signal is not being produced by random noise from a novice transmitter, but rather that there is some information encoded in the “hum.” I have little experience in identifying the signatures of digital modulation techniques, but I can send the capture images to anyone who does. I acknowledge that each recording was subject to the speed of my finger to react and record the sound. Hence, the differences I saw might be attributed to the exact moment at which I initiated the capture of each signal. Nevertheless, even if this is the case, the signal is markedly different at each capture, again indicating an imbedded intelligence. I CAN say with certainty that this signal is not 60 cycle hum. Some good minds are needed to analyze this enigma… I do have a theory on what this is…but I’ll first wait to hear all of your comments… Dave -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.6 - Release Date: 2/7/2005 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.7 - Release Date: 2/10/2005 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.7 - Release Date: 2/10/2005 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.7 - Release Date: 2/10/2005 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.7 - Release Date: 2/10/2005 ______________________________________________________________ Spooks mailing list Home: http://mailman.qth.net/mailman/listinfo/spooks Help: http://mailman.qth.net/faq.htm Post: mailto:[email protected] - Visit http://www.spynumbers.com/ for complete information about Spy Numbers Stations
