nuclearcat wroteNot all extenders and AP's are compatible. Especially because each vendor implement WDS differently.
You might need or dual radio solution, or to purchase at least same chipset+vendor AP and extend this AP.
In some cases decent 802.11n AP will increase coverage much better than extender.
range extenders do not use any sort of WDS and the range extender appears as a regular client to the router, so its not right that they should be compatible because of WDS implementation
as a side note the problem is because of the 830re this range extender is the shitiest in the market i have one installed at my house and i can tell you its causing me all sorts of problems and it has incompatibility issues with lots of routers