Posts by ON7NDR


    Test ik1hgi to receive with a regular rtlsdr in mode dvbt sr500 with version 2k5 rx

    SV8RV dennis thanks for the help on transmitting the signal.

    in attachment the picture from received SV8RV-3 call

    tony also thanks you very much for your help sv8rv

    also sv1bds thank you for your software

    73 de on7ndr

    Hello George,

    This afternoon tony ik1hgi and me compiled the gr-iio succesfully for the pluto and did a test in transmitting and simultan receiving on xubuntu 18.04

    it works , but signal was going up and down....

    don't know what bitrate and video should be used for 500 dvbt

    attached images tx and rx ....

    73 nico and tony ik1hgi

    on the left rx in vlc image on the right obs as video/audio source behind running as transceiver

    hi georges,

    i have noticed that the decoding was more quickly than dvbs2 decoding, we must wait longer to see the image's on dvbs2

    yesterday tony ik1hgi was trying with his pluto to make the tx2 python run.

    we had iio error , iio module swig not correct?

    what depencies must be installed for swig and iio for adalm pluto

    where must ' cmake -DCMAKE_INSTALL_PREFIX=/usr .' be inserted ?

    git clone
    cd libiio
    cmake -DCMAKE_INSTALL_PREFIX=/usr .   ( is this correct????? )
    make sudo make install
    cd ..

    git clone
    cd libad9361-iio
    cmake -DCMAKE_INSTALL_PREFIX=/usr .      (this also command?)
    make sudo make install
    cd ..

    can sv8rv transmit also on 13.00 hr to see if ik1hgi can decode with rx version 2K5 please.....

    Hello george ,

    many thanks for your software.

    version dvbt rx 2K5 works fine to decode 500 symbolrate dvbt

    attached are the images from sv8rv , thanks dennis for the transmission

    also you have done a great job


    73 .......

    decoding was very fast done via udp port 5555 on VLC in ubuntu 18

    simple command : python

    running fine with rtlsdr 2832u

    Hello george ,

    i have version 2K5 running with regular rtlsdr , will try to decode it today

    Thanks for your effort on rb dvbt test gnuradio

    when i see a decoded image ,i will post the video image here

    73 nico

    george , no luck with rx with rtlsdr on your software

    version 2.4 K was running to get any signal decoded

    ubuntu 18 and python file

    antenna is 1.2 m offset , so plenty signal enough

    had a jack server error , not started?

    also buffer error?

    but program runs ....

    the last tx version can not be run due to the iio missing module. (error)

    thanks for your work.

    would be nice to have also a variable made on the ratio and samplerate (chooser in gui)


    info my modification for a 2 x blf7g22l-130 umts for bias increasing voltage from 0.58 to 1.95 Volt .

    1. removed origininal smd 262 Ohm resistor from gate to ground in trace.

    2.added 2x 3800 ohm resistor to capacity on board

    3.voltage increased from factory 0.58v on ldmosfet2 to 1.95 v due to this modification

    4.ldmosfet running in class AB for linearity

    5.power output plus minus 50 w

    6.attached image for proper biasing and how the ldmosfetnr2 becomes active when bias is more than 1.4v and the critical 2.3 volt.

    bias higher than 2.3 volt can destroy ldmosfetnr2 (info)

    ik4idy , G0MJW : this is a info for all amateurs

    datvexpress accept only directshow windows devices that are "visible" in your sytem.

    so , after installing virtual cam (directshow) plugin for obs , datvexpress can see the camera and tx the video from obs.

    when you choose obs-audio , there will be a warning that there is no audio grabber or actualy no directshow audio element.

    if have been doing test with vb cable, voicemeeter, etc , was not working!

    yesterday i maybe found a good solution?? go to audio settings pc , recording , deactivate your normal microphone

    then activate the "stereo-mix" as standard device

    leave the playback on normal speakers.

    now open datv-express , and stereo-mix (microphone loop) will also be seen in the "live" and "audio"

    restart datvexpress and transmit video from the virtual cam and audio from "steromix" virtual system

    i is working on ic8ecf , have tx yesterday with this test.

    can someone test if the audio is good ??? please give me a respons to this message.

    just for info also, if you activate also your normal microphone , you can talk also in your tx video.

    keep stereo device standard device and microphone communicate device then..

    thank you. this message will be deleted if this is not a good simple working solution

    many thanks nico

    on7kec ,dit ziet er normaal uit ; airspy device opened > driver werkt dus

    klik op het andere kleinere venster waar al die details van de versie staan en veranderingen , kleiner scherm onderaan op de ok klikken.

    programma start dan pas op !

    wanneer programma is geladen , download mijn kleine nederlandse handleiding om verder wijs uit te geraken en te starten , het gaat niet vanzelf...

    veel chance nico…32u%20en%20amsat.pdf?dl=0

    indien het op niet lukt , kan je me mailen op >

    of eens afspreken en begeleiden via anydesk applicatie (gratis) remote desktop

    of gewoon met google chrome remote desktop control applicatie of met teamviewer....

    teamviewer is de laatste tijd niet meer goed ,indien je een licentie wil kopen , doe ik niet...

    73 nico

    zet de samplerate van airspy niet te hoog , zodanig dat je bandbreedte niet te hoog is om de smallere signalen toch nog te kunnen bekijken , zowat 3 Ms is genoeg indien dat kan , heb zelf geen airspy dongle...

    Hello all,

    Our friend miguel CT1BYM was this morning active and he did again a test in 8 PSK and also DVBS1 mode

    the software again was sdrangel and our regular rtl2832u dongle

    the 8 PSK was NOT decodable here .... but than miguel give a monster signal on our birdy in 333 ks and also 500 ks DVBS1

    he made his first tryout in DVBS 1 mode , so congratulations friend miguel

    here you have the screenshot from 333 ks , bandwith was about 500 khz (333 x 1,33)

    here is the full image SDRANGEL DVBS1 CT1BYM SR 333 kS 3/4 fec

    INFO : sdrangel is software from F4EXB :…sdrangel-4.11.0-win64.exe

    hello all , just for a info...

    today i have also done a small test with datv sdrangel 64 bit windows software for normal dvbs 1 and also other modes...

    the station was on 250 ks sr and fec 2/3 dvbs 1

    decimation was set on 1 and SR dongle was 2400000

    gain had to set to 48 before constellation was ok.

    but it works...for a normal dvbs1 station and h264 codec.

    picture was good on the small datv screen .

    g8gkq was decoded..... dvbs1... maybe 8 psk works also. will test

    Hallo , nog eens een guide /handleiding hier van mij in het nederlands.

    je moet inderdaad altijd eerst correct afstemmen met de software.

    dan onderaan midden goed blijven kijken als de sr gelijk blijft of ontspoord..

    de dunne gele fijne lijn moet zich zo goed mogelijk in het midden van de voledige gele /blauwe/oranje/ waterval bevinden.

    probeer eens een 333 ks te decoderen , gaat soms makkelijker dan het baken.

    dutch duide:…32u%20en%20amsat.pdf?dl=0

    i hope that someone can make a guide in portuguese /german/spanisch/italian/russian also....


    the official links on the other page's for dvbs-demod -gui are again working fine and no popups or redirections anymore to other url's

    thanks for solving the DNS issue ...

    73 Nico De Roo , on7ndr/ jo11sf /st-laureins belgium