hi
I have(we have) a big problem here. I found this forum and i thought i can solve my problem.
I live in iran. as u know(u here in news) the government send noise to breakup ku band signals. (i think it should be TI) (often from 12pm to 12 am)
anyway. i found some techniques to avoid/reduce this issue..(covering LNB with a piece of aluminum , etc). but these were not useful.
know, i came here and im asking u , do u know how i can reduce this noises?
(I use a 90 centimeters dish , a ku band starsat LNB(SR-320 max) and a starsat x-95 receiver . i want to reduce or remove noises on Hotbird 8 and nilesat)
:up
here is a view of our roof
Unfortunately i cant place the dish near ground, because i live in apartment. however there is a dome roof i can use as a hard shield between my dish and the source of TI.
I will try this tomorrow after my school. I will tell u the result.
but there is a question for me. as u see in map, the BTS antenna ( source of TI) is in front of my dish. if i want to use a mesh, i have to put this in front of dish. will not this block the dish?
and another Q
. the dish is on roof and is connected to the surface of roof. isn't this enough or i have to connect it to earth connection( roof is connected to the walls and walls are connected to the earth
)
right now one of my friends recommended a type of LNB.
it is:
Ultra Low Noise Inverto LNB
Single High-Gain Low Noise 40mm LNB
HDTV DVBS2 Compliant 0.2dB
i dont know. maybe i will try this LNB as the final method.
Timmyturner,
Welcome to satelliteguys!
This is definitely an interesting subject, to say the least.
First of all, is the BTS transmission set to purposely interfere with your signals? Or is this simply a coincidence that it is so near and so strong of a signal to you that it interferes that much?
If it is being done on purpose to prevent you from receiving a good signal and to irritate you, you may have to implement some stronger counter-measures.
Looking at your image of where your dish is set and where the BTS broadcast is eminating from, (which was a very excellent image to help explain the situation) I would say first of all that moving the dish to the right side of the structure in the center of the roof would definitely be helpful. The wall of that structure would serve as a natural sheild to some extent as it would be between your dish and the BTS signal. I would try this notion first as it is fairly simple just to run a longer cable over to that particular location (rather than build some sort of sheild enclosure). If you can get away with making use of something that is already present, that would save you some work.
Regarding your question about grounding to earth or grounding to the structure of the building, that really depends on many variables. If the building you live in has a superb metal frame and that metal frame is well grounded to the earth, then you are probably in excellent shape by simply attaching the ground to the building's metal framework. However, I don't know what you have for local regulations regarding electrical codes. This may not be legal for your city or state/province or national laws or codes. Especially if you are living in a multi-family dwelling or apartment complex with others whose safety may be concerned.
The most important purpose for grounding is to redirect any lightning strikes away from the building and especially away from the interior of the building and shunt it to earth ground for safety reasons (fire and shock).
However, proper grounding can be an extremely in depth subject and many people make an entire career of the subject of grounding for reasons beyond just safety concerns. It is a fascinating and often illusive field of endeavor.
The Ultra-Low-Noise LNBF would be a benefit, but keep in mind, when a manufacturer states a low dB noise rating for their LNBF, they are generally referring to the noise that the amplifier within the LNBF itself is generating (so a low noise LNBF is simply a much "quieter" piece of equipment). This rating is not exactly related to external noise issues like TI. All amplifiers (such as an LNBF) generate their own ambient noise, the less noise they generate, the better.
Other factors and ratings are more critical to reducing the interference from other sources. Mentioned previously were the geometry of the dish (a deeper dish or the focal ratio F/D ratio) and side channel rejection of the LNBF. The higher quality of an LNBF often, but not entirely, means that many of the advantages that you are seeking will come hand in hand. Of course, that usually means more expensive equipment. This is not always true, but in a general sense it is fairly accurate.
Your access to the rooftop of your apartment could be a nice benefit in several ways. First of all, it elevates your dish and provides you with a better LOS (Line Of Sight) for the satellite you desire. But, also... it isn't that easy to view from the street and you can conceal it better.
If you have permission to do so, you could conceal your dish as part of an aviary (did I spell that right?) Many people keep doves and pigeons on rooftop aviaries, so you could disguise an enclosure as such and use metal screens to block side interference signals with no one being the wiser about the installation. Obviously, you wouldn't want to block the signal you desire from the satellite, so care in the design of the shielding is necessary.
There are many possibilities for you to incorporate to accomplish the task of reducing the interference from the BTS signal. You may have to use them all. Each one may provide you with a small improvement towards your objective.
I think that I speak for everyone here when I say that I will be extremely interested to hear how it all works out for you and which measures that you utilize to fix this problem. It is very interesting indeed.
I sure hope that you enjoy your membership with us in the world of satellite fun! It is a great hobby and it is a great experience for everyone.
RADAR
to SatelliteGuys!
) state that the dish cannot be larger than a certain size or be visible from the street / neighboring home. Often our forum members develop very creative ways to hide their dish from public view! 
