Diagnostic Tools
Spectrum analyzers

Many factors impair the successful transmission or reception of a radio signal. A spectrum analyzer is the best tool to determine if there is activity on a frequency . If radio interference is suspected with transmission or reception on the WLAN, turn off the equipment that operates on the same frequency and run the test. The test shows any activity on the frequency and other frequencies the equipment can operate on. This helps to determine frequency changes.

Interference and signal degradation sources include the following:

  • Radio Interference – Because no license is required to operate radio equipment in the 2.4 GHz band, where the WLAN equipment operates, it is possible for other transmitters to broadcast on the same frequency.
  • Electromagnetic Interference – It is possible for EMI to be generated by nonradio equipment operating in close proximity to the WLAN equipment. EMI is more likely to affect the components of the transmitter rather than the transmission. To minimize the possible effects of EMI, it is best to locate the radio equipment as far away from potential sources of EMI as possible. Try to supply conditioned power to the WLAN equipment to lessen the effects of EMI generated on the power circuits as well.
  • Cordless Phones or other 2.4-GHz wireless devices – If the phone is a DS device that uses the same channel as the WLAN equipment, and if the phone is located near the equipment, problems may occur when both are used simultaneously. The following suggestions may help solve the problem:
    • Change the location of the AP or the base of the cordless phone.
    • Try switching to channel 1 or channel 11 on the AP.
    • Use a remote antenna on the client card if that is an option.
    • Operate the phone with the antenna lowered, if possible.
    • Use a 900-MHz phone instead of a 2.4-GHz phone.

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