In most territories the band was also used by Services Ancillary to Broadcasting (SAB) or Services Ancillary to Programme Making (SAP), both often now referred to as PMSE (Programme Making and Special Events) in the form of professional wireless microphones, radio talkback systems and wireless monitor systems.
The European Parliament approved in May 2010, and Japan in 2012, the change of use of the 800 MHz band making it available for purposes other than broadcasting (television) – e.g. mobile broadband.
[3][4] The reason for the interference problem is that the RF chain in TV-equipment is designed to receive 470–862 MHz (EU channels 21–69) and therefore includes the range of frequencies which the new services are, or will be, using.
Strong LTE base station signals in 800 MHz band, may cause limiting or clipping, that is due to overdrive in antenna amplifiers and/or DTT tuners in e.g. flat panels, set top boxes, USB-tuners and digital video recorders.
Essentially there are two types of interference sources in the 800 MHz band: The LTE base stations and the mobile terminals — handsets, tablets, dongles — which are sometimes close to TV equipment.