I had poor wireless internet connection in my house due to an RSJ (metal support beam in the ceiling) and wanted to boost the signal or add an extra extender for the rest of the house. I had seen extenders for around £50 in an electronics retailer which seemed quite pricey so I thought why not just use an old wireless Router to do the same which was actually pretty simple.
I have only tried this once with a BT Voyager 2091 as the Extender and a BT Home Hub 2.0 as the Primary Router and couldn’t say if this technique works for other ISP's or other models of Router. You will also need an Ethernet Cable long enough to reach to the new Extender location (preferably beside a power point for the Extender).
Step 1: Accessing The Extender Settings
Connect the router that you are going to use as the Extender (BT Voyager 2091) to a PC via the Ethernet Cable then gain access to its Router Settings /Configuration.
This can be done by entering the Routers IP address into the address bar of your internet browser in this case it is http://192.168.1.1/ but this may be different for other Routers.
If so disconnect the Primary Router from the phone line then connect the Extender Router to the phone line.
Do a Google search using the Extender for My IP Address the first site will normally do then copy and paste the number it gives in to you address bar then hit enter. You should now have access to your Extender Settings.