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

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.

Recording details:

• Format: Complex Float 32 (a pair of 32-bit floats for each sample)
• Software: GQRX
• Hardware: R820T-based RTL-SDR with the default ~4.5" dipole antenna
• Center frequency: 915.5MHz

These recordings were made on 3 different days:

• The first 3 recordings were made on November 22nd, 2018, along the Ohio Turnpike, with a bandwidth of 2.4MHz.
• 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):
  • 0.0dB: gqrx_20181123_210500_...
  • 4.8dB: gqrx_20181123_205740_...
  • 10.0dB: gqrx_20181123_210814_...
  • 15.2dB: gqrx_20181123_211514_...
• The final 2 recordings were made on May 25th, 2019, in Virginia, with a bandwidth of 3.2MHz and a gain of 49.8dB.
  • Entering the toll road: gqrx_20190525_194416_...
  • Exiting the toll road: gqrx_20190525_195900_...

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: https://archive.org/details/rev-c-active-tdm-over-air-spec-for-electronic-toll-communications