40.0°E Express-AM7

The reception conditions have not changed since the last post at 40.0 E,that is,the interference near the frequency of 3700 MHz,which can be best seen on the right polarity although the signal is very strong

Zitat von qwer

Just a complete scan from 2021... no changes.

Not lockable:

3928 R 4800 3/4 DVB-S2 8PSK

3960 R 5000 3/4 DVB-S2 8PSK

Looks like we have a new rate symbol at 3871 R,30000,3/4(see your spectrum above). I couldn't lock for the same reasons I have in C band,small antenna and interference

Nothing special happened to 40.0E, only this time I used Deeptho's new application, neumoDVB, under Linux for the 6903x card.

It scans much faster than other DVB applications under Windows for this card.

I also used the 6983 cards with the Crazyscan app and IQmonitor for the Express-AM7.

Can someone check the position of these two Russian muxes T2-Mi at 40.0E: 3721 L,15281,3/4,8PSK and 3761 L,25750 L,25750,2/3, as I get them closer to 45.0E, Blagovest 1, than at 40.0E?

I also checked at 49.0E, Yamal 601, and I'm not sure it's on this one.

Here's what I'm getting at 40.0E, and I don't think these two muxes could be in this position, instead at 45.0E, which I don't think. Maybe I'm wrong.

Yes, i also lock they. Maximum from 45E Cosmos 2520

Zitat von N_Stanislav

Yes, i also lock they. Maximum from 45E Cosmos 2520

...

Thanks, N_Stanislav, for the info and confirmation

So I'm not wrong about these T2-Mi muxes, but I didn't know there was another Blagovest 11L satellite, now Cosmos 2520.

Since the last visit to Express-AM7,I notice a new mux on 4085 L,15283,3/4,8PSL,PLP 0 & 1:

Here's my update for this high power position. Range 3700-4200 both circular.

Nothing has been changed, I think. Freqs. below 3800Mhz are under 5G and LNB partial rejection.

Zitat von superdish66

Here's my update for this high power position. Range 3700-4200 both circular.

Nothing has been changed, I think. Freqs. below 3800Mhz are under 5G and LNB partial rejection.

...

superdish66 , indeed, that between 3500-3700 MHz, interference "makes the law" so that it makes it difficult to find or lock C-band muxes. But I would still like to see your antenna influencing them at 40.0E with a big antenna like you have.

With my antenna, in my area, the critical point and the peak of this interference is at 3700 MHz so that anyone who enters its range simply does not see any mux, or it attenuates so much that it is below the threshold. And this happens even if the signal is strong like this Express-AM7 has.

I believe it is only because of this strong signal that I have been able to find and lock muxes below 3700 MHz. I thought that a bigger antenna, like yours, could "overcome" this interference.

I have often wondered, how on @Qwer's C-band spectrum such interference does not occur, because it seems to me that there is no place in a city to have no 5G transmissions or other terrestrial emissions. Maybe I'm wrong, but the only explanation would be that his large antenna, over 4m, is able to mitigate a lot of this interference. Is that true with your dish too?

What kind of a tool do you use to fight this interference if a large antenna is not able to mitigate it?

I used a 5G lnb for the C band, but unfortunately, its influence is more spotty and does not cover all the bands affected by this interference.

Here's what this interference looks like with my small antenna at 40.0E:

Zitat von satesco

superdish66 , indeed, that between 3500-3700 MHz, interference "makes the law" so that it makes it difficult to find or lock C-band muxes. But I would still like to see your antenna influencing them at 40.0E with a big antenna like you have.

With my antenna, in my area, the critical point and the peak of this interference is at 3700 MHz so that anyone who enters its range simply does not see any mux, or it attenuates so much that it is below the threshold. And this happens even if the signal is strong like this Express-AM7 has.

I believe it is only because of this strong signal that I have been able to find and lock muxes below 3700 MHz. I thought that a bigger antenna, like yours, could "overcome" this interference.

Mi sono chiesto spesso, come sullo spettro in banda C di qwer non si verifichino tali interferenze, perché mi sembra che non ci sia posto in una città dove non ci siano trasmissioni 5G o altre emissioni terrestri. Forse mi sbaglio, ma l'unica spiegazione sarebbe che la sua grande antenna, oltre i 4m, è in grado di mitigare molto questa interferenza. Vale anche per il tuo piatto?

Che tipo di strumento usi per combattere questa interferenza se una grande antenna non è in grado di mitigarla?

Ho utilizzato un lnb 5G per la banda C, ma purtroppo la sua influenza è più discontinua e non copre tutte le bande interessate da questa interferenza.

Ecco come appare questa interferenza con la mia piccola antenna a 40.0E:

Alles anzeigen

Hi satesco,

I don’t think that big dish solves, even partially, 5G interference problems.

Since late 2020 I have had this problem and tried every day, first thinking about my own wi-fi that was disturbing, then I read about 5G started in my area. Now there are three of those old 4G towers transmitting with new 5G just in front of my house on the whole Clarke belt (Left, Center, Right). Before that, I had only problems with WiMax from 3400 to 3550 as you could see in my old posts.

The law says that 5G in Italy can cover from 3600 to 3800 and for this range there are 5G Freqs on, here. If you don’t have special LNBs (or very good filters) all your spectrum is damaged, and unfortunately it happened to me. With old LNBs I was able sometimes to lock some Freqs., even in low band 3500-3700, but I was lucky because it happened when signal jumped so high, but it wasn’t possible to realize stable signal and pictures at all.

I slowly decided about hard investment for professional 5G LNBs Norsat 3800-4200. Spectrum now is flat from 3400 to 3700, so I cannot try what you ask. From 3700 to 3800 it’s partial rejection; -25dbm as you can see in my spectrums. In this range I can sometimes lock some Freqs., but not realize the picture at all. Anyway, from 3800 to 4200 it’s finally all right.

I could try for 40°E to change to old LNBs, but I already know which will be the bad answer.

Anyway, I’m almost sure that in 5G area, even if you own huge antenna, problems are the same.

Anybody, more expert than me, can confirm or not… Thank you.

Thanks for your reply, and I'm sorry that you also have problems with the interference you describe.

But sadder is that, from your answer, it is understood that they cannot be removed or mitigated with a larger antenna.

Maybe qwer will tell us how he manages not to have C-band interference, at least it is not noticeable on his analyzer.

This is the actual reception on Express AM7 on my location with 1.25 cm dishsize.

Hi,

yes we have 5G at my place too.

I can see "spikes" in lower range (3.4-3.5GHz) [from this position too].

Zitat von superdish66

Hi satesco,

I don’t think that big dish solves, even partially, 5G interference problems.

Since late 2020 I have had this problem and tried every day, first thinking about my own wi-fi that was disturbing, then I read about 5G started in my area. Now there are three of those old 4G towers transmitting with new 5G just in front of my house on the whole Clarke belt (Left, Center, Right). Before that, I had only problems with WiMax from 3400 to 3550 as you could see in my old posts.

The law says that 5G in Italy can cover from 3600 to 3800 and for this range there are 5G Freqs on, here. If you don’t have special LNBs (or very good filters) all your spectrum is damaged, and unfortunately it happened to me. With old LNBs I was able sometimes to lock some Freqs., even in low band 3500-3700, but I was lucky because it happened when signal jumped so high, but it wasn’t possible to realize stable signal and pictures at all.

I slowly decided about hard investment for professional 5G LNBs Norsat 3800-4200. Spectrum now is flat from 3400 to 3700, so I cannot try what you ask. From 3700 to 3800 it’s partial rejection; -25dbm as you can see in my spectrums. In this range I can sometimes lock some Freqs., but not realize the picture at all. Anyway, from 3800 to 4200 it’s finally all right.

I could try for 40°E to change to old LNBs, but I already know which will be the bad answer.

Anyway, I’m almost sure that in 5G area, even if you own huge antenna, problems are the same.

Anybody, more expert than me, can confirm or not… Thank you.

Alles anzeigen

I can confirm that what you say is absolutely correct.

About 2 years ago I also started having problems with C-band, first in range up to 3700 Mhz and then gradually up to 3800 Mhz until finally it affected the whole band, in my place 5G also covers the 3600/3800 Mhz range.

In my case I didn't need very expensive professional lnbs, with the Titanium C138 I managed to save the rest of C band but I had to give up all frequencies up to 3800 Mhz, in some cases up to 3820 Mhz.

Antenna size does not solve the 5G problem, I have a huge signal on the affected transponders but the interference prevents me from seeing a clear picture.

Just for info...checked only GS streams...

Scan in 2024...