Posts by DM4DS

    Hello,


    I found some pictures on twitter.


    73, Dolf.

    Interesting to see here my pictures 🤔🙂

    But that´s not the main reason for my posting.


    I tested the external ref and it works like it should. The CLK_Out is activated after CLK_Source is set to external.


    Also the PTT works if you set the "adress" correct.


    not made deep tests while busy with other things but thought it could be interesting for other to hear good news.


    PROCEDURE:

    use Putty or what you prefer

    login with 'root' - 'analog'

    fw_setenv refclk_source external // this enables the CLK_IN/OUT

    pluto_reboot reset // reboots pluto and the CLK_IN is active


    If your reference is not perfect you can correct it with:

    fw_setenv xo_correction 39999750 // for example


    Changing the frequency is done with:

    fw_setenv ad936x_ext_refclk '<25000000>' // You must use ' NOT " as describes in the WIKI since 0.32!

    Or you use: fw_setenv ad936x_ext_refclk_override '<25000000>'


    Don´t forget to reboot the Pluto to apply the changes with:

    pluto_reboot reset


    Easy and fast done.

    Hope it helps.


    Greetings

    Sandor

    As last solution, if you stuck, I can offer my help.


    Distance is a problem but if you send it, I can try my best.


    Received in the past 6 "dead" plutos and only 2 were really dead, the other 4 are working again. 1 with a squirrly signal but it works :) If it is really dead, I can send you a complete "new" moddified one if you want. TCXO, GND, PTT , whatever you need.


    Write me an eamil and give me some days, I do not check every day my mails.

    Hope I can help


    73
    Sandor

    DM4DS@gmx.de

    Hello,


    Received today a DUR-Line +Ultra Quad LNB and it is a PLL with RT350.

    The Crystal is on the TOP side with 25MHz.


    Horn diameter: 52,5mm with plastic

    Mounting dia: 40mm









    The cover is 4mm deep , enough space for parts ;)



    Also received the QUATTRO Version which is a PLL too!




    Greetings

    Sandor

    DM4DS


    Edit: Forgot Cover pics

    Edit 2: inserted pic Quattro inside

    Thought IU2KAC wants the Pluto in his LAN. Then the hardware is the wrong one. Thats why i posted before, but now it looks that he just wanted to extend the USB, then its ok.


    About extender:

    I tested an extender too , bought it for the LimeSDR.


    It´s a direct connection like USB, but with an Network cable as extension .

    The Pluto/Lime or whatever isn´t available in the network like it is if connected via a USB / LAN Adapter to your local network, cause it isn´t in the network. (Lime does not support direct LAN)


    My adapter as passive (without 5V extern) and worked over 5m LAN cable without problems. Took a standard CAT7 cable between, without configuration and it works. While the LimeSDR supports USB3 and my adapter don´t , i stopped experimenting.


    In my opinion, on a Pluto, the USB/LAN solution makes more sense if you already have a LAN. Then the pluto is from everywhere available, from Smartphone, tablet, PC, notebook etc. Also if you have a "server" running or super fast internet, from the WAN. The bandwidth is massive it needs, don´t forget that.


    Maybe you wanna try USB/LAN with your pluto IU2KAC...

    sorry that i write in english. Also not my mother language but much better than my italiano :)


    Have a good time and stay safe!

    Hello


    I can´t read the first post but i think he tryes to config PLUTO for LAN usage.


    You are using the wrong Hardware!
    This is a USB Extender , not a USB / LAN Adapter.


    It´s to make a USB "longer" via LAN cable . Not to adapt LAN via USB.


    Greetings

    Sandor

    Over the last 2 months I worked on the amp, original designed by PA3AXA, Rens.

    After eliminating all problems and a lot of optimizing after pimping the amp, I am proud to say: It´s done.

    The "next" version of this amp is running smooth and cold, with less current, lower Voltage but much more gain.


    Gain: 60dB , up to 66dB (minimum ~55dB)

    Rated constant output: 20W (SingleTone)

    Max Out: 30W but thats overkill even with low currents!

    Max input: ~15dBm! (Pluto has +3dBm @100% drive)


    It´s super linear up to 80% of its power. Hope Matthias DD1US can catch a sample to go deeper into measurements than i can do with my siglent SSA3032X analyzer. But psst, he doesn´t know that :)


    The plan is to build up to 15 pieces. Ready to use with 12V + 24V (22-28V).
    The 12V can be used as PTT or running 24/7. The heat with low currents isn´t high.

    Its mounted on a heatsink but for long term use, you should place a fan on the heatsink.


    If you are interested write me an email: dm4ds@gmx.de (please give me 1 2 days for answer)

    I hope to update my homepage soon with more informations and pictures + Videos of the measurements.


    Here are some pictures: while the minimum of my TG is -20dBm I inserted an extra 10dB attenuator.


    the PCB

    Case all will be build

    Case

    MAXIMUM Output with -13dBm input!

    After 10 minutes passic cooling @20W constant output sweep

    I first have to make a picture from the repaired one.

    The "old" one is no longer in use while the PCB traces burned after more than 35W on DATV....

    I received a different Amp with the "same" problem.

    The problem was quick found . It has nothing do to with the doherty or what ever. There are small 10Ohm R between the 28V and the Bias of each Transistor and they were "burned" . They are not complete dead, they are 50kOhm and so the voltage is wide too low.

    I soldered in new 10Ohms (5 on this one here) and the complete amp is working excelent. Nothing on the doherty was changed!

    Measure them on yours and i hope it´s the same on your side. You can measure them inside the AMP, no need to desolder them . 10Ohm or 50kOhm is a wide range and your Multimeter can this :)

    Have a nice weekend
    Sandor
    DM4DS

    Are you really paying 4€ per qsl?


    I know , a stupid question but I must ask.


    But what is more interesting for me: if yes, why?

    Update:

    the amp burned all PCB trace behind the combiner after 30 seconds on DATV with ~35W.

    Flo tried to repair it but was not able to do. Now it´s running only on 1 Transistor and running ~35W with very bad efficency.

    I modified myself another one and this one is doing 150W @ 28V @ 16A without any problems.

    Greetings

    Sandor
    DM4DS



    Old Post

    --------------------------------------

    Today i got the PA from DB8TF - Flo back . Amazing.


    Pictures #225


    First QSO was with Flo and its fantastic. For SSB it´s quick too much power with my 1.2m dish. I think it´s easy to trigger LeiLA , we didn´t!


    In KG-STV super clear Eye-diagram.


    After i figured out how to stream the small ksyms, i´m good for some DATV :)

    Thanks again Flo. Surprise follows!