Using FT8 to demonstrate Antenna Orientations

Discussion in 'Amateur Radio News' started by KM9G, Oct 6, 2021.

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  1. W1YW

    W1YW Ham Member QRZ Page

    Co-ool!
     
  2. N5SMO

    N5SMO Premium Subscriber QRZ Page

    The Sig report in FT8 takes into account the total received bandwidth. Put a narrow filter over a signal on the bandscope and see the results.
     
    W0PV likes this.
  3. K0UO

    K0UO Platinum Subscriber Platinum Subscriber QRZ Page

    Most of my friends on FT8 are running 1500 watts with good antennas

    And that's exactly why I don't work use FT8 at anymore.
     
    W1YW likes this.
  4. WD4ELG

    WD4ELG Ham Member QRZ Page

    Steve, please let's not go down the "weak signal versus low power debate" on FT8. I would much rather hear more details about your rhombic farm and listen to some recordings of what you hear with all that wire.

    One of the Ham Radio commandments is "Thou shalt not covet thy fellow ham's antenna farm"

    Well, I have sinned because I am green with envy!
     
  5. WA4NID

    WA4NID Ham Member QRZ Page

    ok I'd like to thank KM9G, you have showed how a bunch of antennas can get about the same results!
    It is a useful result. I disagree about the significance of the "areas" in your results since the occurrence
    of data is doubtless much influenced by propagation, random reception, etc. I love it that we can see
    from your experiments that different antennas give similar results, it says to us "put up an antenna,
    any type, and have fun!"
     
  6. KQ1V

    KQ1V Ham Member QRZ Page

    Oh boy, yet another digital mode.
     
  7. N3RYB

    N3RYB Premium Subscriber QRZ Page

    This post has less info than a FT8 QSO.
     
    M0TTQ and W3PX like this.
  8. KQ1V

    KQ1V Ham Member QRZ Page

    5 9 good luck in the contest.
     
    WD4ELG and N3RYB like this.
  9. NQ6B

    NQ6B Ham Member QRZ Page

    I haven't read all 13 pages of comments but some suggest using a Flex radio with a slice connected to each antenna and the output going to two instances of WSJT-X running simultaneously on the same computer. I've used this approach for a couple years and it's been very helpful. You can model your antennas all you want but there's nothing like quantitative measurements of your actual antennas, with all the surrounding hillsides, trees, buildings, etc.

    WSPR would be ideal for this but there is a lot more data available on FT8.

    If you're interested here's my setup:

    I have an SDRPlay Duo, two identical receivers. I connect one antenna to each receiver, run two instances of SDRUno software (SDRPlay's receiver) and run the outputs of each through virtual audio cables to two instances of FT8. In 24 hours on 20 or 40 meters I'll have 20K data points from 2000-3000 stations. I copy off the ALL.TXT files from the WSJT-X instances and run the data through some Python software that I wrote, which breaks the results down by distance and azimuth (since I know the station's grid). I also plot the results on an azimuthal map (downloaded from NS6T).
     
    W0PV and M0TTQ like this.
  10. KK1LL

    KK1LL XML Subscriber QRZ Page

    Admittedly, I did not read any of this thread, but I am going to comment anyway.

    I have a dipole, sloper, and vertical. The performance of each of these antennas depends on many variables that change constantly.
    What one antenna does or does not do changes constantly, as well as which antenna is "best" and "worst".

    IMO whatever information gathered in these "experiments" will be irrelevant in a couple days, if not a couple hours.

    -Brad
     
    WD4ELG likes this.

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