WRT54G Receive Sensitivity

Discussion in 'Cisco/Linksys Wireless Routers' started by windsurfer, Apr 3, 2006.

  1. windsurfer

    windsurfer Network Guru Member

    I have been using a WRT54G in a 3/4 mile link for about a year now. It worked fine until very recently. I pulled the router out and took it to where I had internet access and burned in the final copy of DD-WRT #22. The new software seemed to work correctly with an indoor very strong connection. The unit was setup in client mode.

    At the same time I took another WRT54G and burned in the same software.

    This weekend, I installed the first router as one end of the 3/4 mile link. It could not find the signal being sent from the other end. I then switched to the second router and it worked just fine.

    Does anyone know what might make a WRT54G V3 loose receive sensitivity? This unit did get some rain water into its box once or twice before I got it sealed correctly but it worked for 6 months after that.

    Here is a picture of the setup before I sealed the box.


  2. RTSAnime

    RTSAnime Network Guru Member

    are you sure you reconnected the wires properly?
    Did you set the antenna diversity to the proper side?
  3. windsurfer

    windsurfer Network Guru Member

    Yes it was connected correctly. The box is built in such a way that you can only connect to the left antenna connection. The software was set to left only.

    As a test, I took the two routers and set them side by side in a window. They had their factory antenna connected. One router could see two distant APs. The other could see none. The router that could see the distant APs was set to left.

    I then set the router that does not work well, to auto, thinking that maybe there was somethig wrong with the left antenna. It still did not work so what ever is affecting the router affects both left and right antenna.

  4. windsurfer

    windsurfer Network Guru Member

    I think I found the source of the problem. This morning, I opened the box and found a water stain on the circuit board. It starts next to the silver box and goes up to the cable launch for the left antenna connector. It also covers the large IC next to the silver box.

    I plan to clean this up and see if that fixes the receive sensitivity.

  5. windsurfer

    windsurfer Network Guru Member

    After cleaning and more testing, the unit does work but it is about 10 to 15 db down on receive sensitivity. This router was used for about a year before it got wet. I replaced the housing with a sprinkler box and now things are dry. This weekend my replacement router has also lost receive sensitivity. I took the router out and it appears dry in side. I can seen no reason for the signal loss.

    I am using WRT54G version 1-4 routers. Do these things loose sensitivity over time?
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