• Hello,

    I would like to open this topic to share experiences and tips for 5G and C-band interference.

    In Hungary 5G network installation has been started below 3.8 GHz.

    Some DX-er reported near 5G tower (around 5km) C-band almost totaly died. Over 3.8GHz as well.

    So if somebody has some similar experience or solution, please share in this topic.:3:

    Location: Hatvan/Hungary
    C band: dyras 175cm (83E-34W), Kaonsat 13K LNB
    Jonsa 240cm PFA (40.5W), Kaonsat 13K LNB
    KU band: 120cm offset+Invero BU single LNB
    Receivers: VU+zero 4K, Ustym 4K pro



  • here from me below 3600 ghz no signal, here is the wimax covering the C band

    Lodi sud

    laminas 180

    lnb invacom doppia flangia


    tbs 6925 sat

    rover tab 900 plus

    proform KTI h 180

  • Sky and star watchers have gone far from urban areas due to light pollution, I guess the same is expected of C band fans due to the 5G network :88:

    Location: Croatia, Kutina (16,778E ; 45,485N)
    ---------------------------------
    2,7m "Laminas" (Not in function :88: )

    1.8m Prodelin (Not in function :88: )

    1.2m Echostar + 36V HH motor 93,5E-61W (154,5° Clark's orbit):34:
    0,75m Kathrain CAS75 offset + Premium X diseqc motor (90E-55,5W)
    Multi-Feed "Wave Frontier" Toroidal Antenna T90 (28,5E-0,8W)
    TBS 5927;TBS 5925;TBS 6903;Octagon SF8008;DM 8000

  • The ADE antenna helped me against interference in the C band.

    Spectrum interference on prime focus antenna

    and ADE antenna, spectrum almost without interference.

               

    Geoposition: 48,71N, 21,92E. Promax Ranger Neo 2, TBS5925 :73: , TBS6983, TBS6903, TBS6903x, TBS6903x V2, TBS6522, TBS5520SE, TBS5927, TBS5590, Prof7301, PF 250cm, ADE antenna 370cm. Full band LNBs: S, L, C: NJS8487S PLL , NJS8488S PLL, X PLL, Ku NJR2842S PLL, Bullseye 10kHz PLL, full Ka band PLL, and other iron for DX reception, 53W - 98E. :68:

  • What's an ADE antenna?

    ADE = Axis-Displaced Dual-Reflector Antenna

    It is an antenna with a secondary reflector, similar to a cassegrein or gregorian. The difference is in the picture. These are high efficiency antennas.


       

      

    Geoposition: 48,71N, 21,92E. Promax Ranger Neo 2, TBS5925 :73: , TBS6983, TBS6903, TBS6903x, TBS6903x V2, TBS6522, TBS5520SE, TBS5927, TBS5590, Prof7301, PF 250cm, ADE antenna 370cm. Full band LNBs: S, L, C: NJS8487S PLL , NJS8488S PLL, X PLL, Ku NJR2842S PLL, Bullseye 10kHz PLL, full Ka band PLL, and other iron for DX reception, 53W - 98E. :68:

  • Hey Peon,

    that sounds really intersting. Which manufacturer produced your antena?

    It's a segment dish, so is ku-band reception also efficient?

    I always wondered why there are no more Fibo/Gregorian antenas on the market any more.

  • Hi newsy,

    This is an antenna from NWIEE, originally for X band Transmit and C band Receive.

    After appropriate modification, I use it for all frequency bands, C, X, Ku and Ka. I'm still tweaking it. However, it may not be as accurate for the C band. But even so, its gain is slightly better by about 1 to 1.5-dB compared to a prime focus antenna of the same diameter. The immunity to LTE internet interference is very good.

    Geoposition: 48,71N, 21,92E. Promax Ranger Neo 2, TBS5925 :73: , TBS6983, TBS6903, TBS6903x, TBS6903x V2, TBS6522, TBS5520SE, TBS5927, TBS5590, Prof7301, PF 250cm, ADE antenna 370cm. Full band LNBs: S, L, C: NJS8487S PLL , NJS8488S PLL, X PLL, Ku NJR2842S PLL, Bullseye 10kHz PLL, full Ka band PLL, and other iron for DX reception, 53W - 98E. :68:

  • Hallo,

    From 2022 december my C band totaly interrupted duen to 5G tower started operation around 400m from my dish.

    I installed Titanium C138 5G filter LNB (total rejection till 3.8GHz.

    That's working fine. Here you can see the result compared to normal Kaonsat LNB:

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    Location: Hatvan/Hungary
    C band: dyras 175cm (83E-34W), Kaonsat 13K LNB
    Jonsa 240cm PFA (40.5W), Kaonsat 13K LNB
    KU band: 120cm offset+Invero BU single LNB
    Receivers: VU+zero 4K, Ustym 4K pro

  • Dear, Chucky!

    Few months early ago i'm writed two post to sat.hu forum. The post showing, how its works the 5G system in the many countrys.

    netboard.hu fórum


    Your problem not 5G radio signal, but the your used system, and/or system connected pieces, the cable shield, DISEqC switch, and connector shileds, and the interferece, in the 950-2100 MHz band range

    The example, to the your anomaly.

    You need the receiving any C-band signal. This signal frequency higher than that 5G frequency, but!

    Your LNB converter, converting C-band signal to the lowest 950-2100 MHz, this band maybe the anomaly.

    If need you the C-band signal receiving, this frequency band or spektrum not yor problem cases, because not same the receiving as 5G frequency, because the broadcast reception frequency highes, not 3,4 GHz or 3,8 GHz.

    Example:

    netboard.hu fórum

    The infterference, and harmonic maybe present, the 950-2100 MHz frequency range.

    And more one importatn.

    The LTE filter, not filter, only this "name".

    This function, cuts it out the 3,4-3,8 GHz range, ergo the LNB oscillator not converting to this signal range, so there is no interference, therefore, the satellite receiver does not detect the interference.

    (Sorry, i dont speak perfectly English.)

    Bests, regard

    SaTom

    Andrew 370 cm PFA (26E/28.2E UK); 2x180 cm PFA (7E EUB,W; 7W NWA,MENA); Parsat 220 cm PFA; Hirschmann 130 cm (26E); SAB 100 cm (52E E,W); Wavefrontier T90 (5W, 4W, 0.8W, 9E, 13E, 19E, 31,5E) Visiosat 96 Gregorian

    Dr. HD Grand Triple; Illusionsat M3; iBravebox V7; TBS6903; GoldMaster SR-525; Amiko A5 Combo; GTMedia GT Combo

  • Greetings SaTom.
    You are right about something, but if there is a strong transmitter on the relevant frequencies that is close to your receiving device - antenna, then you have a problem with reception. You are probably lucky that the mentioned frequencies are not used in your location. Unfortunately, with us, it is occupied from 3400MHz to 3800MHz. I am attaching tables of assigned frequencies.

    Partial help is in the relevant antenna, but even that is not a 100% solution. The interference is suppressed, but the useful signal is still partially damaged. :25: RE: 5G vs. C-band

    Geoposition: 48,71N, 21,92E. Promax Ranger Neo 2, TBS5925 :73: , TBS6983, TBS6903, TBS6903x, TBS6903x V2, TBS6522, TBS5520SE, TBS5927, TBS5590, Prof7301, PF 250cm, ADE antenna 370cm. Full band LNBs: S, L, C: NJS8487S PLL , NJS8488S PLL, X PLL, Ku NJR2842S PLL, Bullseye 10kHz PLL, full Ka band PLL, and other iron for DX reception, 53W - 98E. :68:

  • Hi, Peon!

    Yes, its true, my answer firstly prioritated say to Chucky, and secondary information to all, therefore im writed, "the many countrys", of course, not all.

    With in many country, not "secondary", the QTH place, and the base station frequency range.

    But!

    Te question exactly, your which satellite, where are you want to receive?

    If you country (Slovakia) using the 3,4 to 3,8 GHz range, what is the satellites, which in this band range broadcasting?

    Second question (without DX), that this satellites footprint cover inside, or outside ont the your QTH palce?

    Third question, the your system noise, harmonic frequency, with the near base stations, and the system shields in context.

    Four, the received signal frequency, and oscillator to converted frequency and context in the "area" noise...

    And, many more question, and parameter...

    If you send to me spektrum, I will be happy to examine to you.

    Momently also I now working this project. (My friend (zoro67) having, and use SDR, but too many problem have receiving....high noise, many harmonic frequency, etc)

    One, or two week (or litle maybe later), if ending this my measuring project, showing to you, and all forum members the studies, and possibel solutions also.

    Best, regards

    SaTom

    Andrew 370 cm PFA (26E/28.2E UK); 2x180 cm PFA (7E EUB,W; 7W NWA,MENA); Parsat 220 cm PFA; Hirschmann 130 cm (26E); SAB 100 cm (52E E,W); Wavefrontier T90 (5W, 4W, 0.8W, 9E, 13E, 19E, 31,5E) Visiosat 96 Gregorian

    Dr. HD Grand Triple; Illusionsat M3; iBravebox V7; TBS6903; GoldMaster SR-525; Amiko A5 Combo; GTMedia GT Combo

  • Thank you for your response SaTom. :70:
    I understand your questions, but it is useless to deal with system noise when the interfering signal is twice as strong as the signal from the satellite. I personally receive satellites from orbit from 53 west to 98 east. The band from 3.4 to 3.7GHz is mainly used by satellites located in the east. In the western positions, they are gradually turning off the transponders in the disturbed band. Reception outside the disturbed band is problem-free.

    Geoposition: 48,71N, 21,92E. Promax Ranger Neo 2, TBS5925 :73: , TBS6983, TBS6903, TBS6903x, TBS6903x V2, TBS6522, TBS5520SE, TBS5927, TBS5590, Prof7301, PF 250cm, ADE antenna 370cm. Full band LNBs: S, L, C: NJS8487S PLL , NJS8488S PLL, X PLL, Ku NJR2842S PLL, Bullseye 10kHz PLL, full Ka band PLL, and other iron for DX reception, 53W - 98E. :68:

  • Hi, Peon!

    Yes, as I already wrote to you, your case, and country dont perfect example the system noise, and any factores, but many countrys, QTH and base station, distance, system noise, bringing to equipotential, system grounds, many in context true, as I wroted before.

    Its my country dont same problem, because different the 5G system parameter, different the factor level, and disturbing parameter, but same the broadcasting, or receiving frequency.

    If i ending the 5G measuring, and evaluation, i showing the studies regarding my country, and problems (even like my Chucky's, zoro67 friends problem) Of course, this studies dont tru all country in the world, but it may be true, many country :-)

    "In the western positions, they are gradually turning off the transponders in the disturbed band." Yes, this the relative long tima solutions. The broadcasting frequency uppering to the high range in the all country, or int the world is.

    (Maybe, and for good, but until then time, finding need to the solution)

    Sorry, i f i dont spekaing correctly in engllish. I was self-taught int the language. My country, it ago time was taught the Russian :-)

    Andrew 370 cm PFA (26E/28.2E UK); 2x180 cm PFA (7E EUB,W; 7W NWA,MENA); Parsat 220 cm PFA; Hirschmann 130 cm (26E); SAB 100 cm (52E E,W); Wavefrontier T90 (5W, 4W, 0.8W, 9E, 13E, 19E, 31,5E) Visiosat 96 Gregorian

    Dr. HD Grand Triple; Illusionsat M3; iBravebox V7; TBS6903; GoldMaster SR-525; Amiko A5 Combo; GTMedia GT Combo

  • Hi Satom,

    I understand your explanation about cable, diseqc switch, etc.

    But if that is true, KU band reception also should be problem. Because KU LNB converting the signal to same range. But no any issue in KU band.

    So based on my experience, the only solution is to use this new "filter"LNB. Since I use that, I have no any problem with C band reception.

    Location: Hatvan/Hungary
    C band: dyras 175cm (83E-34W), Kaonsat 13K LNB
    Jonsa 240cm PFA (40.5W), Kaonsat 13K LNB
    KU band: 120cm offset+Invero BU single LNB
    Receivers: VU+zero 4K, Ustym 4K pro

  • Ich weiss nicht wie lang bei mir dauern wird ,

    z.Z. trotz einen TelekomMast 500 m von mir entfernt

    habe ich noch keine Störung ( denke ich )

    I don't know how long it will take for me,

    at the moment despite a Telekom mast 500 metres away from me

    I don't have any interference yet ( I think )

  • chucky

    das Problem liegt nicht am Ausgang des C-Band LNBs, sondern an dessen Eingang.

    Die Ausgänge liegen im gleichen L-band Bereich wie auch das Ku-Band.

    The problem is not with the output of the C-band LNB, but with its input.

    The outputs are in the same L-band range as the Ku-band.

    A probléma nem a C-sávos LNB kimenetével van, hanem a bemenetével.

    A kimenetek ugyanabban az L-sávban vannak, mint a Ku-sáv.

    Im Idealfall ist der böse 5G Strahler hinter der Antenne, dass ist auch der LNB Bereich von dessen Einstrahlung einigermaßen abgeschirmt.

    Je nach Region und Mobilfunkanbieter ist auch die verwendete 5G Frequenz unterschiedlich, wodurch es zu unterschiedlich starken Auswirkungen.

    Ideally, the evil 5G radiator is behind the antenna, so that the LNB area is also somewhat shielded from its radiation.

    Depending on the region and mobile phone provider, the 5G frequency used also varies, which can lead to varying degrees of impact.

    Wer nicht die Antennengröße und den ungefähren Standort angibt, postet sinnlos, sofern es um eine Signalerfassung geht.

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

    Dish & Location

    N 48.602 E 15.553

    240 Irte (Ku/C)

    180 Laminas stationär (KaEABCD/Ku/C/X)

    180 Laminas mobil (all)

    120 Laminas (Ku)

    100 (Ku, 1.9°E/7°E), 100 (Ku, 27.5°W), 85 (Ku, 13°E/16°E/19.2°E)

  • Here's a scan using an EF Data 35K LNA with a vertical linear feed with scalar at 1.5m above ground, no dish. The location is surrounded by trees about 40km east of London, UK.

    The analyser was set to max hold for about 10 minutes.

    Marker 1 3.8GHz, 2 4.2GHz and 3 peak level

    Radar altimeters are visible around 4.3GHz

    1.2m Prodelin 3122 az-el (Not in use) with one of:
    S: Helical feed, 0.8dB NF LNA, X: 1.2dB NF LNA, conical feed, Ku 12-18GHz: corrugated conical feed, 1.5dB NF LNA, Ku (Standard): SMW Q-PLL type C, Prodelin feed. Ku (Extended): 11.3GHz LO SMW & Prodelin Feed Ka: Gilat ex-ODU PLLs Gilat feeds, Ka 18-26.5GHz: Patriot feed, home made 4dB NF LNA, Ka DSN: Corrugated conical feed, 3dB NF Down-Converter

    1.8m PF, Polar mount with SMW Q-PLL type C or R, Precision/Elite feed
    40km East of London, UK

  • Endlich habe ich mich aufgerafft, den Hohlleiter-Vorsatz zu testen.

    Ich hatte mir den 3°W ausgesucht, weil dort linear gesendet wird.

    Nachdem die Antenne justiert war, der erste Scan mit AVCOMM und Zinwell LNB.

    Warum hier auf H und V das Gleiche ankommt, weiß ich nicht.

    Dansch montierte ich ein Titanium, auch hier wurden die Transponder gefunden, auf der Ebene wo man sie erwartet.

    Der Test mit dem Hohlleiter-Vorsatz war nicht von Erfolg.

    Das hier schwach ankommende Signal des Satelliten mag zwar beteiligt sein. Die Hauptursache liegt vermutlich an der Länge des Vorsatzes.

    Ich hatte sie so gewählt, dass sie >1 Lambda der kleinsten Frequenz beträgt.

    Eigenartig sind für mich die Peaks in den Spektren, obwohl es hier, zumindest bisher, in 15 km keinen 5G Mast gibt.

    I finally got myself together to test the waveguide attachment.

    I chose 3°W because it broadcasts linearly there.

    After the antenna was adjusted, the first scan with AVCOMM and Zinwell LNB.

    I don't know why the same thing applies to H and V here.

    I then mounted a titanium, and here too the transponders were found, at the level where you would expect them.

    The test with the waveguide attachment was not successful.

    The satellite signal, which arrives here weakly, may be involved. The main reason is probably the length of the resolution.

    I had chosen it so that it was >1 lambda of the smallest frequency.

    The peaks in the spectra are strange to me, although there is no 5G mast within 15 km, at least so far.

     

     

     

     

    Wer nicht die Antennengröße und den ungefähren Standort angibt, postet sinnlos, sofern es um eine Signalerfassung geht.

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

    Dish & Location

    N 48.602 E 15.553

    240 Irte (Ku/C)

    180 Laminas stationär (KaEABCD/Ku/C/X)

    180 Laminas mobil (all)

    120 Laminas (Ku)

    100 (Ku, 1.9°E/7°E), 100 (Ku, 27.5°W), 85 (Ku, 13°E/16°E/19.2°E)

  • Hi femi,

    My long-term tests with different depolarizers clearly speak in favor of an ordinary depolarizing plate of the right thickness, length and material. The best location is directly at the mouth of the waveguide. Then there is no inclination of the polarization plane depending on the frequency. Even the original depolarizer from the antenna manufacturer, located in the middle of the waveguide, did not reach the parameters - separation of polarization planes, tilt of the polarization plane. With the depolarizing plate in the mouth of the waveguide, I achieved suppression of the opposite polarity up to 22dB. :73: The original depolarizer reached only 12-15dB. :25:

    If you used AVCOMM and Zinwell LNB, you changed the linear polarization to circular, therefore you have the same TP in both frequencies. But you surely know that.

    Geoposition: 48,71N, 21,92E. Promax Ranger Neo 2, TBS5925 :73: , TBS6983, TBS6903, TBS6903x, TBS6903x V2, TBS6522, TBS5520SE, TBS5927, TBS5590, Prof7301, PF 250cm, ADE antenna 370cm. Full band LNBs: S, L, C: NJS8487S PLL , NJS8488S PLL, X PLL, Ku NJR2842S PLL, Bullseye 10kHz PLL, full Ka band PLL, and other iron for DX reception, 53W - 98E. :68:

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