Interference in Ku-band and sat-inline amplifier

[satesco]

I have had big problems with satellite reception in C-band (now known by all who work in this band) and, in recent years, also in Ku-band. The antenna is installed in an area where I have a variety of terrestrial interference, not only in 5G but also in other natures. It can be well seen from the harmonics drawing where the signal is affected by interference. They manifest themselves in the Ku band between 11500-11700 MHz and 12400-12500 MHz; between 11500-11700 MHz, the noise is stronger than the useful signal. Sometimes also in the upper band around 12700 MHz.
The RG11 coaxial cable with solid copper length from the antenna to the tuner/device is around 90m.
For this, I buy a lot of satellite boosters. Unfortunately, the filters on each of them are limited to a few frequencies, which in some cases help me on some frequencies, but still do not help me to attenuate noise on other frequencies even if the signal is strong.
The amplifiers I have used so far have a reading of 10->20dB. I recently came across an adjustable amplifier from 0->30dB. It is the one in the picture below. I would ask the one with such an amplifier if it helps and is worth buying.
I am not the only one in this situation. Indeed there are other users in such a situation. That's why I would like to know how those with such a problem have solved it, and how?
I have used the following in-line amplifiers in the examples below: Axing 20dB, NIA8902 20dB, and Gooboy.
Which amplifier or solution do you recommend? Thanks.

 

[Terryl]

Unfortunately all you will be doing is raising the overall noise floor from the LNB output with a cheap consumer grade in-line amplifier.

A true low noise in-line amp for the 900 to 1200 MHz band would cost you big bucks.

The only way to get more out of the back end of a consumer grade LNB would be to get a bigger dish, or a better LNB with a higher IF output.

Do you have performance spec's on those amps? if so what are the noise floor spec's??

If they are published then look at the noise floor spec's on the LNB, (if you have them) and see if they are equal or higher, if higher then you going to inject more noise into the system.

 

[satesco]

For administrative and regulatory reasons, I cannot install a larger antenna. I would have changed it earlier if I could, but given the situation, I have to be grateful that I can use this one.
The amplifiers I used, the ones mentioned, were not accompanied by specifications; only the gain is mentioned on them, 20dB.
Unfortunately, devices/lnbs bought online, especially cheap ones, are not accompanied by much information/specs. It seems that the mentioned amplifiers have noise floor precisely as you said.
That's why I ask you to show me (where online, address) that in-line amp you recommend, even if it costs big bucks.
Many thanks

 

[Terryl]

Well most of the good amps are very pricey and most of the high end manufactures don't sell directly, the closest one I would trust as to not inject too much noise would be the one at the bottom of this post, but I don't know if they ship outside the US, you might be able to finds a distort locally.

https://www.solidsignal.com/sonora-14db-gain-satellite-dbs-amplifier-la141

 

[yang sat]

This kind of amplifier only improves the gain effect on the long cables above 100 meters. Filtering will only cause more trouble. It is best not to add between LNB and DVB. Unless the cable is really too long. Filtering can only buy filters. personal experience

 

[Terryl]

Here is another option, go fiber, I found this one but don't see the receiver end, maybe you could email them for more info.

https://alcadelectronics.com/en/product/optical-lnb-ku-band-7-dbm-9160031

 

[scopus]

Yes, fibre I would think would be the way to go here..

 

[ozumo]

11500 to 11700 - 9750LO = 1750 to 1950 IF. 1800MHz & 1900MHz bands are both used for 4G/5G, IBUs don't have 4G filters so may be worth trying an LNB that has one.

I believe @mapperuo uses fibre LNBs, he may be able to offer some advice.

 

[dreamsat]

Hello,
I often work with fiber optic systems in the company. In a normal application, this is a very optimal thing. You can really overcome very long distances with little loss.

The disadvantage for and DX's , is the small loss in the MER (S/N). This occurs with these systems unfortunately and in extreme reception this is very bad. In a community system for ASTRA 19° reception, this plays a very small role. In extreme reception, everything is then simply no longer there.

My feed line from my 2.20m antenna into the house is 76m long and I also use Telass cable 1.65/7.3. Everything goes with me without amplifier and it goes on this distance about 8.8 dB signal strength lost. The S/N or MER does not get worse. I have measured this before. With proper connectors (fittings) and good adapters should also 90m work well.

A radiation of G4/G5 can not prevent a fiber LNB if it has no filters, and you have the interference again.

best regards

 

[satesco]

Well most of the good amps are very pricey and most of the high end manufactures don't sell directly, the closest one I would trust as to not inject too much noise would be the one at the bottom of this post, but I don't know if they ship outside the US, you might be able to finds a distort locally.

https://www.solidsignal.com/sonora-14db-gain-satellite-dbs-amplifier-la141

I think this amp is what I need. I hope to find someone to send me this amp, Sonora, which I've never heard of before, even if it is the most expensive one I've seen.
Thanks for the link.

11500 to 11700 - 9750LO = 1750 to 1950 IF. 1800MHz & 1900MHz bands are both used for 4G/5G, IBUs don't have 4G filters so may be worth trying an LNB that has one.

I believe @mapperuo uses fibre LNBs, he may be able to offer some advice.

Maybe @mapperuo will tell me what lnb he uses.
I don't know if he uses it for the same reason I do: to mitigate as much terrestrial interference as possible.
Regards

 

[yang sat]

If it is 950-2150M, there is mobile phone 2-4G interference. In fact, you only need to buy kitchen aluminum foil to solve it. Wrap all F connectors. F connector for LNB and coaxial cable. The coaxial cable and the F connector of the multi-way switch. Coaxial cable and DVB F connector. All L-band jammers come in at maximum power from the F connector. Of course, your coaxial cable is qualified, it does not need to be particularly good.
In fact, the advantage of optical fiber transmission of satellite television lies in the long distance of more than 150 meters and multi-users.
The main problem is that the price is high.
Optical fiber LNB.
Optical fiber mixer.
Optical fiber power amplifier.
Optical fiber power splitter.
Optical fiber demodulator and satellite multiplexer.
And then to several groups of DVB-TV in a family.

 

[satesco]

Hi, @dreamsat,

Thanks for your intervention, especially since you're speaking from personal experience.
Good that you brought up the slight signal loss, especially with the antenna where I want to use the amp is aimed at the eastern satellites from which I am mostly trying to receive the signal from spots outside my reception area.
I use the Chinese scalar ring for IBU precisely because it is sensitive to lock the weak signal. This is a small/big dilemma for me if I choose between an optical lnb and an amplifier that protects only a few frequencies.

Hi, @yang sat,

Thanks for presenting some options for optical fiber. I will consider your suggestion when I decide which solution is best for my situation.
As I said, the length of my cable is around 90m, maybe a bit longer; I didn't precisely measure it because my coaxial cable crosses the entire roof surface going down from the roof of the ten-story building I live onto the third floor.
Best regards

 

[deeptho]

If it is 950-2150M, there is mobile phone 2-4G interference. In fact, you only need to buy kitchen aluminum foil to solve it. Wrap all F connectors. F connector for LNB and coaxial cable. The coaxial cable and the F connector of the multi-way switch. Coaxial cable and DVB F connector. All L-band jammers come in at maximum power from the F connector. Of course, your coaxial cable is qualified, it does not need to be particularly good.
In fact, the advantage of optical fiber transmission of satellite television lies in the long distance of more than 150 meters and multi-users.
The main problem is that the price is high.
Optical fiber LNB.
Optical fiber mixer.
Optical fiber power amplifier.
Optical fiber power splitter.
Optical fiber demodulator and satellite multiplexer.
And then to several groups of DVB-TV in a family.

Some DECT phones operate around 1.8Ghz. So the interference could also be caused inside the house and then shielding
outside will not help (much).

 

[Channel Hopper]

If it is 950-2150M, there is mobile phone 2-4G interference. In fact, you only need to buy kitchen aluminum foil to solve it. Wrap all F connectors. F connector for LNB and coaxial cable. The coaxial cable and the F connector of the multi-way switch. Coaxial cable and DVB F connector. All L-band jammers come in at maximum power from the F connector. Of course, your coaxial cable is qualified, it does not need to be particularly good.
In fact, the advantage of optical fiber transmission of satellite television lies in the long distance of more than 150 meters and multi-users.
The main problem is that the price is high.
Optical fiber LNB.
Optical fiber mixer.
Optical fiber power amplifier.
Optical fiber power splitter.
Optical fiber demodulator and satellite multiplexer.
And then to several groups of DVB-TV in a family.

Quality foil, some of the kitchen stuff is thin enough to let in allsorts.

 

[dreamsat]

I use these matching press plugs for the RG 11 cable. The 1.65mm inner conductor pushes a pin in which the inner conductor past to the outside. this has then again the normal dimension 1.13mm and can be used with suitable connectors werten. These plugs have greater 120dB shielding and interference at this point can not take place.
Unfortunately, for this assembly you need a tool and suitable crimping pliers.

 

[mapperuo]

I think this amp is what I need. I hope to find someone to send me this amp, Sonora, which I've never heard of before, even if it is the most expensive one I've seen.
Thanks for the link.

Maybe @mapperuo will tell me what lnb he uses.
I don't know if he uses it for the same reason I do: to mitigate as much terrestrial interference as possible.
Regards

I use the same fibre LNB linked above, I also have the C120 flange version. Im using fibre because my dishes are 100 meters from the house and was getting too much db loss on copper.

I have no expertise in this 4G/5G interference thing, but Id imagine any lnb fibre or not would suffer the same, as its not the wiring gathering the interference is it?