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Thread: Automated DTV scanning and logging web page

  1. #51
    Join Date
    Jul 2005
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    Pleasant View, TN EM66
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    4,344

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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
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    Nov 2010
    Location
    Lebanon, IN
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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
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    53

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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
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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
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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
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    Jul 2005
    Location
    Springfield, Missouri
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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

    Making FM Dxing more fun than a barrel of monkeys!

  7. #57
    Join Date
    Aug 2014
    Location
    Janesville WI
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    I've had that idea in the back of my head for a while. I thought either have a 300ohm dipole and have a bulk amount of coax or the more likely option is to do thishttps://youtu.be/tq4c86uGMmg skip to 2:25 to see the set up. But I'd try to use it on FM and record the 2mhz bandwidth.
    Janesville,WI - Sony XDR-S10HDiP & Kaito KA1103 & Insignia ND-HD01A portable 😜📻🔎📶

    FM Log - https://docs.google.com/spreadsheets...it?usp=sharing
    FM Log Map - https://www.easymapmaker.com/map/84a...2f2e84bcf806f0

  8. #58
    Join Date
    Nov 2010
    Location
    Lebanon, IN
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    My antenna on my drone is a 300 ohm dipole for UHF with a preamp that has a built in balun. It worked ok but I do better with my big dish at 30 ft than the dipole at 400 ft. It may be that DTV is hard to decode on a moving antenna.
    Mike Glass N9BNN
    Lebanon, IN
    EM69

  9. #59
    Join Date
    Apr 2015
    Location
    Champaign, IL
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    I am looking to buy an HDHR device and noticed the RabbitEars site said to stay away from HDHR4 model due to "some issues with how it reports signal levels on channels without stations actively being received". Does anyone know if a newer firmware has fixed this issue? What models are you all using for automated logging? I'm wanting to combine the tuner with a Raspberry Pi 3. Thanks for your help!
    Stan - K9SWX
    Champaign, IL
    https://www.k9swx.com

  10. #60
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    Jul 2005
    Location
    Springfield, Missouri
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    Stan, refer to this post for the models of HDHR most suited for automated DTV dxing....
    http://forums.wtfda.org/showthread.p...8785#post38785
    Jim Thomas
    Springfield, MO

    Making FM Dxing more fun than a barrel of monkeys!

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