|
Cordless Phone Interference |
|
|
|
|
Written by Jim Geier
|
|
Saturday, 17 March 2007 |
|
In addition to microwave ovens, cordless phones cause significant interference in the 2.4GHz band (i.e., 802.11b and 802.11g). To see what interference from a 2.4GHz cordless phone looks like (implementing FHSS), look at the screen shot of a spectrum analyzer below, This measurement was taken within a few feet of the cordless phone handset, and the signal is present during the entire phone call. An issue with FHSS, is that it spreads across the entire band, as you can see in the image. As a result, it’s not possible to tune wireless LAN access points away from FHSS interference. At least the amplitude of FHSS signals appear to be lower than those from operating microwave ovens.
|
|
