FT8 Monitor QRV for testing

  • Hallo ...

    for testing purposes i put on an FT8 Monitor on QO-100 to 10489.600 to spot to PSK31reporter.

    Because it is not possible until now to direct spot on 3cm ...so i used 23cm 1296.6 MHz instead.


    rx results on QO-100 can be seen here ... (last 12hours)


    https://pskreporter.info/pskma…band=480000000-1400000000


    RX setup:

    85cm TVDISH (3LNB 13/19,2 and 26 east) OCTAGON OTSLO(TCXO) + ADALM PLUTO (TCXO) or RTL-SDR(TCXO) , WSJTX 2.01


    have an nice EASTER TIME


    73 de Michael dg0opk

  • NOTE the DELAY of SPOTTING is ABOUT 5mins... so be slow if you use different setups for testing ...

    @ PA1SDB is 1dB at 20.april 2019 20.33ut so same margin of 15 or more dB?

    i dont know....


    73 & GN

  • Note2:

    you need a clean and stable tx signal to decode FT8 .... this is very narrowband mode....


    so on RX LNB with low noise TCXO and/or SW correction (better both to use) or GPS locked with low JITTER and LOW NOISE is recommended ... (that is difficult) for a low budget... station


    on TX Side you have to use the same ... TX with tcxo on all components or GPS locked...


    i am freerunning on all my systems with TCXO inside in moment ..no GPS lock ...it is possible (and it is much work to modify all components ) and GPS is not installed until now....!


    73 de dg0opk

  • Hallo ...


    after some break my QO-100 FT8 (and now also FT4 monitor) is online again for testing purposes


    It uses 2 instances of WSJTX 2.1.0 one for FT4 and the other FT8 with my GNURADIO dual channel receiver (only one qrg in use in the moment that means both channels have same QRG) . SIMPLE RX is an rtl-sdr with TCXO.

    Computer is an small MINIX NEO Z83-U to save some energy... :)


    Rx dish is 120cm , LNB is TWIN LNB with TCXO mod no other stabilisation method is used


    Station Reports and signal levels can be seen in the PSK 31reporter and the received stations were spottet to 23cm because PSK31reporter has no 10GHz possiblity until now.


    https://pskreporter.info/pskma…band=480000000-1400000000


    NOTE:

    sometimes the reports are declared as unknown frequency so maybe they can be seen on this link


    https://pskreporter.info/pskma…llsign=dg0opk&band=0-4000


    EDIT ... and picture of FT8 QRP test in october 2019 attached


    please try also to use low power i could decode my sigs with 3dBm (2mW) transmitted on 120cm ...

    6 to 7dBm works also ok with a 60cm TX DISH


    73 de dg0opk