MEASUREMENTS OF LEAKY COAXIAL CABLES AND POSSIBLE APPLICATIONS TO TRAIN COMMUNICATION

The electrical and radiation properties of the Radiax have been measured. The main results are: i) the surface wave exists, ii) the radial radiation follows 1/r2 relation for frequency below 190 MHz and 1/r relation for frequency near 400 MHz, iii) the transverse radiation pattern is nearly omnidirectional, iv) the coherent band-width is on the order of 3 MHz and the operating frequency range is several hundred megahertz; and v) better coupling efficiency is observed at lower frequency. Possible applications for railroad communication are discussed.

• Supplemental Notes:
  • This work was sponsored by the Office of Research and Development, FRA/DOT.
• Corporate Authors:

  Transportation Systems Center

  55 Broadway, Kendall Square
  Cambridge, MA  United States  02142
• Authors:
  • Yoh, P
  • Esposito, Rita
  • Gagnon, R
  • Kodis, R D
• Publication Date: 1974-5

Media Info

• Features: Figures; Tables;
• Pagination: 90 p.

Subject/Index Terms

• TRT Terms: Communication and control; Communication systems; Radio

Filing Info

• Accession Number: 00084727
• Record Type: Publication
• Source Agency: Federal Railroad Administration
• Report/Paper Numbers: FRA-ORD&D-74-43 Final Rpt.
• Files: NTIS, TRIS, USDOT
• Created Date: Jul 2 1977 12:00AM