RF Recording of "E-ZPass" Electronic Tolling System in Ohio and Virginia

<p>This dataset contains IQ recordings of the "E-ZPass" electronic tolling system used in the Eastern portion of the United States, which operates in the 915MHz ISM band.</p> <p>Recording details:</p> <ul> <li>Format: Complex Float 32 (a pair of 32-bit floats for each sample)</li> <li>Software: GQRX</li> <li>Hardware: R820T-based RTL-SDR with the default ~4.5" dipole antenna</li> <li>Center frequency: 915.5MHz</li> </ul> <p>These recordings were made on 3 different days:</p> <ul> <li>The first 3 recordings were made on November 22nd, 2018, along the Ohio Turnpike, with a bandwidth of 2.4MHz.</li> <li>The next 4 recordings were made on November 23rd, 2018, also along the Ohio Turnpike, with a bandwith of 3.2MHz and different gain values (as controlled by the GQRX "LNA" slider in the "Input controls" pane): <ul> <li>0.0dB: gqrx_20181123_210500_...</li> <li>4.8dB: gqrx_20181123_205740_...</li> <li>10.0dB: gqrx_20181123_210814_...</li> <li>15.2dB: gqrx_20181123_211514_...</li> </ul> </li> <li>The final 2 recordings were made on May 25th, 2019, in Virginia, with a bandwidth of 3.2MHz and a gain of 49.8dB. <ul> <li>Entering the toll road: gqrx_20190525_194416_...</li> <li>Exiting the toll road: gqrx_20190525_195900_...</li> </ul> </li> </ul> <p>The RF protocol is described in Document # TS 360100-034 by Kapsch TrafficCom IVHS Inc., "Active TDM Over-Air Specification for Electronic Toll Communications". There is a copy of the document on the internet archive: <a href="https://archive.org/details/rev-c-active-tdm-over-air-spec-for-electronic-toll-communications" target="_blank" rel="noopener">https://archive.org/details/rev-c-active-tdm-over-air-spec-for-electronic-toll-communications</a></p>