Enhancing Z-Wave Signal Stability in a Multi-Unit Environment

Hello everyone, I’m hoping to get some insights or tips on improving the reliability of my Z-Wave setup. I’ve been using a Raspberry Pi with RaspberryMatic and an external antenna for my Z-Wave stick. The setup has been working well, but I’ve noticed occasional connection drops, especially with a particular device—a ‘Funk-Schaltaktor mit Leistungsmessung’ HM-ES-PMSw1-Pl.

The RSSI values I’m seeing are fluctuating between -78 / -94 dBm and -163 / -94 dBm. This inconsistency is causing some frustration, especially since I can’t move the central hub closer to the device in question. I’ve considered upgrading the antenna, but there are size constraints due to aesthetic preferences (WAF, as they say).

I’ve wondered if there’s a way to tweak the device’s transmit power. Currently, it’s set to 10mW, and I’m curious if bumping it up to 20mW could help without causing significant interference. I’m not very knowledgeable about hardware modifications, but I’m confident in my ability to replace resistors or capacitors if that’s the solution.

Has anyone successfully increased the transmit power on similar devices? Or perhaps there’s a software-based adjustment I can make? Any advice would be greatly appreciated. I’m also open to other strategies to improve signal stability. Thanks in advance for your help!