After some recent network improvements at the house, I discovered the new router was causing interference with my old phone system.  Rather than replace the phone system with a newer one that is both technologically better and feature poorer, I decided to stick with the current one and change what I could.

Figuring that the new router is only causing interference where the old one did not must be because it the signal is somehow stronger.  Fortunately, I’m running dd-wrt on my routers so I there’s more tweakability than with stock firmware.  And fortunately one of the things you can tweak is the “TX Power”.  The default value for TX Power for the 2.4 Ghz antenna was 71 (out of a reported 1000?  that doesn’t seem right).  I changed it to 60 and the warblyness in the cordless phone went away mostly.  I can still get interference if I walk to the router and touch the phone’s antenna to the router.  Since that isn’t something I need to do to use the phone normally, I think I’m good now.

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