Posts by dm4im


    AFAIK, the bullseye lnb features a TCXO with 2ppm , while claims 1ppm. You need to make or buy a bias T from an outside source when you opt for bullseye. The comes with one included. Bullseye features a 25MHz output you only need when you want to reference a subsequent sdr like pluto and is exposed to changing temperatures and therefore might drift anyway. That might make it unusable as a reference for a sdr, but that's just my opinion . Others may prove me wrong. Personally, i'd go for You can get an adapter for your poty from them also.

    Hope that helps.


    Well, in your case sdr console talks to the pluto via usb/network, no serial ports are involved.

    My bad, sorry.

    Maybe this works: Create a "Connector" e.g. COM11, and set Log4OM to use this as the "Radio" port. Then create a TCP Client with the IP-Address and port of your pluto as Prameters and redirect the tcp stream to COM11. Does that work?


    Disclaimer: I do not have a pluto, i'm just guessing. I'm sure there are some smart people in the forum who figured out a way to do what you ask for.

    Now I have to fix the frequency, I receive the beacon at this frequency.

    If your picture shows the lower cw beacon 10489.500,0 received @10489.739,525 then your Pluto and/or your lnb is/are about +239 kHz off frequency. That is a LOT. The frequency range in GEOSTATIONARY BEACON Applet is plus/minus 100khz, so it will NOT receive the psk beacon on 10489.750,0 unless you cheat the RX OFFSET in the "Converter Definitions" applet by that amount - you have done that before with a smaller offset, so you know where to try - OR , better than that, correct your lnb and Pluto by modifying them with proper accurate crystals. Once you see the psk beacon in the GEOSTATIONARY BEACON window , you can switch on the applet, catch/click the beacon with your mouse, then start the correction.

    73, Martin


    your latest picture shows 2 leading zeros. When the the frequency range is max. 9.99 GHz, there is only 1 leading zero. Please restart sdr-console and see if it works. You sholuld be able to set a frequency around 10.489,750 to hear the psk beacon. 10.489,750-9.750=739.750 .

    73, Martin


    this is because the install script calls for incompatible libraries like libpulse-ocaml version 0.1.3.x.x.x on an operating system (bullseye, i suppose) expecting a different version. Find out what OS version DJ0ABR initially used, then flash this (older) OS onto your pi.

    Or install the libraries by hand and have bullseye choose the correct version number. Next open the install script, remove the lines calling for the libraries and run it again.

    Or wait for DJ0ABR to update the install script.

    From the install procedure on github:


    The install script was made for debian/ubuntu based Linux systems. If you are using another system then please do these steps manually:

    • clone this project
    • in the script QO100_Transceiver/sctipts/prepare_ubuntu_pluto look for the installation of several libraries and install them for your OS.
    • Install the latest version of the mono project (see prepare_mono as an example)
    • make clean and make the transceiver software




    Hi George,

    if it's linux, a raspberry pi 3 or 4 - if you find one - is all you need. I tested a raspberry 3 with a 7 inch display running DJ0ABR software and a loan Pluto from a friend. It worked. Other systems like odroid etc. may work too.

    73, Martin

    I kindly disagree with Martin: if you setup a 1.5m dish you should try to get out the optimum of it. Otherwise it is a waste of
    time and material ...

    I agree. I just wanted to point out, that even with a cumbersome antenna, you will have good results with a dish that diameter. My first antenna was the 4 element yagi pointing into the dish , the 2nd was a linear polarised patch feed without waveguide for the lnb and the one i'm using now is a poty . Learning by doing, improving over time. It is more important to have a clean signal, may it be not so strong. The LEILA triggering signals are for later, and even those are clean, if you overdrive NONE of your gear......



    P.S. : I don't encourage anyone to trigger LEILA.

    I will need some attenuation before the upconverter, minimum output on my TS2000 is 5 watt - and the upconverter needs between 1 and 3 watt, output alone should be a max of 200mW, so i need the amplifier, i am counting on being able to turn down the output power directly on the DXpatrol mk4 upconverter using the pwr adj, and in doing that limit the output from the amplifier.

    I don't buy that. If that is true, you must convert a max. of 2.8W into heat to have 200mW output. Meaning the upconverter has negative conversion gain (in the range of ~ -10/12dB) . If you have measurement gear for 2.4GHz it is of great interest what really is going on.

    Set your TS2000 to a good , strong audio , the audio you like to have when you talk on 2m or shortwave. Do not touch audio settings for the the following measurements. Set TS2000 to minimum available power with it's power potentiometer. Now insert a 20dB attenuator , this should result in 50mW output. Connect your upconverter and measure the output , while you adjust the power adj potentiometer on the dx-patrol board. If you don't get 200mW out, turn pwr adj to it's highest setting , insert about 15 or 13dB instead of 20dB, for ~200-250mW input to the upconverter. Repeat measurements. I'm sure you will reach the maximum output power with less than 250mW input.

    Many dx-patrol users say , the vox circuit will not work properly with low input power, but most of them adjust output power of their radios by reducing mic gain and compression. Which i believe is the wrong way.



    P.S. : I may be totally wrong.

    It is always beter to attenuate the INPUT TO THE Upconverter on the radio side , not the output after the upconverter . This will result in a clean signal without nasty sidebands. You should check if that is enough signal strength. If not, you still can kick in the amp. You will need attenuation ahead of the amp, I'm sure.


    Pic 1: Poty in the holder where normally the feedhorn of the original Hirschmann feed is located. The original feedhorn sits snug against the aluminum holder, but because the poty reflector diameter is 100mm, the 3 feed arms prevent it from being placed snug against it. The distance is 3-5cm , i think.

    Pic 2: Reveals the reflector size and why you can't push it closer to the focus position.

    Pic 3: To compensate for the poty not sitting in the focus, i liftet the 3 feed arms a bit above the dish with bolts and nuts. Observe the left side of the picture where the arms are mounted on ( ABOVE , that is) the surface.

    I'm pretty sure this still isn't the best position, but my signal is loud enough even on very low power and i can hear pretty well. Before i lifted the feed arms a bit up, the signal was loud, but afterwards I had to lower power by at least 4-6dB. To this date, i do NOT know my output power, maybe 2-3 Watts , minus the attenuation the 8m long cable from the amp to the antenna introduces.

    73, Martin


    with a dish that size, the antenna doesn't really matter much unless you plan to run very low power or datv.

    I use a 150cm PFA and got very good results even with the 4 element yagi the manufacturer of my upconverter provided as a free gift, pointed in the dish.

    With a POTY or Helix in the right spot (focuswise) you need to keep the power low (wich is good when you use dx-patrol, because they tend to overdrive everything)

    73, Martin