Anti-interference filter for c-band

satosk

satosk

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Hi Satesco,
Peon got to a conclusion as he is battling the same problem, but he never says things without proving them first.
So do not spend any money on items suggested above or change your cable for a "better" one.
For the tests he`s got all things that are needed, even he is sure there will be no other conclusion than what he has in mind right now. That means there is NO solution in your, his and many other cases as we`re loosing a battle against Wi Max.:N

But to prove it, the following hardware will be tested:
Norsat 8515 (3.7-4.2 GHz)
MFC 7893D filter (3.7-4.2 GHz)
Norsat BPF-C1 filter (3.7-4.2 GHz)

Also, he wanted to show you that there is a big difference if an ordinary PF dish is used in the area where an interference occurs to a professional ADE antenna. There`s WiMax in his area, too, so he can tell a lot from every day experience how things (don`t) work...

C band interference (1).jpg C band interference (2).jpg C band interference (3).jpg C band interference (4).jpg
53E Express AM-22 , 250cm.jpg 53E Express AM-22 , 370cm.jpg
60E Intelsat 33 , 250cm.jpg 60E Intelsat 33 , 370cm.jpg
 
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satesco

satesco

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932
My Satellite Setup
seven antennas,one toroidal with 16 lnbs,
6 satellite receivers,2 Meters,9 PC cards(tbs6983,6903,6590,6504,6522,6209,2603,6909X,6903X,skystar hd2),2 tuners usb-tbs5927 & tbs5925,Skystar HD.
Satellite reception between 100.5E-50.0W
My Location
Romania
Hi Satosk,

Thank you very much for your advice and Peon's.And because the problem you described is similar to mine,I will have to take your advice into account in case I decide what to choose from the solutions proposed by the users above,all interesting not only from a theoretical point of view,but also practically.
I was about to buy a filter,even expensive,like those in your picture,but looking at your spectr and what you wrote,I feel discouraged.Even if I do not have a professional antenna,like @PEON, I have to decide which of the proposed solutions could help me somewhat.
And if the situation is as you describe it,I wonder,on this occasion, what cable operators do when they have interference in the band they use?Because I saw on the high buildings in the city installed satellite antennas near those for mobile?What technical solutions do they use in such situations?
I'm waiting for the warm season to come up to try some of the options proposed by the forum colleagues.
Anyway,I'll remain indebted to your intervention.Each of these helps me decide :unsure
Kind regards :)
 
satosk

satosk

Member
Messages
117
My Satellite Setup
Be independent and your TV screen will never be the same.
My Location
Slovakia - Heart of Europe
Peon`s a bit busier these days as he expected `cause of Es`hail 2 + nice weather outside, but he asked me to upload the following pictures for you to show you (and others, of course) what a satellite dish can do with interference signals. The following example was made on Eutelsat 10A @ 10E.

2.5m vs 3.7m ADE antenna

There`ll be tests as mentioned above. Peon always keeps his promises. :Y

Internet interference on a 2.5m PF antenna.jpgwithout Internet interference on a 3.7m ADE antenna.jpg
 
satesco

satesco

Specialist Contributor
Messages
932
My Satellite Setup
seven antennas,one toroidal with 16 lnbs,
6 satellite receivers,2 Meters,9 PC cards(tbs6983,6903,6590,6504,6522,6209,2603,6909X,6903X,skystar hd2),2 tuners usb-tbs5927 & tbs5925,Skystar HD.
Satellite reception between 100.5E-50.0W
My Location
Romania
Hi satosk,

Theory as a theory,but still...a big dish saves me from interference!That's the message of your pictures, for which I thank you :)
Demonstrate as much an entire thread about them.And,alas,I can not install a large antenna in my location.I feel like I'm being amputated because of it... :( I console myself though with Ku or Ka-band...
Regards
 
Channel Hopper

Channel Hopper

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The doubling of the incoming signal, as well as a narrower beam width will be why the 3.7m performs better, but there will be a different result in every location.

Your interference source is positioned higher than the dish location, it’s going to be difficult to remove a similar level of unwanted noise..

Go on, cut some cables.
 
Channel Hopper

Channel Hopper

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In the UK all the four Mobile Network Operators hold spectrum licences in this frequency block, they were obtained in an auction last year - the intention is to have these frequencies ready to use for rolling out 5G networks in the near future. There are also blocks in this band used by UK Broadband (now owned by Three) which is being used for both portable and fixed access LTE based broadband in London and Swindon under the "Relish" brand. In Ireland blocks in the same frequency spectrum are being used for fixed wireless broadband services, one of the most popular services being "Imagine".

As far as I know many countries in mainland Europe have something similar in place with varying levels of coverage. In general using the 3.4 to 3.8GHz band for terrestrial use in Europe is less problematic right now due to C Band satellite being used very little for feeds, network distribution & and DTH services in comparison to the rest of the world - the big exception being Russia who still extensively use C Band for domestic distribution. For everything else Ku Band dominates, with a small amount of activity on Ka. BUD's never really caught on over here. Of course, for those in Europe wanting to receive C Band satellite signals this isn't of much help.

I can't find this mentioned elsewhere on the forum, but the first selloff in the US is expected mid 2020, a freeing of some 300MHz in the important band may follow after a vote next month.

However, the 3.5GHz CBRS band isn't the spectrum that's generating the most interest for 5G. The FCC is also looking at ways to release C-Band spectrum for 5G. The C-Band sits between 3.7GHz and 4.2GHz, but is currently being used for the delivery of video. However, the FCC is evaluating ways to free up spectrum in the band for 5G. That effort is expected to produce far more spectrum -- between 200MHz and 500MHz for 5G -- and is therefore much more valuable to 5G providers than a mere 70MHz of 3.5GHz spectrum. The FCC is expected to vote on the C-Band in November, and some analysts expect the agency to release up to 300MHz of C-Band for 5G.


There was talk of an exclusion zone, but it was related to Alaska only.
 
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Channel Hopper

Channel Hopper

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