The radiocommunication built into modern laptops (e.g. bluetooth used for wireless mouse devices etc.; WLAN) can seriously disturb observations with the 30-m telescope. Therefore all visitors to the observatory must ensure that all radio connections are switched off before getting to the telescope.
If you are not sure how to do that, please ask our computer staff. We remind you that also mobile telephones must be kept switched off all the time at the observatory. The negative impact of such interference is documented in the IRAM Newsletter 54 (December 2002).