Posts by dg0opk

    Hallo ...


    i will try to let run my rx monitor on FT4 and FT8...


    received spots are sent with 23cm frequency marking (so not all spotted in PSK31reporter


    LINK last 12hours...


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


    Additional NOTE


    some station are marked with unknown frequency in PSK 31 reporter


    so they can not be seen with 23cm filter


    maybe it is time to open PSK31reporter to 3cm (10.368/10.489 MHz)


    73 de dg0opk

    Hallo Robert and Thomas..

    tnx for your response ....


    but note ... we are not using an terrestrical radio path... we are using free space propagation with LOS (line of sight) so it is very interesting to monitor the changes of an LOS path which maybe only depends on some changes in the ionosphere at 10GHz ... ??

    never though and seen before that there are changes in path loss ...


    yes they are changes on heavy rain on bad weather conditions with thunderstorms (rainscatter) but changes on clear sky?

    (this is what i mean as a goal)


    Very interesting to hear someting about

    73 de dg0opk

    Hallo...

    got today some more level now... also with snowfall on the QTH....

    9.6dB is reached again on 120cm ...nothing was changed on the setup ....


    maybe the wheather is going good now in DOHA... ?? again


    @ DH2VA

    and maybe we have really some "ionospheric scintillation" depending on the local position of the receivers?

    i dont know... but maybe it is interesting to watch about this...


    73 de dg0opk

    Hallo all...

    after checking my receiving systems this weekend i could detect an loss of MER of the DATV Beacon on 10492.5 ...

    it is about 0.3-0.5dB weaker thank in the weeks and the other times before


    the effect is on all my 3 receiving systems nearly the same but maybe some detuning of strong winds ???

    level with empty tranponder (only beacon seen)


    85cm LNB at Center MER 7.2 (before 7.8dB - sometimes over 8dB)

    85cm LNB 7degrees offset MER 6.5 (before 7.2dB)

    120cm Offset MER 9.3 (before 9.6-9.8dB)


    Can anyone confirm?


    EDIT:

    the TV Signals from BADR 4 12168 V ,11996 H are unchanged and reaching 11.5 to 12 dB on my 120cm


    73 de Michael dg0opk

    DL9SEC


    thank your for information but this is not my application... and the problem


    there are several other reasons and applications which need more than one NETWORK DEVICE...

    I think there is a problem maybe in the software


    (like i said before the binding of IP adresses to the devices have to recheckt)


    73 de dg0opk

    Hallo ...

    thank your for all the informations about here..


    i have same problem but i am using always more than one network card in the systems. They can not deactivatet easily.

    UDP is only working on local via loopback ip.


    Maybe anyone can give the information to F6DZP that he can look in the UDP bindings if there is more than network device.

    I have seen in past also other applications with this problem.


    More than one network device is common application in many systems.


    Nice sunday around

    73 de dg0opk

    Hallo ....

    interesting informations from heiseshow 13 feb 2020 on YT

    about QO-100 and some background (relly good informations about the NON COMMERCIAL PROJECT)



    in german lanuage ... maybe a double post .... so delete if you want...


    73 de dg0opk

    hmmh....


    after thinking about....


    MAYBE AN IDEA .... came into my brain....


    EMERGENCY BEACON PROJECT in WSPR/WSJTX (maybe modified protocoll) or OTHER WEAK SIGNAL MODE ... battery powered small transmitter with patch antenna 6dBi


    like the COSPAS/SARSAT commercial project ...


    CAN BE RECEIVED BY SOME EMERGENCY MONITORING STATIONS in the footprint RUNNING 24/7


    ???? WHAT DO YO THINK ????


    73 de dg0opk

    Hallo agn...


    thank you for all informations...


    I am working many years with wsjt...,wsjtx ... and the timing is mostly the GOAL to get an decode... !


    And additionally i will give some information about LINUX systems...


    There is an tool on the newer versions of LINUX ...called CHRONY as replacement for NTP ...

    It can also make a time correction in positive and negative direction controlled by an ini-File


    I am using this since some years on my ARM-mini computer monitoring systems with GNURADIO RX and RTL-SDR to correct the time/sdr delay.


    73 de dg0opk

    Hallo...


    i am using MEINBERG NTP for Win10


    https://www.meinbergglobal.com/english/sw/ntp.htm


    it works like a charm without any correction needed until now (also with SDR)

    but interesting to see that there are solutions out to correct the time offset (SDR latency + GEOSAT delay)


    DK8KW ...

    What helped for me is a little software that W9MDB has published on his qrz.com page. It is called TimeFudge (https://www.dropbox.com/s/b39x…imeFudgeSetup1_3.exe?dl=1). With this software you can adjust your computer clock in 0.01 seconds steps plus and minus. I have been succesful in reaching FT4 and FT8 stations by playing around with this parameter for a while.


    TNX for Info


    BTW:

    i made a number of qsos without problems ... and i can decode my signal in FT8/FT4 every time with 2mW with TX 120cm Dish RX 85/70cm Dish and 8mW TX 60cm and RX 85cm... Level Range is then -12...-17dB WSJTX Scale

    so no QRO is needed for FT8/4 ... level over 0dB is QRO in my opinion...


    73 de DG0OPK

    Hallo Darko...


    i hope i understand your question correctly....


    but after my information a small device ...his name is ADALM PLUTO can do this...


    F5OEO Software DATV(SDR) with WEB-Controller by M0DTS has made a special firmware for the TOY to use the device via IP ETHERNET STREAM ...


    They use ffmpeg in the Pluto ARM SOC (single/dual core ARMv7) as receiver to send it via RF... the installation procedure for the Firmware is very easy and done in 5minutes ... look for this on the infos are given on ANALOG DEVICES hompage


    frequency range of the Pluto is 70-6000MHZ


    output power tuneable -50 to 0dBm (maybe...depends on the device)


    But note to all readers:

    THINK ON THE OPEN SOURCE IDEA of LINUX and HAMRADIO and the AMSAT RULES ...

    some friends use this tools and ideas as the BUSINESS MODEL !


    73 de dg0opk

    Hallo Peter...


    many thanks for information...


    are there any measurement results regarding phase noise and/or iq-balance especially in digtal modes maybe datv 8psk or higer mode and please information about the correct device data and specification ... maybe datasheet and the device type?


    Many thanks


    73 de Michael dg0opk

    Hallo ...


    just a note about the plutosdr 40MHz tcxo from abracon...


    they are back in stock now after sold out in october 2019

    (after my article in Funkamteur 10/2019)...


    (but not buyed by me .. got one after this from a hamradio friend after that for my personal use)


    actual Price: 3.50€ for a single one


    https://www.mouser.de/ProductD…oHw6KB4DoXIzKXs5teA%3D%3D


    73 and happy holidays and merry christmas around

    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