gar
Senior Member
- Location
- Ann Arbor, Michigan
- Occupation
- EE
090607-1255 EST
fields5491:
Your suggestion of the 75 Hz signal that you think you detected might be submarine communication is virtually nil.
See
http://en.wikipedia.org/wiki/Communication_with_submarines#Extremely_low_frequency
Here it references 76 Hz for the US and 82 Hz for the Soviet's. The resulting signal level at a receiver is very small. It will require a very narrow band receiver with a very low noise level and probably some form of correlation detection to receive this signal. No way will your instrument detect this signal unless you are somewhere near the transmitter.
Take your instrument out in the middle of nowhere. What frequencies and signal levels do you measure? Anything at 45, 60, 75 and 82 Hz? How about up to the 100th harmonic of 60 Hz? Next in a screen room apply a 60 Hz sine wave from a clean signal generator. What frequencies do you see?
Your reference to Graham-Stetzer Research really took me nowhere relative to a 75 Hz signal because I did not know what paper to look at.
Although uncorrelated with 75 Hz I did read through most of "Testimony of Dave Stetzer in Lawsuit Filed on Behalf of Michigan Attorney General" which relates to stray voltage and drifts off at the end to other human interaction.
He provided very little numerical data, mostly qualitative statements, and toward the end more like testimonials.
Using a 200% neutral will not eliminate ground currents, however, it should reduce the ground currents. Bad splices may be even more of a factor. He provided no quantitative data to compare the ground currents or stray voltages in the farm areas where the one Wisconsin power company reduced the number of grounding points and went to the larger neutral. If substantial currents existed on the farms what were their magnitudes and how much were they reduced by the distribution system change?
.
fields5491:
Your suggestion of the 75 Hz signal that you think you detected might be submarine communication is virtually nil.
See
http://en.wikipedia.org/wiki/Communication_with_submarines#Extremely_low_frequency
Here it references 76 Hz for the US and 82 Hz for the Soviet's. The resulting signal level at a receiver is very small. It will require a very narrow band receiver with a very low noise level and probably some form of correlation detection to receive this signal. No way will your instrument detect this signal unless you are somewhere near the transmitter.
Take your instrument out in the middle of nowhere. What frequencies and signal levels do you measure? Anything at 45, 60, 75 and 82 Hz? How about up to the 100th harmonic of 60 Hz? Next in a screen room apply a 60 Hz sine wave from a clean signal generator. What frequencies do you see?
Your reference to Graham-Stetzer Research really took me nowhere relative to a 75 Hz signal because I did not know what paper to look at.
Although uncorrelated with 75 Hz I did read through most of "Testimony of Dave Stetzer in Lawsuit Filed on Behalf of Michigan Attorney General" which relates to stray voltage and drifts off at the end to other human interaction.
He provided very little numerical data, mostly qualitative statements, and toward the end more like testimonials.
Using a 200% neutral will not eliminate ground currents, however, it should reduce the ground currents. Bad splices may be even more of a factor. He provided no quantitative data to compare the ground currents or stray voltages in the farm areas where the one Wisconsin power company reduced the number of grounding points and went to the larger neutral. If substantial currents existed on the farms what were their magnitudes and how much were they reduced by the distribution system change?
.
