Posts by dg0opk

  • FT8 Monitor QRV for testing

    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

  • FT8 Monitor QRV for testing

    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

  • 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

  • Looking for LNB

    Hallo...


    JUST A NOTE ABOUT !!!


    because of the QO-100 activity now I found more and more of "resellers" with some dubios work and thats why it is needed to put a warning on my homepage... !!!


    MAYBE IT IS NOT A GOOD STYLE .. NOT TO GIVE THE SOURCE OF THERE INFORMATIONS AND DESIGNS and maybe they should put some serious measurement results if they have REALLY verified there work...???


    http://www.dg0opk.darc.de/Octagon_LNB_mod_March2017.html


    I have DONE.... and the references to G0MRF and ZS6BTE are written inside the article and all is OPEN for PRIVATE USE (HAMRADIO) and not for COMMERCIAL PURPOSES!


    THANKS de Michael dg0opk

  • LNB: Current Usable Ones with PLL for NB Transponder

    Hallo...


    i got an similar model today...


    https://www.ebay.de/itm/AX-Bla…a66b7f:g:WyQAAOSwg31ahPWo


    2 x RDA3565S , one crystal (27MHz??) maybe below the PCB... no seen if open...


    GOOD RECEPTION on 26 EAST BADR4 11996 > 9dB ...a bit more sig then the OTSLO 1208/1301


    look nice at first sight...


    EDIT:

    Testet the unmodified LNB on 10492 H (ES Hail2) ,11196 H and 12168V (BADR4)

    nice signal levels on my 85cm Dish... 0.2-0.4dB better then the old OTSLO 1208/1301


    OK for the MONEY...!


    73 de dg0opk

  • Looking for LNB

    Hallo...


    difficult to get the old (working models).... they are out of market
    i you have luck you get one ?


    made some tests on newer models.... mostly NEGATIVE... some wobbling!

    OLD MODELS WORKING GOOD AND TESTET ALSO WITH TCXO INSIDE:


    OCTAGON OSLO CHARGE1208/1301 RDA3650M TCXO 26MHz (TXC-7N) LO:9388,9

    OCTAGON OTSLO CHARGE 1208/1301/1306 RDA3565ES TCXO 27MHZ (D75F) LO:9750 (THE BEST ONE)


    all newer MODELS looking not so good...


    maybe some progess in future...???


    73 de Michael dg0opk

  • Newbie needs advice on patch feed

    Hallo....


    this is the simple patch i used for my tests until now... (K3TZ design)...

    build in a 60cm PF Dish and working nice...


    can read my ssb signal with 0.5W (easy) and worked on FT8 in QSO down to 0.1W tested decodes 0.05 and 0.025W (QRA64) .... so i think not much is wrong here in this design...


    EASY and very CHEAP to build!


    73 de michael dg0opk

  • Digital Tests on NB Transponder

    Hallo...


    i got an SWL report from ON7KGK on my QRP tests yesterday evening after my QSO with DK2RO... (see attached)


    MY TX:

    LIMESDR + GNURADIO GRAPH (by DG0OPK) + AUDIO via PULSEAUDIO LOOP from WSJTX 2.0.0 ...to GNURADIO


    Amplifier(?):

    MMIC DRIVER max.10dBm + DL2AM DRIVER 0.5W max.. LIMESDR TX POWER was set to 40dB (max is 60dB)...


    TX-ANTENNA: PF DISH 60cm , simple patch feed


    NO GPS LOCK !


    BTW: i decoded the same on my monitoring RX...

  • WB TRANSPONDER TESTS

    Hallo...


    today i made a comparision of WB-SIGNAL with the BATC Wideband Monitor with TT-S2 1600 and 85cm DISH + OCTAGON LNB


    DATV BEACON signal was set down by 3dB since yesterday... so nearly 7dB on BATC Monitor. (before it was >10dB at the WB Monitor with an 1.3m DISH).


    So i think... 85cm is big enough for receiving DATV ...

    It looks very good calculatet from AMSAT before... TNX


    73 de dg0opk

  • WB TRANSPONDER TESTS

    Hallo and GM ...


    tnx for the replies...


    short more information about...


    The streamreader.dll is used by many programs in the satellites monitoring community and works with many different cards.


    programs:

    Crazyscan, IQ-Monitor or EBS pro... maybe some more others.


    the streamreder.dll is the interface between the hard and software and can be configured via an ini file. (streamreader.ini)


    In the streamreader.ini is a section with the following entries..


    ;! Change IF range (default 950-2150MHz) 940 - 2160 MHz

    IFStart=700

    IFStop=2150

    ;LNBMid=6000

    ;LNBStk=21000


    I have removed the comments before and set IF start and IF stop and set IFStart to 700.

    But i dont know if all versions of streamreader.dll support this.

    Maybe you have to change the the streamreader.dll file in the install directory of your software.


    I have testet TT-S2 1600 and TBS-6522 with EBS Pro and IQ-Monitor.


    EDIT and additional note:

    The TV cards normally only support WIDEBAND Symbolrates > 1000 if you have luck.... you can also lock SR below 1000 but it depends on the quality of signal and the chip inside the TV card.


    to all: have a nice sunday... nice WX so no time for hamradio today...


    73 de dg0opk

  • Promo video on WB active

    Hallo...


    made today an other TEST without external MIXER to shift the frequency....


    It works without additional Hardware on the TBS6522 with changed parameters in streamreader.ini ...to start at 700MHz.


    So the TBS6522 can be used below 950MHz.


    ...good sig on a 60cm DISH (not optimized..only for test) with OCTAGON TWIN LNB.. S/N 6.8dB on DATV BEACON


    UPDATE:

    it also works with Technotrend TT-S2 1600 S/N from TV-card given 7.8dB


    73 de DG0OPK