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3. Antennas & Cables

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    Comparing version 15:08, 21 Sep 2016 by stuart with version 21:17, 25 Feb 2019 by stuart.

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    Antenna Types:.

    A variety of antenna options exist for VHF telemetry. To date, collaborators have used 9, 6, 5 and 3-element yyagiwe have used 9-element and 5-element Yagi directional antennas, and single-pole omni-, j-pole-directional antennas. 9-element Yagis have a long, very narrow detection range, whereas 3, 5, or 6-element Yagis have a relatively shorter and wider detection range.  Generally 9-element antenna are great for creating long, linear invisible fences to detect passing animals or to detect flights, or departures of animals from Omni-directional antennas are best suited for determining species presence-absence patterns (e.g. seabirds at a colony), but not for providing directional information (e.g. departure directions of songbirds from a stopover site). specifici Coax Cables:  sitesConnectors. Smaller 6, 5, or 3-element antenna are better forWhen ordering antennas and cables, it is important to ensure that 1)monitoring animals on the ground, or covering a broader airspace over a smaller area. Omni-directional antennas areconnectors between the coaxial cable and FUNcube, and between the antenna and coaxial cable, are compatible, and best2) suited for determining species presence-absence patterns (e.g. seabirds at a colony), but not for providing directional information (e.g. departure directions of songbirds from a stopover site). Many projects may wish to utilize one or more antenna types depending on their research questionsthe impedance rating of all cables and connectors is the same.  FUNcubes have a 50 ohm input impedance rating.  Therefore, to minimize signal loss all connectors and cables leading from the FUNcube to the antennas should be rated for 50 ohm.

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    Coax Cables: 

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    TWS/LMR-400 - similar to RG213, but higher quality (stronger weather/sun resistance) coating. Best for longer-term installations and long cable length. Most expensive. Manufacture can suggest which cable is better - LMR is usually cheaper. Has the lowest loss, especially over long distances.

    Connectors. When ordering antennas and cables, it is important to ensure that 1) connectors between the coaxial cable and FUNcube, and between the antenna and coaxial cable, are compatible, and 2) the impedance rating of all cables and connectors is the same.  FUNcubes have a 50 ohm input impedance rating.  Therefore, to minimize signal loss all connectors and cables leading from the FUNcube to the antennas should be rated for 50 ohm.

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    Connecting to a FUNcube/RTL-SDR Dongle:

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     Mounting Antenna:

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    • Maple Leaf Communications - info@mapleleafcom.com will supply 9-element, and/or J-pole (mono/omni) antenna and cables
    • Economy 2-way distributing in the US - info@econ2way.com will supply 9-element antenna and cables together for about $500 each. -tends to have the best or comparable prices - used heavily by US partners and are familiar with the setup. Good customer service.  
    • Digikey.ca- www.digikey.ca - www.digikey.com  
    • Hutton Communication- 5228 Everest Dr. Mississauga, ON. L4W2R4 416-255-6063 - Canada - also has US distributors.  
    • Omni/Mono Antenna- Bob Morton Maple Leaf Communications - bobm@mapleleafcom.com

    Version from 15:08, 21 Sep 2016

    This revision modified by stuart (Ban)

    ...

    Antenna Types. A variety of antenna options exist for VHF telemetry. To date, we have used 9-element and 5-element Yagi directional antennas, and single-pole omni-directional antennas. 9-element Yagis have a long, narrow detection range, whereas 3, 5, or 6-element Yagis have a relatively shorter and wider detection range.  Omni-directional antennas are best suited for determining species presence-absence patterns (e.g. seabirds at a colony), but not for providing directional information (e.g. departure directions of songbirds from a stopover site).

    Coax Cables: 

    Connectors. When ordering antennas and cables, it is important to ensure that 1) connectors between the coaxial cable and FUNcube, and between the antenna and coaxial cable, are compatible, and 2) the impedance rating of all cables and connectors is the same.  FUNcubes have a 50 ohm input impedance rating.  Therefore, to minimize signal loss all connectors and cables leading from the FUNcube to the antennas should be rated for 50 ohm.

    ...

    Omni/Mono Antenna- Bob Morton Maple Leaf Communications - bobm@mapleleafcom.com

    Version as of 21:17, 25 Feb 2019

    This revision modified by stuart (Ban)

    ...

    Antenna Types:

    A variety of antenna options exist for VHF telemetry. To date, collaborators have used 9, 6, 5 and 3-element yyagi directional antennas, and single-pole omni-, j-pole antennas. 9-element Yagis have a long, very narrow detection range, whereas 3, 5, or 6-element Yagis have a relatively shorter and wider detection range.Generally 9-element antenna are great for creating long, linear invisible fences to detect passing animals or to detect flights, or departures of animals from specifici sites. Smaller 6, 5, or 3-element antenna are better for monitoring animals on the ground, or covering a broader airspace over a smaller area. Omni-directional antennas are best suited for determining species presence-absence patterns (e.g. seabirds at a colony), but not for providing directional information (e.g. departure directions of songbirds from a stopover site). Many projects may wish to utilize one or more antenna types depending on their research questions.

    ...

    Coax Cables: 

    ...

    TWS/LMR-400 - similar to RG213, but higher quality (stronger weather/sun resistance) coating. Best for longer-term installations and long cable length. Most expensive. Manufacture can suggest which cable is better - LMR is usually cheaper. Has the lowest loss, especially over long distances.

    Connectors. When ordering antennas and cables, it is important to ensure that 1) connectors between the coaxial cable and FUNcube, and between the antenna and coaxial cable, are compatible, and 2) the impedance rating of all cables and connectors is the same.  FUNcubes have a 50 ohm input impedance rating.  Therefore, to minimize signal loss all connectors and cables leading from the FUNcube to the antennas should be rated for 50 ohm.

    ...

    Connecting to a FUNcube/RTL-SDR Dongle:

    ...

    Mounting Antenna:

    ...

    • Maple Leaf Communications - info@mapleleafcom.com will supply 9-element, and/or J-pole (mono/omni) antenna and cables
    • Economy 2-way distributing in the US - info@econ2way.com will supply 9-element antenna and cables together for about $500 each. -tends to have the best or comparable prices - used heavily by US partners and are familiar with the setup. Good customer service.
    • Digikey.ca- www.digikey.ca - www.digikey.com
    • Hutton Communication- 5228 Everest Dr. Mississauga, ON. L4W2R4 416-255-6063 - Canada - also has US distributors.

     
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