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How can I increase the transmission power?
Three locations for my smarthomatic sensors seem to be out of range (thick walls in basement). Around the corner the packages are recieved well, but in the door I get garbage, behind the door I receive nothing...

Is there a way to increase the transmitting power of the RFM12B ?

The standard antenna is 1/4 wavelength if I remember correctly. You could try an antenna with the 2x or 4x the length, for base station and/or your device.
The transmitting power can't be increased AFAIK.
You should also try to turn the antenna (both) 90°.

A repeater was once planned, but I still have very little time for the project, and can't develop it right now.

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