Could a wireless IP phone system cause noise in this range?
I'm working with a test device that is built to pick up signals in the 50-500 kHz range and the device is now picking up "external noise" that severely affects the reliability of the tests.
The noise seem to have a periodic nature of 30-32 Hz and is nearly attenuated in one direction as well..
The user claims that the noise appeared whenever they installed a Cisco IP phone system. They are using 7925 wireless phones.