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    Sam Drazin
    Frequency Coordination for ULX-D High Density Channels
    Topic posted July 9, 2012 by Sam DrazinExpert, last edited August 17, 2012 
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    Title:
    Frequency Coordination for ULX-D High Density Channels
    Description:

    Frequency Coordination Scenarios

    Scenario 1: ULX-D in High Density mode is the only wireless system in use

    Selecting frequencies without Wireless Workbench software: - If the only wireless system in use is ULX-D with High Density mode enabled, GROUP SCAN on the receiver is actually the most effective set-up method. The receiver will scan its full bandwidth and provide frequencies with a measured signal level below -90 dBm listed in order from best to worst. Operating range of a High Density mode channel at the bottom of the list will decrease as a result of the lower signal-to-noise ratio. However, group scan deploys the highest quality frequencies first. If your receivers are networked to each other, a push of a button will deploy the best frequencies across all your channels of that band.

    Using Wireless Workbench 6.4 or later to calculate frequencies:

    • Use "More Frequencies" as the Compatibility Level preference for ULX-D channels in High Density mode so WWB6 does not consider intermodulation spacing for ULX-D High Density channels. Intermodulation distortion does not need to be considered when using only ULX-D in High Density mode.
    • Use a ULX-D receiver with High Density mode enabled to capture WWB6 scan data covering the relevant band(s).
    • Set the Exclusion Threshold at the lowest level that still allows the calculator to find the required number of High Density channels. This may take some iteration. If the number of required channels still cannot be found with the threshold at -90 dBm, then High Density mode will likely not work well enough to be usable.

    Using the Axient Spectrum Manager to calculate frequencies:

    • Although the Spectrum Manager can coordinate frequencies for ULX-D in High Density mode, Group Scan from the ULX-D receiver is the most effective setup method at this time.


    Scenario 2: ULX-D in High Density mode is not the only wireless system in use, but it is located in a separate RF zone

    Selecting frequencies without Wireless Workbench software:

    • Coordinate and deploy frequencies to the other wireless devices first.
    • Turn the transmitters from those devices on and put them in their closest realistic proximity to each other and to the ULX-D receive antennas. This will enable ULX-D to avoid the frequencies used by the other systems. In addition, if it turns out that the zone is not adequately isolated, it will help the ULX-D scan to see and avoid intermodulation products.
    • Lastly, use group scan on a ULX-D receiver to select the ULX-D High Density channels. The receiver will scan its full bandwidth and provide frequencies with a measured signal level below -90 dBm listed in order from best to worst. Operating range of a High Density mode channel at the bottom of the list will decrease as a result of the lower signal-to-noise ratio. However, group scan deploys the highest quality frequencies first. If your receivers are networked to each other, a push of a button will deploy the best frequencies across all your channels of that band.

    Using Wireless Workbench 6.4 or later to calculate frequencies:

    • Assign the ULX-D High Density channels in your inventory to Zone(s) which consist only of High Density channels.
    • Use "More Frequencies" as the Compatibility Level preference for ULX-D devices in High Density mode so WWB6 does not consider intermodulation spacing for ULX-D High Density channels. Intermodulation distortion does not need to be considered when ULX-D in High Density mode are the only systems in a zone.
    • Use a ULX-D receiver in High Density mode to capture WWB6 scan data covering the relevant bands.
    • Set the Exclusion Threshold at the lowest level that still allows the calculator to find the required number of High Density channels. This may take some iteration. If the number of required channels still cannot be found with the threshold at -90 dBm, then High Density mode will likely not work well enough to be usable.

    Using the Spectrum Manager to calculate frequencies:

    • The Spectrum Manager is only capable of coordinating frequencies within the same zone and cannot be used as the frequency calculator in this scenario.


    Scenario 3: ULX-D in High Density mode is being operated with other types of wireless in the same zone

    Selecting frequencies without Wireless Workbench software:

    • This is a risky scenario. Be sure to leave time to verify the range and performance of each of your high density channels with all other transmitters in use.
    • To improve performance, use frequency bands for the ULX-D High Density channels that cover a different frequency range than the other wireless devices.
    • Coordinate and deploy frequencies to the other wireless devices first.
    • Turn the transmitters from those devices on and put them in their closest realistic proximity to each other and to the ULX-D receive antennas. This will enable ULX-D to avoid the frequencies used by the other systems. In addition, it will help the ULX-D scan to see and avoid intermodulation products.
    • Lastly, use group scan on a ULX-D receiver to select the ULX-D High Density channels. The receiver will scan its full bandwidth and provide frequencies with a measured signal level below -90 dBm listed in order from best to worst. Operating range of a High Density mode channel at the bottom of the list will decrease as a result of the lower signal-to-noise ratio. However, group scan deploys the highest quality frequencies first. If your receivers are networked to each other, a push of a button will deploy the best frequencies across all your channels of that band.

    Using Wireless Workbench 6.4 or later to calculate frequencies:

    • The frequency compatibility calculator does not adequately account for this scenario. If you need to use Wireless Workbench to calculate frequencies, turn High Density mode off to get the best results.

    Using the Spectrum Manager to calculate frequencies:

    • The Spectrum Manager compatibility calculator does not adequately account for this scenario. If you need to the Spectrum Manager to calculate frequencies, turn High Density mode off to get the best results.
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