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Thread: Automated DTV scanning and logging web page

  1. #51
    Join Date
    Jul 2005
    Location
    Pleasant View, TN EM66
    Posts
    4,262

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    That's a good point: antenna motion is a real killer for 8VSB reception.

    My experience is the DJI drones are pretty stable but if the antenna is wire hanging below the drone the antenna itself may not be stable.
    Doug Smith W9WI
    Pleasant View, TN EM66
    http://www.w9wi.com

  2. #52
    Join Date
    Nov 2010
    Location
    Lebanon, IN
    Posts
    100

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    A very good point, Doug. I need to monitor signal quality while flying so I can see what is going on. DTV and UHF are unstable when the antenna is in motion.
    Mike Glass N9BNN
    Lebanon, IN
    EM69

  3. #53
    Join Date
    Feb 2016
    Location
    Easton, Pennsylvania
    Posts
    28

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    I doubt if your high efficiency motors are causing interference.

    If anything, there is poor isolation between the Pi-3 and the HDHR.

    Put an aluminum plate between the two units. Then shield wrap them with heavy duty aluminum foil.
    Make sure the aluminum foil of both devices are electrically connected to a negative ground trace
    of one of the USB ports.

    Yes, your drone has to be in hover mode for the HDHR to lock to the UHF signal. If the drone is moving
    3 mph it will not lock-on.

    Two questions:

    1. What is the uplink command frequency to the drone?

    2. What is the downlink video frequency from the drone?

  4. #54
    Join Date
    Jul 2005
    Location
    Pleasant View, TN EM66
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    I'd be wary of wrapping a HDHR in foil. They run rather warm with the vents exposed & I'm pretty sure it wouldn't survive long-term with them blocked. Whether you could fly it for just a few minutes without overheating I don't know.

    They sell heat sinks for some models of Pi so I'm not entirely sure that would survive a wrapping either.

    If you can still get metal window screen that might be a reasonable alternative.
    Doug Smith W9WI
    Pleasant View, TN EM66
    http://www.w9wi.com

  5. #55
    Join Date
    Nov 2010
    Location
    Lebanon, IN
    Posts
    100

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    The uplink is 2400 MHz, the drone did not come with a camera. I purchased it strictly for DTV DX purposes.
    Mike Glass N9BNN
    Lebanon, IN
    EM69

  6. #56
    Join Date
    Jul 2005
    Location
    Springfield, Missouri
    Posts
    836

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    I hope your DTV dxing drone experiment works. Would be awesome to report some long haul tropo dx directly over your qth that your terrestrial equipment wasn't reporting.
    Jim Thomas
    Springfield, MO

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