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3. Antennas & Cables

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    Comparing version 21:17, 25 Feb 2019 by stuart with version 21:39, 25 Feb 2019 by stuart.

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     Estimated detection ranges based on biological data (simultaneous detections between two antenna from different stations):

    9-element - Conservative estimate is in the 10-15km range. Maximum detection range in optimal conditions are probably 20-25 km - we've had numerous examples of simultaneous detections between towers more than 50km apart. However, when animals are on the ground, or roosting, detection range can drops to close to 0. Active animals in the front, or side-lobes of the antenna can be detected from a distance of 1-2km.

    5-element - Conservative estimate is somewhere in the 3-5km for animals in flight. 1-2 km for animals on the ground.

    Mono - Usually only

    6 element antenna - somewhere between 5 & 9. 3-element antenna, somewhere between 5 and mono.

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    Antenna can and have been mounted to just about anything - see our Gallery here. However, just because you can affix them to anything, doesn't mean that the antenna will operate optimally. Most antenna are designed to be 'butt-mounted' extending outward from a structure instead of being affixed at their mid-point. However, this is not possible with many structures and can be logistically complicated and unsafe to install. Consideration should be taken to avoid contact or interference with other metal structures such as supports from a tower that the antenna is affixed to. Masts extending horizontally or vertically off a structure is a useful method.

    Effort should be taken to mount the antenna as far apart as possible (~>1m), especially when they're oriented in the same plane, but this is not always possible.

    Bob Morton from Maple Leaf Communications has provided some more detailed notes on potential losses and the interactions between multiple antenna on one structure here.

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    Version from 21:17, 25 Feb 2019

    This revision modified by stuart (Ban)

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    Version as of 21:39, 25 Feb 2019

    This revision modified by stuart (Ban)

    ...

    Estimated detection ranges based on biological data (simultaneous detections between two antenna from different stations):

    9-element - Conservative estimate is in the 10-15km range. Maximum detection range in optimal conditions are probably 20-25 km - we've had numerous examples of simultaneous detections between towers more than 50km apart. However, when animals are on the ground, or roosting, detection range can drops to close to 0. Active animals in the front, or side-lobes of the antenna can be detected from a distance of 1-2km.

    5-element - Conservative estimate is somewhere in the 3-5km for animals in flight. 1-2 km for animals on the ground.

    Mono - Usually only

    6 element antenna - somewhere between 5 & 9. 3-element antenna, somewhere between 5 and mono.

    ...

    Antenna can and have been mounted to just about anything - see our Gallery here. However, just because you can affix them to anything, doesn't mean that the antenna will operate optimally. Most antenna are designed to be 'butt-mounted' extending outward from a structure instead of being affixed at their mid-point. However, this is not possible with many structures and can be logistically complicated and unsafe to install. Consideration should be taken to avoid contact or interference with other metal structures such as supports from a tower that the antenna is affixed to. Masts extending horizontally or vertically off a structure is a useful method.

    Effort should be taken to mount the antenna as far apart as possible (~>1m), especially when they're oriented in the same plane, but this is not always possible.

    Bob Morton from Maple Leaf Communications has provided some more detailed notes on potential losses and the interactions between multiple antenna on one structure here.

    ...


     
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