Power Level Considerations

0068-EX-PL-2015 Text Documents

InHand Electronics, Inc

2015-02-11ELS_158889

PRODUCT MANAGEMENT & SYSTEMS ENGINEERING Author: Mark Price Project: Test InHand Electronics, Inc. January 30, 2015 – Rev. 0.1 30 West Gude Drive, Suite 550 Rockville, MD 20850 ph. 240‐558‐2014; info@inhand.com www.inhand.com Power Level Considerations The NTIA restricts the maximum signal level to ‐140 dBm (24 MHz BW) as received from an isotropic antenna at a distance of 100 feet from the building where the test is being conducted. Therefore, the maximum power level output from the GSG Signal Generator is limited to conform with this regulation. Antenna distance to nearest exterior wall: 50 ft. Antenna gain: 0 dB (omni antenna) Cable loss, antenna to GSG simulator: 3 dB (3 ft RG‐58 plus connector loss) Using the free space loss calculation for radio propagation: Loss (dB) = 20 log10 (4π * Distance / λ) Where λ = wavelength: @ 1575 MHz= 19 cm = 0.62 ft Distance = 150 ft total => 50 ft from antenna exterior wall + 100 ft to restricted perimeter Loss = 70 dB = 20 log10 (4π * 150/0.62) Transmit Power ‐67 dBm Cable Loss ‐3 dB Transmit Antenna Gain 0 dB © Copyright 2014 – All Rights Reserved Page 1 of 2 Revision: Rev. 0.1 Document Number:0.1 GPS_Simulator_Power_considerations.docx Last Saved: 1/30/2015 3:57:00 PM

PRODUCT MANAGEMENT & SYSTEMS ENGINEERING Author: Mark Price Project: Test Free space loss: 150 ft ‐70 dB Receive Antenna Gain 0 dB ‐140 dBm Using the free space calculation is a worst case scenario as the wall and any other obstructions will likely reduce the signal even more. Therefore, setting the power output of the GSG‐51 Simulator = ‐67 dBm or less will guarantee compliance. Reference: http://en.wikipedia.org/wiki/Path_loss Equipment to be Tested InHand Electronics, Inc is a manufacturer of handheld devices for Consumer, Aerospace and Defense, Healthcare, Transportation, Industrial Control and many other applications. Many of our products contain a GPS receiver. To test our equipment ‐ including GPS receivers and their antennas ‐ in our production test facility, it is desirable to radiate a simulated GPS signal. © Copyright 2014 – All Rights Reserved Page 2 of 2 Revision: Rev. 0.1 Document Number:0.1 GPS_Simulator_Power_considerations.docx Last Saved: 1/30/2015 3:57:00 PM


Document Created: 2015-01-30 15:57:55
Document Modified: 2015-01-30 15:57:55
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