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Thread: Do replacement antennas make a difference?

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    Do replacement antennas make a difference?

    Have a Safecom wireless router with a 2dbi antenna, in one of the rooms in the house the signal fluctuates, between excellent and weak, i've switched to 802.11b only just now as i know this boosts the signal and seems to be helping, i've seen some 9dbi Safecom antenna's wil switching to one of these make a difference?

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    Jay
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    Re: Do replacement antennas make a difference?

    make sure you have no other networks on your channel first.
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    Re: Do replacement antennas make a difference?

    Do you mean over lapping networks from others houses etc? No networks show, house is at least 30m from any other houses (live right in the country).

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    Re: Do replacement antennas make a difference?

    its odd that the signal would go up and down like that though.
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    Re: Do replacement antennas make a difference?

    Its through quite a few large walls, i cant think of anything else that would be causing interference. Dont get me wrong its not cutting out etc, just want the full speed for network file transfer etc.

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    Re: Do replacement antennas make a difference?

    microwaves interfere with wifi...

    and just about any high energy stuff like electric farm machinary may cause problems too

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    Re: Do replacement antennas make a difference?

    Quote Originally Posted by UltraMagnus View Post
    microwaves interfere with wifi...

    and just about any high energy stuff like electric farm machinary may cause problems too
    The microwave in the kitchen is directly in line with my router and the room where i have the drop problems with the laptop. However the drop in signal strength doesnt seem to come only when the microwave is on.

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    Senior Member UltraMagnus's Avatar
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    Re: Do replacement antennas make a difference?

    well, microwaves have sheilding specifically designed to reflect microwaves... so it could be causing interference anyway

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    Re: Do replacement antennas make a difference?

    Quote Originally Posted by UltraMagnus View Post
    well, microwaves have sheilding specifically designed to reflect microwaves... so it could be causing interference anyway
    can 100% tell you that if you have an older microwave it will cause problems

    I have 2.4Ghz TV signal sender and when next door use their microwave that Noah must have given them my TV signal looks like some one is using a mobile next to a CRT.
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    Re: Do replacement antennas make a difference?

    If you sig strength is going up and down a lot then and you are not 'sharing with others' then I would say that you definitely have electrical interference coming from some of you electrical gear ( OR YOUR NEIGHBOURS- doesent matter if you are 30 meters away from them or not ) . Examples : tv's , electric fences , fridge stats etc anything that can cause a 'spurious' high frequency signal due to a faulty component. Try changing the router channel to see if that helps . Afraid interference can be a difficult thing to find . Stick another 'machine in place of the 'laptop ' in case that is what is causing the problem. You just have to try different things. - ' process of elimination' .

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    Re: Do replacement antennas make a difference?

    I agree. I think a repeater may do the job as it will boost the signal enough to overcome the interference. Its a pain when this happens, I had huge problems doing a massive hotels pay wireless internet because of this. The bad news was that I had to spend a few thousand on 5ghz wireless repeaters for the place. Later on we found that it was the aircon units on the roof causing the issues
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    Re: Do replacement antennas make a difference?

    Quote Originally Posted by jay_oasis View Post
    can 100% tell you that if you have an older microwave it will cause problems

    I have 2.4Ghz TV signal sender and when next door use their microwave that Noah must have given them my TV signal looks like some one is using a mobile next to a CRT.
    Its not that old, and was a really good one at the time, perhaps 4yrs old. Neighbours i'd imagine wouldnt have any old microwaves and certainly not operating at times i get a lower signal.

    I'll try changing the channel i'm at C11 at the moment.

    I've ordered a 9dBi replacement antenna for £8 so i'll see how that goes, if there is any interference then it should cut through it.

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    Re: Do replacement antennas make a difference?

    The short answer to your question is yes they do sort it, it could be something else (for eg in our block of flats you can recieve 8 different networks, and at least 2 have tv sender) but its easier to just throw more power at it than sort the underlying issue

    What router do you have? if its wone with twin aerials generally one is tx and the other rx, so you'll need 2

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    The late but legendary peterb - Onward and Upward peterb's Avatar
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    Re: Do replacement antennas make a difference?

    Remember that these are passive antennas, and therefore the apparant gain (relative to an isotropic radiator) is obtained by modifying the directional capability, in other words the antennas will be more susceptable to orientation, so to get the best performance from them, the orientation will need to be carefully adjusted (by trial and error).
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    Re: Do replacement antennas make a difference?

    Its this one:

    Safecom SWART2-54125 125Mbps 5 Port ADSL2/2+ 802.11g+

    Only 1 antenna, when you say modifying the direction capability, is that only with multi antenna systems? Mine is perpendicular to the floor, its only a 1 story bungalow.

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    Re: Do replacement antennas make a difference?

    No, a single antenna has a polar radiation/sensitivity pattern, the maximum sensitivity is perpendicular to the antenna's orientation (so a vertical antenna will have maximum sensitivity horizontally) It will be omnidirectional round that vertical axis, but sensitivity will drop off away from the vertical. (An isotropic radiator - which can't be realised in practice - has a spherical radiation pattern - ie, equal in all directions)
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