Bluetooth Reciver Intermodulaton- and Blocking Performance tests fail with every DUT when using an external signal generator to generate the interferer signals. This most probably is related to harmonics in the 2.4 GHz ISM band that is used for Bluetooth.
How can that issue be solved?
Overview Bluetooth Reciver Testcases:
When the used signal generator for the interferer signal has a not sufficient hormonic suppression the receiver measurments can fail because of harmonic signals in the 2.4 GHz band.
The use of a notch filter that rejects the 2.4 GHz ISM band ( 2400 -2484 MHz) in the RF path of the generator that produce the interferer signal will solve this issue.
Rohde & Schwarz do not offer this kind of filters but they can be sourced at suppliers for filters e.g. from Wainright. https://www.wainwright-filters.com/standard-filters/band-reject-notch-filters
