Fluctuating wireless signal from router

Discussion in 'Wireless Networking' started by Mike, Apr 20, 2007.

  1. Mike

    Mike Guest

    My laptop has a built-in wireless adapter (Intel PRO 3945ABG), so no external antenna is
    present. There are no nearby networks, at least they are not reported by Network
    Shall I buy a USB dongle ? If so, will I have to disable the wireless card ? Is it
    convenient ?

    <> wrote in message news:...
    > On 19-Apr-2007, "Mike" <> wrote:
    >> I am using Network Stumbler to monitor the signal levels of my Netgear router.
    >> While it is understandable that the level drops every time I position myself
    >> between the
    >> router and my laptop ( average signal value is -58dBm, at a distance of approx. 30
    >> feet ), I cannot explain why, all conditions being equal, sometimes the level drops
    >> down
    >> by a good 10 o 15 dBm, with sudden dips and then recovers after 10 seconds or so.
    >> Again,
    >> the surrounding environment is the same, no microwave ovens kicking in, only a
    >> cordless
    >> phone which is always on, actually. Looks like the router is misbehaving.
    >> Any clues ??
    >> Thanks,


    > You don't say what antenna at the PC end. Often with built in antennas
    > the PC case can screen the antenna, which is also being subject
    > to nearby networks, even if they are on a different channel.
    > If these are strong the compete with the desired signal and affect
    > the automatic gain control.
    > I've found adding a simple foil reflector to my USB wireless adapter,
    > and locating it for maximum pickup, helps to reduce fluctuations
    > of level.
    > By raising gain in one direction you reduce the level of signals
    > from rear and side of the direct path, whilst increasing the
    > desired signal. Which is of course the purpose of reflectors.
    > As a result there can be an improvement of signal quality,
    > and a rise in link rate.
    > USB wireless adapters on the end of a lead can be
    > positioned for best pickup, and most USB adapter utilities
    > show signal strength and quality. Signal quality seems
    > the most important measure, and signal quality falls
    > with multipath propagation.
    Mike, Apr 20, 2007
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