Posts by dg0opk

    Hallo ...


    found an interesting s-band filter on ebay....


    it looks you can use port1 for QO-100 and it needs no retuning maybe other uses are possible (if needed)


    Edit:

    it is an DUPLEX filter ...PORT1 is 2410 and below , PORT2 2470 and higher....

    ONLY 1 port is need for QO-100 the other can be open or terminated


    so maybe other purposes are possible ?


    https://www.ebay.com/itm/RF-Di…f0a751:g:a1IAAOxyLN9Sf4dK


    delivery was with measurement datasheet (see attachement) but not verified if ok


    EDIT2:
    an measurement shows an insertion loss of about 1.5dB !! that is a bit to much for use on TX and on higher POWER, if you resolder the other part of the duplexfilter it goes down maybe to 1dB.... SO NOT AS GOOD as HOPED ..!



    73 de dg0opk

    dd9fj


    meine Firmware ist alt V0.29 ...zweiter CPU Kern ist nicht aktiviert ... da bisher nicht gebraucht auch nicht bei DATV...

    alles auf USB 2.0 mehr braucht es normal nicht bei korrekter Installation....


    Keine Ahnung wo die Nebaussendung herkommt.... checke vielleicht mal deine Signalqualität auf der REF von 40MHz (GPSDO) .Bitte die 40MHz auch mal im Nahbereich (2400/27Mhz) mit dem SPEKI anschauen.... vielleicht kommt es dort daher....


    73 de DG0OPK

    Hallo zusammen...


    kurze Anmwerkung noch zum Thema:


    (Nicht nur) wenn man ein SDR setup benutzt ist es auf jedenfall erforderlich am TX-Ausgang ein hochwertiges CAVITY Filter zu verwenden um die Breitband Nebenaussendungen (unterhalb und oberhalb) zu unterdrücken.


    Alle anderen Nebenaussendungen im Passband lassen sich bei korrekter Funktion des SDR Steuersenders (vom hardwarebedingten Phasenrauschen mal abgesehn) per Software und mit entsprechender Kalibrierung korrigieren...

    Die Mobilfunker machen ja auch nichts anderes ...;)


    73 de Michael dg0opk

    Hallo zusammen...


    dd9fj ...

    ich habe folgende Fragen zur Thematik, da der Pluto ja doch Spektral etwas besser als der LIMESDR aufgestellt ist.


    Welche Firmware hat der ADAPLM PLUTO und wurde dieser mit einem anderen REF Oszillator modifiziert?

    Wurden die automatischen Kalibriereinstellungen oder andere I/Q Einstellungen verändert?


    Ich verwende FW 0.29 und seit kurzem die SDR Konsole 3.0.13 habe ähnliches an meinem Signal nicht beobachten können.

    Mein Pluto ist "out of the box" nur mit Frequenzerweiterung 70-6000Mhz und 5€ TCXO MOD.


    Danke im Voraus ...


    73 de Michael dg0opk

    G0MJW ...

    i know why you prefer this solution.... :)


    IT WORKS ON NARROW AND WIDEBAND ... (look at FUNKAMATEUR MAGAZINE 12/2018) ... an article was made about ...but for GNURADIO and LINUX...


    And additiontional dont forget the LIMESDRs ...SAME SETUP other SDR MODULE... and DONT FORGET THE FILTERS...

    IN DUBUS 04/2018 you can see another solution by W7FU with ETTUS B210


    73 de Michael dg0opk

    Hi Adrian...


    your question ist not easy to answer....


    If you are hard ...you can modify everything you want...!


    BUT ... YOU NEED MONEY,LOT OF TIME AND A BIT OF LUCK....


    Thats my short expieriences about in 29 years with hamradio licence...


    THINK about ... if you want to go the STONY WAY.... GOOD LUCK


    73 de michael dg0opk

    Hallo everyone....


    i made a short PROMOTION VIDEO for QO-100 (retransmitting NB TP via WB TP in DATV H265)


    the testing setup by dg0opk was 120cmDishes on RX/TX has given me the time and possibilty to transmit all live you can see... in DATV H265 1280x720!!


    VIDEO is on on YOUTUBE ....



    120cm RX and TX for WB and NB TP use...


    some more information is given in the info...of the YT video


    many thanks to all (especially to background workers in AMSAT-DL to make it possible...)


    73 de Michael DG0OPK

    Hallo everyone....


    in the picture attached you can see the difference in performance of the old Conner Winfield D75F (2017 and before - upper part of picture) and the D75F oscillators are delivered after around mid/end of 2017 and later (lower part) ....


    Measurement was done in MAY2019 on a 35cm DISH with the QO-100 lower BEACON as reference...


    So i think that are no questions about anymore and i can confirm all the result from David G0MRF...


    I am happy that i got some old ones in 2017 for my OTSLO LNBs and found a replacement source for future (but much more expensive)


    73 de Michael dg0opk

    Hallo ....


    after upgrading to VARA Modem 3.1.1 and a new (faster computer) i got the following results on a first test with my (non GPS locked setup)


    Data Sent: 102384Bytes

    Time: 8min40

    Thruput: 11768Bytes/min


    looks ok for an SSB channel.... with 3kHz BW ....(nice!)


    Peak Datarate: 3500bps


    setup using:

    TCXO LNB with software driftcorrection on QO-100 BEACON (SDRConsole), ADALM PLUTO (TCXO MOD) in FULLDUPLEXMODE, SDR Console3.0.11 ,VirtualAudio to Vara Modem, RX/TX Switch ... VOX Controlled by SDRConsole


    73 de dg0opk

    @ PA3FYM

    stability can maybe corrected (if needed) via software tools ....


    phase noise is build inside the oscillator....AND


    the right LNB is to use withthe GOOD CHIPs for low NOISE ...


    maybe the RDA chip in the old octagons or other LNBs


    so the RX results will maybe very good...


    73 de dg0opk

    Hallo ...


    i got some measurement result for the alternative 27MHz TCXOs


    DRIFT (ppm) and PHASE noise attached....


    if anyone need .... as replacement for the "bad D75F" delivered after mid of 2017...let me know...


    dg0opk@darc.de


    ADDITIONAL INFO ABOUT:


    PLEASE ASK THE RESELLERS in HB9 land and on ebay....


    if they have verified the products they sell with the given information on my homepage in 2017 .... and if they asked me before about?


    THEY HAVE NOT DONE... until now !!


    so please ask again ... to me directly if you need an good working and stable LNB for QO-100


    73 de michael dg0opk

    Hallo...


    good news about SDR ANGEL ... from 18july2019


    experimental DVB-S2 support!


    https://github.com/f4exb/sdrangel/releases/tag/v4.11.1


    INFO:

    DATV demod: experimental DVB-S2 support

    DVB-S2 standard support using the "work" branch of leansdr (https://github.com/pabr/leansdr/tree/work) supposedly still experimental. This works reasonably well though. You may need to move the controls a bit to get a lock.


    i have found today ..but not tested .. very...interesting if it works


    73 de Michael dg0opk

    Hallo ...


    after some time ....the CAT is out of the BAG ...

    the D75F dont work anymore like before ...


    the old ones from 2017 are GREAT ...


    but i have a new source for 27MHz TCXOs with good quality...they are in test now...

    please mail me if you have interest (but they are more expensive but ok)


    email: dg0opk@darc.de


    73 de michael

    DD4YR

    hallo robert ... the differences between bad and good weather are not very much ...

    so you have an loss or inaccurary of maybe +-0.3dB ...if the dish is correct aligned..


    maybe some times in the summer we have some thunderstorm with rainscatter...

    but thats an on other game to play... HI


    73 de dg0opk