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2.4 GHz contact over mountains

Discussion in 'VHF/UHF - 50Mhz and Beyond' started by VK7HH, Aug 4, 2019.

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  1. VK7HH

    VK7HH Ham Member QRZ Page

    Who said that microwaves were line of sight only!

    A rainy day today, so I decided to try from under the roof of my shed. As you can see, not the best path but still strong signals on FT8.

    SSB will be possible once the other station gets a preamp.

     
    AI3V likes this.
  2. VK7HH

    VK7HH Ham Member QRZ Page

    Another video!
    More testing on 3.4 GHz using a WA5VJB PCB antenna as a grid feed

     
    AI3V likes this.
  3. AI3V

    AI3V Ham Member QRZ Page

    Outstanding!

    Have you read this:

    http://www.w1ghz.org/antbook/chap4.pdf

    https://www.qsl.net/n1bwt/app-6a.pdf


    On my 3456 mhz system I found that a ordinary waveguide to coax transition piece provided the best gain, I had a rather shallow dish a bit less than a meter in diameter (it was a repurposed light reflector)

    You are shooting for a feed beamwidth 10db down at the edges of the reflector.

    Rege
     
  4. KC9SGV

    KC9SGV Ham Member QRZ Page

    Maybe you could get into the QO-100 GEO sat with FT8.
    It is below the horizon for the USA, but maybe tropo scatter and knife edge propagation could help.

    If successful, you should see your trace on the WebSDR waterfall.
    Uplink is in the 2.4 GHz band.
    Downlink is in the 10.4 GHz band or WebSDR.
    Stay within the beacons !
    The sat sits very high at 36000 km above the equator, at 26 deg east.
    Could be a new world ham UHF distance record...
    See the beacons and downlink traces on the waterfall here:

    https://eshail.batc.org.uk/nb/

    Aim the dish:
    Look for 25.9 deg east, ES

    https://www.dishpointer.com
     
    Last edited: Aug 28, 2019
  5. KC9SGV

    KC9SGV Ham Member QRZ Page

    Band plan for QO-100 uplink.
     

    Attached Files:

  6. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    You never tried waveguide to binding post/banana plug transitions?

    At HP, we used to joke about those and then someone drafted a drawing of how to build one.:)
     
  7. VK7HH

    VK7HH Ham Member QRZ Page

    Hmm no. It's -30 degrees below the horizon here in VK!!
    We'd love a geostationary satellite that has a footprint here though
     
  8. VK7HH

    VK7HH Ham Member QRZ Page

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