EMTRAC Shows Compliance with VTA Transmission Specs

September 2, 2010 - As part of a third party installation acceptance test for VTA of San Jose, California in July of 2010, Caltrans was asked to verify compliance of the installation with standard specifications. In the process of acceptance testing, the range of EMTRAC equipment transmissions were calculated along El Camino Real in Santa Clara County. The test was supervised by Caltrans engineers; a sample of field observations were generated with the following test procedures:

A floating car was used to replicate a VTA bus operating along El Camino Real, with the antenna placed at approximately 30 inches above pavement resting on the dash board inside of a sub-compact Caltrans staff car

Revenue service conditions for this deployment type would have involved a transit bus with antenna mounted approximately 10 feet above pavement. Under the circumstances the test used an antenna deployed seven and one-half feet below standard height, which—as anticipated—significantly reduced observed detection range. Actual test results yielded acceptable revenue service ranges for transit applications with the minimum transmission distance measured at 1300 feet

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