Posts by DB2OS

    I opened my Opticum LTP-04H and it looks very different from the ones you have..

    Did you buy it recently??

    It's seems to be an very old one, obviously with DRO instead of XTAL and PLL..

    You can scrap it...

    Edit: Just noted.. on the sticker: yours is "blue" line, the correct one is "red" line.. so it's not the same..

    Version 3 February 2021 – The following updated DATV (DVB-S2) bandplan and guidelines are designed to enable the most efficient use of the QO-100 wideband transponder (WB) for all amateur radio satellite users. Please make sure that you understand the guidelines and follow them accordingly. The use of DVB-S2 as the most efficient transmission mode is advised.…and-operating-guidelines/

    or for direct Download: QO-100 WB Transponder Bandplan V3

    this morning ISRO launched several satellites with frequencies in the amateur satellite spectrum, unfortunatly all of them seems to be without IARU coordination..

    • SDSAT 3 at 435.500 Mhz (uncoordinated)
    • GHRCESat at 437.500 Mhz (uncoordinated) and at 436.000 Mhz (uncoordinated)
    • JITSat 1 at 437.500 Mhz (uncoordinated) and at 436.000 Mhz (uncoordinated)
    • SSIETSat 1 at 437.500 Mhz (uncoordinated) and at 436.000 Mhz (uncoordinated)

    You are seeing a live spectrum view from Tianwen-1 telemetry transmitter received by the 20-Meter Antenna at the Bochum-Observatory in Germany. Tianwen-1 ("questions to heaven," or "questioning the heavens") is a Mars mission by China consisting of an orbiter and rover. It launched in July 2020 and enters Mars orbit on 10 February 2021 around 12:00 UTC. The rover will not land until May. Mission Lead: CNSA
    Follow us on Twitter:
    For more details about our antenna:

    Never say Never.. ;-)

    Good tracking programs are actually able to flip-over..

    Which means that with an 90° overhead pass you will have EL >90° ... <180° flip over...

    This is important with LEO satellites, in particular when you need to rotate AZ by 360° depending on where your Rotator Stop is (either Noth or Sourth)..

    If you have done the 180° calibration correctly, the 90° should be OK too.

    Again.. you have to mechanically bring it into 180° and make sure the antenna is horizontal aligned and only than you adjust the Potentiometer FULL SCALE ADJUSTMENT. And yes, the mechanical stop of the rotator is slightly more than 180°.. So you have to go in front of your house and check with your eyes if it's 180° or not :-)

    Most likely old Keplerian elements... calculated orbit and calculated doppler shift does not fit to the actual orbit. Please try updating the Keps and check if they have really updated..

    hello peter, meter functions properly and full scale adjusted - but the actual physical movement of the rotor arm is what I mentioned about going to 190 degrees or so. the picture i posted is about the antenna and not rotorator control box needle

    Yes, but how did you make the Full Scacle Adjustment than? I'm confused...

    You have to use the UP/DWN button carefully and turn your actual position of the rotor arm physically into exact 180 degrees... not as shown on the meter, physically!

    Then you adjust the potentiometer on the back side accordingly, so that the EL meter shows 180 degrees.

    From now on, whenever the meter shows 180° the rotator arm should be physically also 180°..

    If that's not the case, something is wrong.

    73 Peter

    0 is actual 0

    90 is close to 90

    180 degree is more like 190....

    It's called FULL SCALE ADJUSTMENT, please see Page 4 in the Manual, see the link from DM4IM.

    First do the ZERO adjustment of the meter with the screw below it (with power off), than bring your EL rotator *mechanically* into exact 180° position and use the Elevation Full Scale potentiometer on the backside to adjust the meter to show 180°. That's all... same procedure for AZ. This way you calibrate both meters on the Controller.

    73 Peter

    Ok, our Wiki (called Lexicon) is now online and needs your help and support...

    I hope we can make it a good resource for newcomers and experts on QO-100.

    We can add as many categories and sub-categories as needed and still re-organize it..

    Any hints comments are welcome.. We are ourself on the start of the learning curve, but hopefully improve the Wiki over time..

    Thanks to Thomas HB9SKA for volunteering to help organizing the Wiki/Lexicon..

    Enjoy, 73 Peter

    We are running a SatNOGS station in Bochum and one of the installations is dedicated to receiving weather satellites with a dedicated antenna:

    Does someone have experience either how to use the R2CLOUD client or how to receive LRPT with the SatNOGS client? Or which is a better solution for automatic scheduled APT reception? We have an Airspy HF+ Discovery and a RPI4B.

    r2cloud can track and decode various radio signals from satellites, including APT (weather satellite) and LRPT (weather satellite).

    If you have visited the forum for the first time (as a guest) a language selection appears in the menu.

    Here the language of the system is defined and also the default language for the topics and posts.

    As a guest you will only see topics in the respective language... so either "German" or "English", according to the setting.

    After registering, please go to the control center --> Settings --> General:

    now change the language if necessary and (very important!) select both check-marks for the content languages:

    regardless of your system language, you can now see *all* posts again.

    Unfortunately, there is no other easier technical solution, but I hope everyone can handle it.

    Now, when you create a new Thread, please enter the correct Language of the content you want to write. If you write it in english, please select English in the select box, otherwise select german.

    73 Peter