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  1. robertjo

    Earthing

    Great info for us all! Thanks for the post.
  2. robertjo

    Fiber Optic Cable Handling

    Take a look here: http://www.corningcablesystems.com/web/college/college.nsf/ehtml/index There may be some interesting info in their tutoials and FAQ's.
  3. robertjo

    Power surge question

    It has been my experience, (unfortunate and costly experience), that any unprotected device in a system affects the entire system. I have had equipment that was “protected” destroyed by transients coming from seemingly insignificant peripherals. I don’t think that there is any real protection...
  4. robertjo

    max distance from AP to antenna wireless

    For most WLAN installations, 60' outdoors should be no problem if there is an unobstructed line of sight between antennas. As for what to watch out for: 1)If you are using externally mounted antennas, keep the cable runs as short as possible. Line loss is much greater at the higher frequencies...
  5. robertjo

    Wireless Serial & Wireless LAN Discussion

    PLCINTEGRATOR, The scenario you lay out above would work in an office computing environment, but I am not sure it would work for field automation, where my focus has been lately. Many existing devices in the field (i.e. RTU's, PLC,s flow computers, etc.) mainly support serial communications of...
  6. robertjo

    Wireless Serial & Wireless LAN Discussion

    I would like to get your opinions, and spur discussion on the role of wireless communications in the industrial control and automation arena. Do you currently utilize wireless communications in your control systems? If so, what type (i.e. serial radios, WLAN, integrated serial radio and RTU)...
  7. robertjo

    wireless design (LAN segment)

    Just as a thought: If trenching for cable/conduit is prohibitively expensive, you can still do a wireless link around your obstruction. Have you ever looked at Motorola’s Canopy radio (http://motorola.canopywireless.com/) ? The cost isn’t too bad, installation is a snap, and they have point to...
  8. robertjo

    wireless design (LAN segment)

    Look at www.berktek.com. Thay have multi pair Cat-5e bulk cable.
  9. robertjo

    ROOFTOP INTERNET: REPLACES DSL & CABLE?

    Teligent tried it, and failed. Sprint tried it in Houston (BroadBand Direct), and failed. The issue is with signal power from the remote/user end. The main transmitter has the gain to get the signal out to the subscriber, but the subscriber modules typically do not have the power to get back to...
  10. robertjo

    Internet Explorer Search Function Question

    Done, Thanks
  11. robertjo

    Operational Ampifier

    You may get a better response if you post this question in the Programmable Logic Controllers (PLC) Forum.
  12. robertjo

    Internet Explorer Search Function Question

    This may not be the proper forum for this question, but I thought I would try here first. I have an issue with Internet Explorer. First, the facts. I am running Win 98 with IE 6.0.2800.1106, SP1 installed. The problem: When I click on the search icon, the search window comes up on the left...
  13. robertjo

    Data Interference

    None that I ever knew of. I would suggest that when pulling drops, pull two of each while you are at it. It is easier to pull two now, then have to come back later and wish you had.
  14. robertjo

    Radio propagation software

    We use PathLoss. I looked into Softwright, and other higher end propagation analysis tools, and I found they were too expensive and too complicated for what I needed to do. If I needed to design an entire metropolitan cellular or SMR system, these higher end tools would fit the bill and justify...
  15. robertjo

    Single to Multi mode conversion

    Try Allied Telesyn. Here is a MM to SM converter, place one on each end. Much cheaper than new fiber. http://www.alliedtelesyn.com/allied/products/viewproduct.asp?category=3&id=97&country=2&lang=en
  16. robertjo

    Blocking 2.4 GHz Signals ?Question?

    Are you trying to shield for WLAN security, prevent interference for other devices? Are you looking to shield an entire room, window? Why not try woven copper screen material, (much like screen door material)? I used a shield cage (8X8 room), made from this material for tuning/testing RF...
  17. robertjo

    Outlook 2002 Rules Wizard is no Wiz

    I have a little problem with MS Outlook 2002. I set up some rules in the “Rules Wizard”, to move emails to specified folders based upon family member’s email addresses. The “Rules Wizard” is set to run each when emails are received. When I open Outlook, and receive emails, the “Rules Wizard”...
  18. robertjo

    PBX -- signals

    It depends. (Don’t you just love that answer) Old style key switches would allow one, to several analog extensions per phone set. Older PBX’s would support analog and digital extensions, (depending on what cards are loaded into the PBX, and firmware revision, etc.). Newer PBX’s can support many...
  19. robertjo

    Does a notebook battery discharge by itself?

    All rechargeable batteries have some leakage, and will discharge over time, even when not connected to any device. Some computers will consume some battery power even when “powered down”, by keeping some circuits powered to control the turn on function. The best bet for keeping your laptop...
  20. robertjo

    PLC brands comparison

    For small, powerfull, cost efficient PLC's, try Automation Direct,(www.automationdirect.com/store/Shopping/Catalog/PLC_Hardware). Small form factor Easily configured Power efficient Wide range of sizes for required use No, I am not a salesman, just an observer. We have used several PLC's in...

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