JFK Assassination Forum

JFK Assassination Plus General Discussion & Debate => JFK Assassination Plus General Discussion And Debate => Topic started by: Joe Elliott on September 17, 2020, 10:50:08 PM

Title: Question about the HSCA BBN “Acoustic” Map F-337
Post by: Joe Elliott on September 17, 2020, 10:50:08 PM

Question about the HSCA BBN “Acoustic” Map F-337

The copies of F-337 that I have found on-line are too poor to read. I cannot clearly see:

•   The location of the microphones, the “microphone array” nor the “channel numbers”.

•   The Target locations.

Dr. Barger testimony would be a lot easier to understand if I had access to a map I can read. Thank you.

Title: Re: Question about the HSCA BBN “Acoustic” Map F-337
Post by: Joe Elliott on September 18, 2020, 12:05:06 AM

If one cannot find a good BBN map, how about explaining in words.

Where is Target 1, 2, 3, 4 ?

I understand there are 36 microphones. Channels 1 through 12, each channel with microphone 1, 2, 3, as near as I can make out. Where are these?

Title: Re: Question about the HSCA BBN “Acoustic” Map F-337
Post by: Joe Elliott on September 26, 2020, 03:38:42 AM

I have been poking around the internet. I still have not found a really great map that clearly shows where all of the microphones are used in the August 20, 1978 test firings at Dealey Plaza. That is the location of 1 ( 1 ) through 1 ( 12 ), 2 ( 1 ) through 2 ( 12 ) and 3 ( 1 ) through 3 ( 12 ). And a clear map showing the locations of Target 1, Target 2, Target 3 and Target 4, the targets the shooters were aiming at in their 1978 firing tests. But I have found one that just barely shows the locations of Target 1, Target 2, Target 3 and Target 4.

http://www.aarclibrary.org/publib/jfk/hsca/reportvols/vol8/pdf/HSCA_Vol8_AS_2_BBN.pdf (http://www.aarclibrary.org/publib/jfk/hsca/reportvols/vol8/pdf/HSCA_Vol8_AS_2_BBN.pdf)

And go about half way down, to Page 49 of 95 in the pdf document, labeled as Page 81 (listed at top of page) and Page 41 (listed at the bottom on the page).

From it, I think it is obvious why a clear map is so hard to find. And why Mr. Griffith did not volunteer a clear version of this map. One does have to ask ourselves, “Why are the BBN defenders so reluctant to present a clear map of this information?

Target 1: Is roughly where the limousine was at z155.
Target 2: is roughly where the limousine was at z224.
Target 3: Is roughly where the limousine was at z313.
Target 4: is roughly where Mr. Tague was standing. The limousine got closest to this spot around z-463.

So, from BBN’s 1978 Exhibit F-337:

Test	Beginning Time of	Zap.	Zap.	Microphone Array	Rifle	Target	Correlation	Strong	Fluke
ID	First impulse on	Frame	Frame	and	Location	Location	Coefficient**
	Tape Segments (sec)	BBN	Thomas	(Channel Numbers)
A	136.20			No Correlations Higher Than			0.5
B	137.70	168	176	2 ( 5 )	TSBD*	1	0.8	Strong
C	137.70	168	176	2 ( 5 )	TSBD*	3	0.7		Fluke
D	137.70	168	176	2 ( 6 )	TSBD	3	0.8	Strong	Fluke
E	137.70	168	176	2 ( 6 )	KNOLL	4	0.7		Fluke
G	139.27	196	205	2 ( 6 )	TSBD*	3	0.8	Strong
H	139.27	196	205	2 ( 6 )	TSBD	3	0.6
I	139.27	196	205	2 ( 10 )	TSBD	3	0.6		Fluke
J	139.27	196	205	3 ( 5 )	KNOLL	3	0.6		Fluke
K	140.32	216	224	2 ( 11 )	TSBD*	3	0.6
L	145.15	304	313	3 ( 4 )	KNOLL	3	0.8	Strong
M	145.15	304	313	3 ( 7 )	TSBD*	2	0.7		Fluke
N	145.15	304	313	3 ( 8 )	TSBD	3	0.7		Fluke
O	145.61	313	321	3 ( 5 )	TSBD	3	0.8	Strong	Fluke
P	145.61	313	321	3 ( 6 )	TSBD	4	0.8	Strong
Q	145.61	313	321	3 ( 8 )	TSBD*	2	0.7	Fluke
R	146.30			No Correlations Higher Than			0.5

In the following table, to show the estimated Zapruder frame of that shot, I will give an answer like z168/z176. The first number, in this case z168, will be Dr. Barger’s estimate from 1978. The second number will be Dr. Thomas’s estimate.

So, of the 5 shots now accepted by the Dr. Barger and Dr. Thomas, where were these shots aimed at?

For the shot at 137.70, or shot z168/z176, the acoustic tests found “clear evidence” that there was a shot fired at that time, and the rifle was aimed at the z152 location, the z313 location, and at Mr. Tague. This is clearly impossible. But they found clear acoustic evidence that all locations were fired at, during that moment in time.

For the shot at 139.27, or shot z196, z205, the acoustic tests found “clear evidence” that there was a shot fired at that time, and the rifle was aimed at the z313 location. It should have been fired at much closer to the z222 location, but this shot was actually fired at the z313 location. The BBN Acoustic evidence “proves” this.

For the shot at 140.32, or shot z216/z224, the acoustic tests found “clear evidence” that there was a shot fired at that time, and the rifle was aimed, once again, at the z313 location. This one should have been aimed directly at the z224 location.

For the shot at 145.15, or shot z304/z313, the acoustic tests found “clear evidence” that there was a shot fired at this time, and the rifle was aimed at the z224 location (finally), z313 (bingo).

For the shot at 145.15, or shot z313/z321, the acoustic tests found “clear evidence” that there was a shot fired at this time, and the rifle was aimed at the z224 location, z313 (bingo) and Mr. Tague (what?).


If the Acoustic tests were getting valid results, because the Dictabelt tape really was made by a motorcycle in Dealey Plaza, they would have gotten the best acoustic match for the z168/z176 shot while firing at the z152 or the z224 Target. Instead they got no match for the z224 Target, but found an acoustic match when firing at the z313 Target.

Similarly, they got no good match for z196/z205 shot firing at the z224 Target, but got a good match when aiming at the z313 Target.

Similarly, they got no good match for the z216/z224 shot firing at the z224 Target, but got a good match when aiming the z313 Target.

They finally did get a good result for the z304/z3313 shot firing at the z313 Target, both from the TSBD and the Grassy Knoll! but also a pretty good match aiming at the z224 position.

They finally did get a good result for the z313/z321 shot firing at the z313 Target, but just as good a match when aiming at the Mr. Tague position, and a pretty good match aiming at the z224 position.


If the Acoustic Tests were good, we should get good results for:
•   The location of the motorcycle with each shot.
•   The location of the shooter with each shot.
•   The location that the shooter was aiming at with each shot.

Only on the first point do we get good results. Getting good results in 2 out of 3, or 1 out of 3, is not good enough. There should be good reasons are all three, location of motorcycle, location of shooter and location of the target. But the Acoustic Tests pretty consistently gives results that contradict itself. Often showing a good match for shots fired from both the TSBD and the Grassy Knoll. And giving target locations that make no sense. As if it is giving random results, not from a motorcycle that was at Dealey Plaza but a motorcycle that was somewhere else, like at the Trade Mart Center.

The only good result is for the location of the motorcycle. But it was known before the tests were run what sort of pattern they should be looking for. Perhaps they only had time to do some of the correlation checks, not all 2,592 that were needed. Or, if somehow all 2,592 were done in 15 days, the checkers became more alert when they reached the sections, they expected to find matches, and less alert when they believed they were getting into areas where no match should be found.