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  • Users: robertjo24
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  1. robertjo24

    Yagis and phasing harness

    We have a site with a 900 MHz ISM band data radio (902-928 MHz FHSS), connected to a pair of Yagi antennas through a phasing harness. The antennas are stacked vertically as per manufacturer’s instructions to increase directional gain. What would be the result if one of the Yagi antennas were...
  2. robertjo24

    Protecting other systems from VFD's

    I was hoping someone could put me on to some good information regarding protecting other systems (communications, video, etc) from the EMI generated by VFD’s. Here is the issue… We have several locations where we will have small (12X14) building that houses motor switchgear and controls...
  3. robertjo24

    New main breaker panel practices

    It has been standard practice for some time to tie the neutral and ground bus bars in the main breaker panel. Then, all subesquent sub-panels and devices the neutral and grounds are kept seperate. Is it a new standard or code to not tie the neutral and ground bus bars in the main panel and the...
  4. robertjo24

    Omron PLC to B&B serial/fiber converter

    We have a station that has an Omron PLC. It was connected to the main PLC via a B&B 485 to fiber converter. The fiber converter went bad and was replaced, and now the link does not work on the new fiber converters. The Omron tech stated the communications on the Omron PLC is proprietary, not...
  5. robertjo24

    ABB Totalflow EFM Communications Information

    Does anyone know of a good primer on the ABB Totalflow EFM communications protocol? We are troubleshooting a communications issue, and it would be greatly simplified if I understood the protocol. I look online, and all I find is reference to protocol drivers and software simulators. If I could...
  6. robertjo24

    Looking for an Industrial Router

    Has anyone run accross an industrially rated router to use in an outdoor cabine w/o air con?
  7. robertjo24

    Industrial router ???

    I am looking for an industrial rated router, one or two ethernet interfaces, and at least one serial interface capable of supporting a frame relay connection. An integrated CSU/DSU would be best. Any ideas?
  8. robertjo24

    IP Address Database Utility ??????

    I am looking for a simple utility/database (preferably MS Access), to keep track of our growing network. We utilize a great number of static addresses for field equipment, and we are running into a problem keeping track of IP addresses. As we grow, we are finding it more and more difficult to...
  9. robertjo24

    Antenna files for PathLoss 4.0

    I use PathLoss 4.0 to calculate VHF/UHF, point to point, and point to multi-point radio systems. I find this program extremely useful, and very cost effective. To most effectively and accurately calculate coverage maps and path profiles, I need antenna data files for this program. The...

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