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Almost certainly they are microwave links to another tower. It is usually cheaper to link telecoms bases together by radio than to install lots of cables between them, especially if it would mean digging up roads or going through peoples property. The 'drums' are parabolic dishes with a weather screen in front of them to protect the electronic parts.
The tower itself is to lift the dishes clear of obstructions. Microwave signals travel in straight lines and are easily stopped by obstructions (buildings, trees etc.) along the path between transmitter and receiver. The tower gives then extra height to keep them clear of the obstructions and in some cases so they can see a little further over the horizon.
it provide me internet and phone call
and give advertisement job
how to know there are 11 or 12 dishes antenna some are circle etc
i dnt understand how it was design and repair?
Repairs to that kind of equipment requires special knowledge and test equipment (spectrum analyzer, modulation analyzers etc.) it has to be done in lab conditions.
Each dish focusses its signal along a narrow beam to another dish some distance away. They make up a 'mesh' with each tower being a node within it. The dishes point to the adjacent towers and some signals will be routed directly from one distant tower to another one through the one you can see.
You are asking a lot of questions, much of them unrelated ( what is this ? who makes this ? what cable is used ? how to repair, etc...). You really need to make some previous researches by yoursef and try to start from a point not so trivial. It is supposed that persons here have a minimum technical background, even newbie, but not totally outsider.
The Wiki page brings a lot of useful information. For instance, the structure in the frontal area of the parabolic antenna that you overlined is called Radome, whose main purpose is to protect the dish, the reflector and the feeder of rains and dirt that may eventually sedment on the parts of the set.
simple Answer: PATCH ANTENNA with array... using high power .... those antenna used superstate for high directivity and they send the carrier frequency....some time Operators used high pole antenna for omni directional radiation.
You are asking a lot of questions, much of them unrelated ( what is this ? who makes this ? what cable is used ? how to repair, etc...). You really need to make some previous researches by yoursef and try to start from a point not so trivial. It is supposed that persons here have a minimum technical background, even newbie, but not totally outsider.
The Wiki page brings a lot of useful information. For instance, the structure in the frontal area of the parabolic antenna that you overlined is called Radome, whose main purpose is to protect the dish, the reflector and the feeder of rains and dirt that may eventually sedment on the parts of the set.
Repairs to that kind of equipment requires special knowledge and test equipment (spectrum analyzer, modulation analyzers etc.) it has to be done in lab conditions.
Each dish focusses its signal along a narrow beam to another dish some distance away. They make up a 'mesh' with each tower being a node within it. The dishes point to the adjacent towers and some signals will be routed directly from one distant tower to another one through the one you can see.
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