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FT8 TEST on air "DXpedition Mode" on 6 and 7 March !

Discussion in 'Amateur Radio News' started by IW2BSF, Mar 2, 2018.

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  1. AA5AZ

    AA5AZ XML Subscriber QRZ Page


    Just to help you out, you quoted my original comment.
     
  2. AA5AZ

    AA5AZ XML Subscriber QRZ Page

    Another aspect to EmComm: Plain and simple guys, when someone doesn't know CW and the solar cycle sucks so bad SSB won't make it, FT-8 WILL MAKE IT!
     
    W4NNF likes this.
  3. KI7WL

    KI7WL Ham Member QRZ Page

    I love FT-8!
    See you on the waterfalls!
     
    WU8Y and AA5AZ like this.
  4. KP4SX

    KP4SX Subscriber QRZ Page

    Yabbut, how much good can it do for Emergency Communications?
     
  5. KI7IPX

    KI7IPX Ham Member QRZ Page

    i dont know the exact number but in the bandwidth of a single ssb conversation maybe 24 or more ft-8 contact potentials can be seen in the band activity box which is refreshed every 15 seconds. ft-8 isnt handy for rag chewing or passing amounts of info but to generate a quick list of who is on the air for possible contact via another more useful mode i for one can see the utility. setup wsjt-x, tune in to 40m and witness the amount of call signs that fly past. it can be huge
    Carl
     
    AA5AZ likes this.
  6. AA5AZ

    AA5AZ XML Subscriber QRZ Page

    Just a thought about the history of our hobby and service:

    Can you imagine the first time someone figured out how to work "phone?" They had been running CW for decades at that point and of course spark before that point.

    If you think CW guys think we are cheaters now because we do not have to learn code to get a license, what do you think they originally thought of the first phone guys? Was there a fight over a new mode called "phone?" I imagine there were guys that thought it was the end of the hobby. It was just not how they liked to communicate.

    They eventually got over it or died.
     
    WU8Y, KP4SX and KI7IPX like this.
  7. KP4SX

    KP4SX Subscriber QRZ Page

    I think everybody was excited about using voice back in those days. But lordy, it went all to hell when SSB came about :)
     
    AA5AZ, W7UUU and KI7IPX like this.
  8. LA6VQ

    LA6VQ Platinum Subscriber Platinum Subscriber QRZ Page

    Inside a standard 2,7 kHz SSB bandwidth, the 50 Hz FT8 bandwidth fits 54 signals with no overlaps, although you will probably not be able to decode all of them. FT8 and the other weaks signal modes in the WSJT-X package have powerful decoding algorithms. Therefore, the signals may overlap considerably to the extent that they can be decoded even when the signals are transmitted almost exactly on top of each other. With overlaps you can just think of a high number FT8 signals inside the 2,7 kHz SSB bandwitdht. Quite efficient, even compared to CW, although FT8 has a lower "baud rate" at comparable bandwith. However, most of us get confused trying to decode CW signals on top of or close to each other, while FT8 and the other weak signal modes are quite good at .

    Bear in mind that in standard mode, the JT65 frequencies starts 2 kHz above the FT8 frequency (e.g. FT8 @ 7,074 and JT65 @ 7,076), so it is advisable to keep your TX frequency within 2 kHz of the displayed frequency, which will allow for 40 FT8 signals with no overlap, and a much higher number of FT8 signals with overlap. Regrettably, we regularly see that FT8 signals spreads well into the JT65 frequencies, and that is not OK.

    73 de Frode LA6VQ
     
    KI7IPX, KD0NPT and AA5AZ like this.
  9. AA5AZ

    AA5AZ XML Subscriber QRZ Page

    I remember reading how they thought about SSB and you're right, the world was coming to an end! I imagine it was the same way for AM originally.
     
  10. KB4QAA

    KB4QAA XML Subscriber QRZ Page

    Umm, sure at 13 characters per exchange and no error correction and not including any callsign identification. Sheesh. Sorry, but FT modes are NOT a good choice for actual communications, i.e. Message traffic.
     

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