I thought that Dr. Donald B. Thomas adequately addressed the acoustical evidence in Chapter 17 and 18 of his book Hear No Evil, See No Evil (in Chapter 18, he refers to certain film frames or photographs to confirm McLain's position). I also recall Thomas' visual presentation at a JFK Lancer Conference demonstrating that McLain was in the correct position. I believe it's available on DVD through JFK Lancer Publications.
Hi again, Gerry.
If I may, I wrote this article in response to a piece that Don Thomas wrote about Vince Bugliosi and myself, where he claimed that Vince and I were "Bamboozled". The sad thing is, is that Thomas just doesn't know what he's talking about. As you will see, one little sound disproves Thomas' entire theory regarding a second instance of crosstalk that he claims precede the sounds BBN claimed were gunshots. This sound called "Heterodyne tones" surround the voice Thomas says is crosstalk. The voice of Sheriff Decker, which as you know is labeled "crosstalk" and it contains no heterodyne tones becuase it wasn't spoken over the channel one radio frequency, rather, it was picked up from the loudspeaker of another police radio tuned to channel two, and it was picked up by an already open microphone that is stuck open. This piece I wrote is similar to the paper Vince Bugliosi asked me to write for his book, which appears in the "End Notes" (CD Rom) of his book, but with some additional information. Some of which includes the erroneously labeled "Carillon Bell" that isn't a "bell" at all, which I proved in 1982, and the people at IBM confirmed. It's electronic interfernce which occurred throughout the channel 2 radio frequency that day, making many different sounds, and these sounds only occurred during the time when the dispatcher's microphone was keyed on. IBM produced a report on the sound, along with the topic of the entire DPD open microphone investigation. I hope you will take time and read these articles to give you a better understanding of the open microphone sequence on the Dallas police Dictabelt recording of channel one, and the Gray Audograph recording of channel two. Thanks so much.
https://jfkfiles.blogspot.com/2007/07/of-crosstalk-and-bells-rebuttal-to-don.html https://www.jfk-online.com/acousibm00.html