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Julia Austin

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Posts posted by Julia Austin


  1. Hi - to access SDR's data filtering, go to the Site menu, choose View Database, pick the site number and click OK.  There is a filter button on the lower left side of the screen.  Click the Filter button, and then Create New, and you can create whatever type of filter you want for individual channels or groups of channels.  Let me know if I have misunderstood what you need.


  2. The complete obstruction lighting package, including the lights and integrated PV power supply) is provided by Flash Technology, using Dialight manufactured lights.

     

    Electricity loads

    AC

    DC

    Top beacon

    12 watts in flashing mode

    12 watts in flashing mode, 24 watts in steady mode

    Side markers

    6.8 watts each

    3.5 watts each

    Controller

    4 watts

    4 watts

    Monitoring unit

    7 volt-amps

    7 watts

    TOTAL

    36.6 watts

    30 watts


  3. The FAA has described specifications for photovoltaic (PV) systems used to power obstruction lighting systems in Engineering Brief No. 76. Specifically, it requires a minimum of 7 days operational autonomy with little to no recharge of batteries. Our systems were designed to comply with this standard. In cold weather, cloudy or snowy conditions, the batteries could drain more quickly. This is why we have included the battery monitoring service in our complete lighting system. 


  4. The PV power supply is designed to be mounted to the weather-proof pallet used to ship the integrated lighting system. An analysis of soil stability is an essential part of the pre-installation site assessment. Please review Appendix B of the 80m XHD Manual for an explanation of anchor selection and soil assessment. If you are installing on solid ground, a concrete base for the power supply system is not necessary. If you are installing in muddy or damp conditions, it?s possible to pour a concrete pad, but keep in mind that these conditions may also pose a challenge in anchoring the tower.


  5. Yes, you can adjust guy lengths while lifting and adjust the tensioning as needed. The magnitude of the tension forces ? 375 lbs for the 3/8 inch cable and 255 lbs for the 5/16 in cable ? requires use of a mechanical assist. We used a technique described in the ANSI standard, the Tangent Intercept Method, which is a line-of-sight method. More information about this method for tensioning is described in the NRG 80m XHD TallTower Installation Manual and Specificationshttp://www.nrgsystems.com/TechSupport/Documentation.aspx


  6. We provide an autonomous system of batteries and photovoltaic (PV) panels, along with an integrated controller and monitoring system. Our power supply was specifically designed to meet the needs of this fully integrated lighting system. We offer two power supply solutions ? one for customers in northern climates with lower sunlight levels and another for customers in locations with steadier, fuller sunlight. For more information, please contact our sales department.

     


  7. The 80 m ginpole was designed with two jumper struts to improve strength and durability. It is likely you?ll be able to use the ginpole many times and for many years, but it is dependent upon the complexity of each installation. After each tower raising and lowering, we suggest checking your gin pole for wear, including the proper alignment and functioning of each component. 


  8. Raising and lowering the tower requires two pulley-block lines and an additional ?dead end? line affixed to the gin pole rocker plate. A five-part line is necessary to ensure equal distribution of the tower lift load across the base plate. Without the five-part line, the two-fifths (2/5), two-fifths (2/5), and one-fifth (1/5) load distribution from the top to the bottom of the rocker plate is disrupted and can result in gin pole failure.


  9. Anchor requirements are site specific ? soil types must be analyzed as part of your pre-installation planning process. Correct anchor selection is extremely important to the integrity of the tower structure. It must take into account soil type, maximum winds expected, icing and other weather conditions, plus include a suitable safety-factor. Please review Appendix B of the 80m XHD Manual and, if you aren?t sure what anchor-types are required, please speak with a civil engineer to ensure proper selection and installation. The 8-inch double-helix screw-in anchors are available to purchase from NRG Systems as an option. Screw-in anchors are commonly used for normal clay soils without rocks.


  10. This new winch is currently not approved by NRG for use in raising/lowering 60m XHD towers. With the 80m tower, a longer winch cable is needed to accommodate the five-part line configuration. Raising and lowering the 60m tower with this set-up would require using the outermost wraps of cable, thereby exerting more force on the winch. In addition, the three-part line configuration of the 60m tower would result in higher forces. 


  11. The bolted joints add significant axial compression strength to the tower joint. Based on our experience, the most frequent cause of tower failure is due to excessive tower ice loading.  In an icing event, the weight of accumulated ice on upper levels of the tower increases loads on lower level tubes.  At a certain level of force, tubes will ?self flare,? meaning the tubes literally compress onto one another.  This compression results in a shorter tower which lessens guy wire tension. The tower guy wires ?sag? and the structural strength of the tower is compromised from improperly tensioned guy wires. At this point tower failure becomes more probable. The bolted joints minimize the risk of this happening. They also make for a more rigid, easier-to-manage tower during installation.

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