Posts by df2et

    Hej Lars,

    to be honest I am using it under Linux only. So I cannot help with the Windows version. On Linux however it works exactly as the previous version.

    vy73 de Florian DF2ET

    Dear Ops,

    DG2YCB has released a test version of WSJT-X improved which supports full-duplex i.e. decoding of downlink signals during TX phase. This way you can control and correct your own uplink signal. Transmitted and re-received own transmissions are shown in the same color (default yellow) as on the TX page right. Its still a test version and may be buggy but Uwe and team are looking foward to feedback.

    The code can be downloaded here:…iles/WSJT-X_v2.7.0/Tests/

    The full-duplex functionality is enabled in "Decode" menu. See screenshot attached.

    vy73 de Florian DF2ET

    Hi Baris,

    alright then. I was slow in switching back to SSB and re-tuning. I think Kadri TA1D was there in SSB trying to call me in the meantime. But when I was ready he/you had switched to Turkey and I did not call :)

    But interesting that I had a QSO with a pre-compiled machine :D Nevertheless it worked perfectly. The signal was absolutely 599 with some drift as I said. I should have used a wider filter instead I guess.

    vy73 de Florian DF2ET

    Hi Baris,

    thank you for the CW QSO. Was a little drifty with a 500Hz CW filter but I managed to follow your transmission with small adjustments. Found your signal accidentially while browsing the waterfall. You were in the middle of the SSB part of the bandplan. I think if you called in the CW part 505-540 you would have had a few more callers :) The CW skimmer might have detected your there and spotted.

    vy73 de Florian DF2ET

    Dear friends,

    yesterday the multimedia beacon's content was updated. We did save some space in the lower left corner of the info page. This will be used for further content in the future. The DX Cluster filter is now available via a pop-up. I made a short demo video available on [1]. The code and changes are available on github. See [2].

    Comments and feedback welcome.

    vy73 de Florian DF2ET


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    Dear QO-100 friends,

    I set up a /p station (which probably some of you worked as SM/DF2ET/p) which includes a Nextion TFT display which is used to display operational parameters. As some hams asked for more information I decided to share the code. The core is a Raspberry Pi Pico running MicroPython reading the information from the converters using an UART interface. A second UART is used to control the display. During RX it shows date/time along with maidenhead grid locator and GPS position. Also the temperature of the TX PA is shown. During TX the display shows forward and reflected power (which does not work in my case as I have an ancient version of the up converter :-).

    The code for Pi and display can be found on github:


    The only issue to date is that a patch for the up converter firmware is needed. The reason is that the configuration parameters are sent out right after power up. At this time the Raspberry Pi Pico has not finished starting the MicroPython code yet. So I did a little patch to the firmware that adds a 2 second start-up delay. The patch can also be found on github:

    Feel free to test and use the code. Comments and improvements always welcome.

    vy73 de Florian DF2ET

    Hi folks,

    I have setup a CW-Skimmer monitoring the NB CW section of QO-100 downlink. It does have a bot function sending spots to a Telegram (read-only) group. If you want to join use the following link:

    The skimmer runs on my 70cm downlink of my station at home. For some reason it has a variing offset for the spotted QRG (still needs to be investigated). An sometimes it decodes bogus callsign at arbitraty speeds (i.e. > 30/35 wpm). But all in all it seems rather helpful to detect CW activity on the NB tpx.

    vy73 de Florian DF2ET

    Dear guys,

    this is a short how-to on how I did modify the Opticum LQP 04H LNB:

    After Octagon is currently not able to provide more PLL based LNBs to be used for SAT mode I decided to have a look at Opticum LQP 04H types. Those are also sold modified by AMSAT-DL for use with their down converter v3 (see [1]). My portable setup is also based on such a unit so I wanted to try a mod of the quad model in order to also connect an SDR stick in parallel (or a DATV SAT RX or whatever).

    This type of LNB uses the same case as the twin variant. Only the PCB seems to differ slightly. The 25MHz crystal sits right in the center on the PCB under a metal shield that can be removed by unscrewing 4 torx screws. Removing the crytal is a little tricky because it is glued to the PCB. I did this by using two soldering irons in combination with a sharp knife to lift the crystal while heating.

    Anyway the crystal came off including the pads. Not sure if that would have work properly without heat as there are two traces nearby that could easily be damaged from hard mechanical force. The picture above shows the opened LNB with crystal removed.

    In this variant I did not cut off one of the IF outputs to feed the reference but instead built a low pass filter into one of the outputs in order to be able to use all 4 outputs. In this case I chose the connector at the very back of the LNB. The printed inductance was cut as a 2u2 coil inserted. This is the component at the bottom on the following picture.

    Above the IF trace feeding the output at the very back there seem to be a “patch panel” of unused pads. So I did mount a 120pF capacitor and a 330nH coil from the IF trace to those pads. The reference frequency is then using a short thin wire connected to one of the pins of the RT340 where the original 25 MHz crystal was connected. It is the third pin counted from the corner of the chip. The wire is soldered to a small via located just in front of that pin. You may need to remove some of the solder stop paint before.

    Now you can feed a 25Mhz (or other arbitrary offsets) into the back most connector while using it as an output. I.e. connect the WB port of the AMSAT-DL down converter here. The other 3 ports can be used as normal outputs (H/V depending on the voltage fed).


    vy73 de Florian DF2ET

    Hi folks,

    last night it happened. We were able to pick up the first (CW) signals from Felix on the Georg-von-Neumayer station operating as DP0GVN in Antarctica. After some preparations we observed a really ufb signal from IB59. A short video can be found in my Tweet:

    A neat little pile-up in CW followed after we completed the first QSO.

    A little while later we wittnessed the first contacts in SSB. This time Charly DK3ZL currently operating as V55QO in Namibia was the lucky one to have the first QSO. Felix then returned around 2200z for some more SSB operation. This time he was facing a really large pile-up and after ~ 1 hour he had like 100 QSOs in the log. During the operation you could see the big smile in his face while listening to his answers in split-operation.

    Felix is expected to stay in Antarctica for another few weeks. So hopefully more OMs and YLs will be lucky to catch him on SAT.

    vy73 de Florian DF2ET

    Hi Heiner,

    we did ~ 50 QSOs with the special callsign on Sunday. Will provide the .adif file, so that all those guys can get a proper QSL card.

    vy73 de Florian DF2ET

    Switching off complete power supply sometimes will help. I have had similar problems with old A version. After update/repair to version B this problem seems to be solved.

    Switching power on and off did not help in this case. My unit has been updated/reparied to model B earlier this year. So this obviously also happens to model B units ... :(

    Hi Ed,

    tnx for your support. I think it is not a problem with SWR as I tried various dummy loads and atennas. Also the SWR LED on the front panet should have ligted up in this case. But that did not happen. PTT works as the PTT LED turns red in case of transmissions. Besides that the SWR shutdown should be detectable using the serial terminal. But reading that also does not indicate a SWR problem.

    In fact I did return the unit yesterday and am now waiting for an information by the manufacturer. Let's see what happens.

    vy73 de Florian DF2ET

    Hi @ll,

    I have a Kuhne MKU UP 2424A up converter in use since February. During my /p activity from PA the converter obviously suddenly died. It does not output any power any more. The input settings were not modified. It happened just between two QSOs (or after a QSO as the next calling station could not be answered any more).

    Has anybody of the Kuhne users experienced such a problem? I heard of one case where this symtom also happend but the converter came back to life without any further action some days later.

    In my case this does not apply apparently and the converter is still dead ...

    Any hints or help much apprechiated.

    vy73 de Florian DF2ET ;(;(;(

    kann jemand reflow SMD löten? Habe Teile für DB4UM PA.

    pse hlp! =O

    (looking for help in reflow soldering here in Germany)

    tnx de Michael

    Hi Michael,

    ich habe einen Reflow Ofen und eine HotAir Station da. Die Platine und die Teile liegen auch schon bereit. Mit beidem sollte das kein Problem sein. Ich empfehle Lötpaste mit (hohem) Flussmittelanteil. Damit sollte es problemlos gehen. Ich nutze z.B. CR 44 von Reichelt:…-p6833.html?&trstct=pos_0

    vy73 de Florian DF2ET

    Dear OMs,

    walking around the flea market on HamRadio in Friedrichshafen we ( DG3YJB  DL5APR  G4KLX  DL1YDD with DL5BQ and G6WBJ) found some guy selling a 40cm dish for 8€. After we bought all of those we had a quick experiment at our holiday flat that we were staying in during the fair.

    After wiring up the commonly used setup (LNB -> BiasT -> SDR Stick) we could cleary decode the CW beacon and even listen to SSB QSOs. May those pics inspire people with limited capabilities to setup a QO-100 station ;-)

    vy73 de Florian DF2ET


    Absolutely no problem. Just wanted you to have that on the list for next year. If it's on there already I am fine.

    Besides this minor issue I found the meeting to be very useful and I would appreciate if we manage to have a similar meeting next year. Thank you for organisation.

    vy73 de Florian DF2ET