Open ..\GameData\Kerbalism\Settings.cfg
Change "Signal = true" to "Signal = false"
Reliability = true // component malfunctions and critical failures
Signal = false // communications using low-gain and high-gain antennas
Science = true // science data storage, transmission and analysis
SpaceWeather = true // coronal mass ejections
Automation = true // control vessel components using scripts
Hope this can help you!