UK operators may have an additional source of mobile spectrum coming their way, with Qualcomm reportedly looking for a buyer for its L-band spectrum in the country. The chip giant acquired all 40 MHz in the 1452 MHZ-1492 MHz spectrum for $12.8m in 2008. At the time, mobile broadcasting seemed to be the main interest – the company had also acquired unpaired 700 MHz frequencies in the US to support its MediaFLO mobile TV platform. However, that failed and the main interest in these TDD bands, on both sides of the Atlantic, has subsequently been to augment a primary FDD-LTE network using supplemental downlink (SDL). AT&T has trialled that application in the 700 MHz TDD spectrum, which it acquired from…