Compare spectra with IQmonitor Pro

  • I recently visited the forum and was pleasantly surprised that the power outages and other nonsense in Ukraine
    didn't affect the work on creating software for satellite PCI cards :3:
    On the contrary, our ranks have been swelled by new young, energetic, creative, and, most importantly, talented
    and incredibly hardworking programmers! It's no secret that evil tongues say they use AI, but I don't believe it
    - after all, AI is a huge adding machine that searches, ranks, and summarizes information on a given topic across
    the vast expanses of the internet, summarizes the findings, and makes "its own" recommendations based on that
    information... It's simply INCAPITAL to create your own original invention {program} without the help of a creative person.

    But I've digressed – I'm incredibly pleased with the lively forum activity, the rapid growth of our ranks, and
    the interesting and promising work of new participants. And, of course, the opportunity to compare my results
    with the best mainstream achievements.

    Like many DXers, I've always been interested in the problem of finding low-speed transponders. And then I saw a
    very interesting spectrum, which I determined to be the spectrum from 42°E, which is the target of my "rotating"
    (but due to some circumstances in which my balcony door was torn from its metal fittings, it is now "fixed")
    1.05m antenna:

    As you can see from the video, a "blind search" with a 0.1 MHz step found 5 transponders in 137 seconds

    (27.4 seconds per transponder) with a noise figure of ~1 dB. The average scanning speed was 19.6 sec/MHz. The main
    transponder parameters (reported by StreamReader) are shown in the table. Including "clumsy" SR and integer RF
    values inflated by 6 dB...

    I called up IQmonitor Pro with a similar StreamReader to the highly respected crazycat , set the search step to
    38 kHz in the 11520-11529 MHz range, and ran the BLS procedure without first recording the RF spectrum in HR
    (high-resolution spectrum) mode:

    As a result, the spectrum was acquired in 167 seconds at a rate of 8.8 seconds/MHz (exactly 2 times faster). HR
    BLS found 6 transponders (27.8 seconds/transponder – a similar average transponder search speed).
    "Manual" search via the Feed Report procedure on a frequency of 11526.49 MHz Another low-speed transponder was
    found:

    Why at this frequency? More on that later. Or rather, going back through the chronology of the experiment, I
    performed a procedure to plot an HR spectrum, which shows that this transponder has an undefined FEC value due to
    powerful combination interference. Therefore, it was decided to refine it manually (as with subsequent
    transponders):

    A similar decision was made for the 11527.21 MHz frequency:

    Finally, an HR spectrum was obtained with eight low-speed transponders:

    And finally, another screenshot of the 11520 - 11530 V range with an HR step of 20 kHz :

    You can see all the transponder search parameters. Due to the very fine frequency increments of the HR spectrum,
    the scan took almost 24 minutes, but you can appreciate the increase in SNR by checking the "SNR 2x" box.
    But that's a topic for another serious discussion (why is the "TBS-6983" card checked for the "SNR 2x" search
    mode?)

    Good luck and good health to everyone :70:

  • Dear qwer , using a large antenna, recorded a spectrum in CrazyScan from a position of 38°2E, which can be considered a reference:

    Dear satesco , using an antenna slightly larger than mine, recorded spectra using other programs, including IQmonitorPro:

    For ease of comparison, I converted this spectrum to the scale and color scheme of the spectrum following it:

    Now it will be easier to compare L-spectra with the IQmonitorPro spectrum:

    After the table in the previous screenshot, it would be appropriate to provide a table of transponders found by IQmonitorPro:

    Please note that only IQmonitor Pro locked 7 (seven) L-polarization transponders :91:

    Comparing these two tables by the signal frequency - SNR, dB parameters for the first and then the second table, we obtained the difference between the second and first samples:

    ----------------------------------------------------------------------------------------------------------------|
    _____F 1____|__SNR 1__|_____F 2____|__SNR 2__|___F 2-F 1__ |__SNR 2-SNR 1__|

    ----------------------------------------------------------------------------------------------------------------|
    __4102.133__|___6.3___|__4102.03__|____7.0___|____-0.17___|________0.7______|
    __4180.120__|___7.4___|__4180.01__|____7.6___|____-0.12___|________0.2______|
    __4146.956__|___5.2___|__4147.39__|____6.7___|____+0.49 __|________1.5______|
    __4140.130__|___5.5___|__4140.14__|____6.5___|____+0.01 __|________1.0______|

    For completeness, I'll provide here for comparison the data obtained by satesco on its 1.1m antenna using other scanner programs:

    Now you can draw your own conclusions...

    Good health and success! :70:

  • strannik,

    Thank you for the comparisons you’re making based on my C-band reports from 38.0E; however, I like to think that these might also be of interest to the developers of the DVB apps I use. The only thing I need to do is ensure that my tests are accurate enough to be relevant from their point of view.
    However, I also use other DVB cards, apart from the 6983, with various DVB apps on Windows 11.

    That’s why I tested the 6909x card at 38.0E with NeumoDVB on Ubuntu 24.04 and with Crazyscan on Windows 11 (25H2).
    Whilst scanning with NeumoDVB at 38.0E and getting the results, I wondered how IQmonitor would perform under the same reception conditions. I don’t think I’d be wrong to say that both apps perform at the same level in terms of signal detection and the number of muxes found, even though I used the tbs6983 card with your app and the 6909x card with NeumoDVB.

    I’m attaching the test results for the 6909x and 6902se cards, using NeumoDVB, Crazyscan and TBS Universal 7.9.4. :3:

    7 antennas,including 2 of 150cm,one T90 with 16 lnbs
    lnb:Inverto Black Ultra with scalar rings and many Ku lnbs,
    C-band LNB:ESX241,Galaxy Inovations,EuroStar,MTI 20K,NS741U C/Ku,Inverto Single C-band Flange,lnb Chaparral Servo Motor & Skew Control
    LNB Ka:R9216DF XWM,Hughes FSS 19.7-20.2 GHz,
    6 satellite receivers,2 Meters,
    7 PC cards(tbs6983,6903,6590,6522,6209,2603,6909X,6903X,6504),3 tuners usb-tbs5927,tbs5925 & SkyStar USB 2 HD,
    Satellite reception between 100.5E-50.0W,
    Loc:Romania :3:

  • That’s why I tested the 6909x card at 38.0E with NeumoDVB on Ubuntu 24.04 and with Crazyscan on Windows 11 (25H2).
    Whilst scanning with NeumoDVB at 38.0E and getting the results, I wondered how IQmonitor would perform under the same reception conditions. I don’t think I’d be wrong to say that both apps perform at the same level in terms of signal detection and the number of muxes found, even though I used the tbs6983 card with your app and the 6909x card with NeumoDVB.

    Unfortunately, your assertion doesn't seem valid to me, as I haven't found SNR values for the TBS6909x anywhere and can't compare your results with your results with the TBS6983:

    109913-0522561a5292b67672d373bd09582c8eec24b07f68cdc8415445e26917dbc784-variant.webp
    109927


    Please obtain an HR spectrum from the IQmonitorPro and the TBS6909x card. Then we'll have a basis for comparison.

    Thank you.

  • Hello, you two (I’m glad to be reading your posts again, strannik)

    I’ve just done a test with my 1.80m antenna from a reception location that’s not as well positioned as Satesco’s. (TBS 6983)

    The results from IQMonitor Pro and TBS Universal 7.9.4 are very similar; both found six transponders in the H band (unfortunately, I can’t receive anything in the V band)

    Oberfranken
    1.80m Ch.Master Revolver 5 LNB

    IBU twin , Bulleye 10kHz, Kaonsat 13K, Inverto KaKuband,Kaband ( A)

    TBS6983; Openbox SX3 CI II ; Ustym 4K Pro ;SR-200HD extrem ; D15

  • I chose to configure IQmonitor Pro to scan both polarities at 42.0E. Unfortunately, I was only able to scan the satellite separately; I experienced two BSODs, likely due to a driver bug.

    When performing a full-band scan with the tbs6983 card (driver v.1.0.0.8) on both polarities, the signal is likely to be uneven on some transponders with different parameters; the card is under maximum strain.

    I have also noticed this with other DVB apps when I select a shorter scan time for low symbol rate muxes.

    Tests la 42.0E with the 6983 and 6909x cards using the IQmonitor Pro 1.0.2.8 app, Crazyscan, TBS Universal 7.9.6 and VMA StreamReader.

    7 antennas,including 2 of 150cm,one T90 with 16 lnbs
    lnb:Inverto Black Ultra with scalar rings and many Ku lnbs,
    C-band LNB:ESX241,Galaxy Inovations,EuroStar,MTI 20K,NS741U C/Ku,Inverto Single C-band Flange,lnb Chaparral Servo Motor & Skew Control
    LNB Ka:R9216DF XWM,Hughes FSS 19.7-20.2 GHz,
    6 satellite receivers,2 Meters,
    7 PC cards(tbs6983,6903,6590,6522,6209,2603,6909X,6903X,6504),3 tuners usb-tbs5927,tbs5925 & SkyStar USB 2 HD,
    Satellite reception between 100.5E-50.0W,
    Loc:Romania :3:

  • Mein Ergebnis mit IQmonitor 2407 und TBS_Universal_7.9.6

    My results with IQmonitor 2407 and TBS_Universal_7.9.6

    Oberfranken
    1.80m Ch.Master Revolver 5 LNB

    IBU twin , Bulleye 10kHz, Kaonsat 13K, Inverto KaKuband,Kaband ( A)

    TBS6983; Openbox SX3 CI II ; Ustym 4K Pro ;SR-200HD extrem ; D15

  • Mein Ergebnis mit IQmonitor 2407 und TBS_Universal_7.9.6

    My results with IQmonitor 2407 and TBS_Universal_7.9.6

    A brilliant result! :73: You've confirmed your reputation as a superb experimenter and the best IQmonitor user.:48:
    I'd be very grateful if you could indicate the time you obtained the second spectrum – that's FIRST.
    And if you could obtain an HR spectrum with the same parameters and scales – that's SECOND.


    As always, you're making a huge contribution to the program's development and have just provided invaluable information on the accuracy of blind scanning – this is in line with improving the accuracy of signal frequency measurements!

    Thank you very much.:74:

  • Unfortunately, your assertion doesn't seem valid to me, as I haven't found SNR values for the TBS6909x anywhere and can't compare your results with your results with the TBS6983:

    109913-0522561a5292b67672d373bd09582c8eec24b07f68cdc8415445e26917dbc784-variant.webp
    109927


    Please obtain an HR spectrum from the IQmonitorPro and the TBS6909x card. Then we'll have a basis for comparison.

    Thank you.

    satesco  

    Please obtain an HR spectrum from the IQmonitorPro and the TBS6909x card

    When working with IQmonitor and TBS 6983, please check the "TBS 6983" checkbox.

    Thank you for your understanding.

  • strannik

    Here’s what you asked for.

    The results are 99.9% similar (bear in mind that sometimes a feed appears and has already disappeared by the next scan).

    29 transponders locked, with a duration of 500 seconds or 510 seconds.

    Oberfranken
    1.80m Ch.Master Revolver 5 LNB

    IBU twin , Bulleye 10kHz, Kaonsat 13K, Inverto KaKuband,Kaband ( A)

    TBS6983; Openbox SX3 CI II ; Ustym 4K Pro ;SR-200HD extrem ; D15

  • satesco  

    Please obtain an HR spectrum from the IQmonitorPro and the TBS6909x card

    When working with IQmonitor and TBS 6983, please check the "TBS 6983" checkbox.

    Thank you for your understanding.

    I can no longer run the tests you requested in the C-band because I’m using my Ku-band antenna.
    I won’t go into detail, but for practical reasons, I don’t have much freedom to adjust the antenna as I’d like. That’s why my tests in this band are sporadic.

    Not that I’m complaining, but I’m working with the antenna under difficult physical conditions, and also because the massive interference in the C-band completely saps any desire to invest time and energy in achieving a satisfactory result. What I do with my little C-band antenna is a bit like cultivating your own frustrations. In other words – and it sounds pathetic – when you realise that the antenna is too small for your passion and there’s nothing you can do about it, I condemn myself to such feelings. It may seem exaggerated, but every time I work in the C band, it’s a form of self-flagellation. Small successes on the C-band, such as receiving from 38.0E, are encouraging, leading me to hope that all is not lost and that it’s still worth sticking with this band.

    Luckily, there are 5G-resistant LNBs, such as the Titanium C-138, because otherwise I’d give up on the C-band altogether. It gives you a little breathing space and room for hope. What else can you hope to achieve? ...

    Anyway, I’ll get back to you another time, and of course, I’ll do what you asked.

    I apologise that, instead of posting what you asked for, I’ve taken the liberty of sharing a bit of self-justification.
    For that reason, I’d also like to thank you for your understanding. :74:

    7 antennas,including 2 of 150cm,one T90 with 16 lnbs
    lnb:Inverto Black Ultra with scalar rings and many Ku lnbs,
    C-band LNB:ESX241,Galaxy Inovations,EuroStar,MTI 20K,NS741U C/Ku,Inverto Single C-band Flange,lnb Chaparral Servo Motor & Skew Control
    LNB Ka:R9216DF XWM,Hughes FSS 19.7-20.2 GHz,
    6 satellite receivers,2 Meters,
    7 PC cards(tbs6983,6903,6590,6522,6209,2603,6909X,6903X,6504),3 tuners usb-tbs5927,tbs5925 & SkyStar USB 2 HD,
    Satellite reception between 100.5E-50.0W,
    Loc:Romania :3:

  • Tests la 42.0E with the 6983 and 6909x cards using the IQmonitor Pro 1.0.2.8 app, Crazyscan, TBS Universal 7.9.6 and VMA StreamReader.

    I sincerely sympathize with your problems in the C band. It's a shame that you couldn't add the IQmonitor spectrum with the TBS6909x card to such excellent spectra you've provided... :37:

    I hope that you will help me with the comparison of Ku-band spectra using 6983 and 6909x cards using the IQmonitor Pro 1.0.2.8, Crazyscan, TBS Universal 7.9.6 and VMA StreamReader applications.

    110021

    Please re-register this spectrum and attach screenshots of the IQmonitor main window, which shows the registration parameters for both of the above mentioned cards.

    Thank you in advance

  • Ich kann momentan nur Vergleiche von Hellas Sat (fixe Antenne) anbieten.
    I can currently only offer comparisons from Hellas Sat (fixed dish).

    If you don't specify the antenna size and the approximate location, posting is useless if it's about signal acquisition.

    "Auto" should never be in the settings.

    Dish & Location

    N 48.602 E 15.553

    240 Irte (Ku/C)

    180 Laminas stationary (KaEABCD/Ku/C/X), mobil (all)

    120 Laminas (Ku)

    100 (Ku, 7°E/1.9°E/1°W), 85 (Ku, 13°E/16°E/19.2°E)

  • satesco  

    Please obtain an HR spectrum from the IQmonitorPro and the TBS6909x card

    When working with IQmonitor and TBS 6983, please check the "TBS 6983" checkbox.

    Thank you for your understanding.

    I thought the screenshot showing the 6909x spectrum at 38.0E in the C band had been deleted. I managed to recover it from among several files I’d thought were lost.

    Here’s what the spectrum looks like at 38.0E with the tbs6983 and tbs6909x, and of course, IQmonitor, if that was still needed. :3:

    7 antennas,including 2 of 150cm,one T90 with 16 lnbs
    lnb:Inverto Black Ultra with scalar rings and many Ku lnbs,
    C-band LNB:ESX241,Galaxy Inovations,EuroStar,MTI 20K,NS741U C/Ku,Inverto Single C-band Flange,lnb Chaparral Servo Motor & Skew Control
    LNB Ka:R9216DF XWM,Hughes FSS 19.7-20.2 GHz,
    6 satellite receivers,2 Meters,
    7 PC cards(tbs6983,6903,6590,6522,6209,2603,6909X,6903X,6504),3 tuners usb-tbs5927,tbs5925 & SkyStar USB 2 HD,
    Satellite reception between 100.5E-50.0W,
    Loc:Romania :3:

  • I sincerely sympathize with your problems in the C band. It's a shame that you couldn't add the IQmonitor spectrum with the TBS6909x card to such excellent spectra you've provided... :37:

    I hope that you will help me with the comparison of Ku-band spectra using 6983 and 6909x cards using the IQmonitor Pro 1.0.2.8, Crazyscan, TBS Universal 7.9.6 and VMA StreamReader applications.

    110021

    Please re-register this spectrum and attach screenshots of the IQmonitor main window, which shows the registration parameters for both of the above mentioned cards.

    Thank you in advance

    When I get the dish back to 42.0E, I’ll post the main IQmonitorPro window as well, so you can see the settings.
    For now, as I know you’ve been keen from the start to compare different TBS cards (and apps), I’m posting the spectrum I obtained with the TBS6983 and 6909X cards, scanned, of course, with Crazyscan. :3:

    7 antennas,including 2 of 150cm,one T90 with 16 lnbs
    lnb:Inverto Black Ultra with scalar rings and many Ku lnbs,
    C-band LNB:ESX241,Galaxy Inovations,EuroStar,MTI 20K,NS741U C/Ku,Inverto Single C-band Flange,lnb Chaparral Servo Motor & Skew Control
    LNB Ka:R9216DF XWM,Hughes FSS 19.7-20.2 GHz,
    6 satellite receivers,2 Meters,
    7 PC cards(tbs6983,6903,6590,6522,6209,2603,6909X,6903X,6504),3 tuners usb-tbs5927,tbs5925 & SkyStar USB 2 HD,
    Satellite reception between 100.5E-50.0W,
    Loc:Romania :3:

  • Das ist was ich heute Morgen auf Paksat 38° Ost, C-Band, V/H, empfangen kann.

    Here’s what I’m getting this morning on Paksat 38° East, C-band, V/H

    Вот что я получаю сегодня утром на спутнике Paksat 38°E, C-диапазон, V/H

  • I don't know why, but I have a new problem in Highband with all programs, VMA crashed total.

    same setting (6908)

    If you don't specify the antenna size and the approximate location, posting is useless if it's about signal acquisition.

    "Auto" should never be in the settings.

    Dish & Location

    N 48.602 E 15.553

    240 Irte (Ku/C)

    180 Laminas stationary (KaEABCD/Ku/C/X), mobil (all)

    120 Laminas (Ku)

    100 (Ku, 7°E/1.9°E/1°W), 85 (Ku, 13°E/16°E/19.2°E)

  • I also experienced two crashes with IQmonitor using the 6983 card at 42.0E whilst scanning the entire Ku band in both polarities. I only dared to scan one polarisation at a time, to avoid having the same problem again.

    In my opinion, the 6983 driver has a bug that occurs when scanning nearby transponders with a low symbol rate, or when switching between muxes with different parameters, putting the card under stress until it reaches an ‘edge case’. It can also occur with other DVB applications.

    It may also occur with other DVB applications, such as the 6908s, which have roughly the same hardware support.

    7 antennas,including 2 of 150cm,one T90 with 16 lnbs
    lnb:Inverto Black Ultra with scalar rings and many Ku lnbs,
    C-band LNB:ESX241,Galaxy Inovations,EuroStar,MTI 20K,NS741U C/Ku,Inverto Single C-band Flange,lnb Chaparral Servo Motor & Skew Control
    LNB Ka:R9216DF XWM,Hughes FSS 19.7-20.2 GHz,
    6 satellite receivers,2 Meters,
    7 PC cards(tbs6983,6903,6590,6522,6209,2603,6909X,6903X,6504),3 tuners usb-tbs5927,tbs5925 & SkyStar USB 2 HD,
    Satellite reception between 100.5E-50.0W,
    Loc:Romania :3:

  • I'm addressing all the authors of this thread, and especially the esteemed satesco !
    Thank you for demonstrating the spectra of various programs obtained using DVB-S2x cards, but if they aren't accompanied by the IQmonitor spectra you obtained under the same conditions and for the same cards in the same message, they won't match the topic title, and I'll have to delete such posts.
    No offense, but since readers won't be able to compare the performance of various programs with IQmonitor, such posts will only clutter the thread. They will be deleted in the future. Sorry, but that's the way it is.

    The last post doesn't contain any information comparing IQmonitor to other programs. It's not linked to any specific program or stream reader versions. I sympathize with you, but this post doesn't belong in this thread. I can't help you. This post will be deleted when the thread is cleaned up.

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