User Manual

Confidential
Patent #’s 7,420,471
5,939,986 and 6,810,353
Patent Pending
Page 4 of 6
Strata Proximity Systems Surface Proximity Module Users Manual v1.0
Confidential and Proprietary
October 6, 2011
1.2 Frequency of Operation
The Underground Proximity Generator will transmit on a frequency of 73 kHz and receive on a
frequency of 916.48 MHz
1.3 Label Information
The Surface Proximity Module label is located on the bottom face of the shunt. A picture of the
Strata label is below:
The Strata label defines the model and serial number of the Surface Proximity Module.
1.3.1.1 MSHA Blasting Distance
MSHA has published Program Policy Letter P11-V-07 concening Two Way Communications and
Blasting Circuits.
SPS magnetic field generators produce a magnetic field that at 100 kHz or .1000 MHz does not
achieve the Critical H Field until 1.42 m with a blasting cap having a pickup area of 10 sq.
meters.
SPS magnetic field generators are safe to 1.42 m from the blasting caps. SPS does recommend
a minimum distance of 25’ as a precaution.
1.3.1.2 Pennsylvania Blasting Distance
At this date, Pennsylvania has not made a recommendation or statement concerning surface
systems.