The US regulator, the FCC, will kick off its third auction of millimeter wave (mmWave) spectrum on December 10, but the large cable operators are sitting this one out, which may prevent prices going too high. All the national MNOs are on the list of those registered to participate in Auction 103, which will offer a massive 2,400 MHz of spectrum across the 37 GHz and 39 GHz bands, and a further 1,000 MHz in the 47 GHz band. However, Comcast, Charter and Altice USA, despite their high interest in adding mobile and small cell services to their cable networks, are not on the list. So far, prices in the mmWave auctions have been far lower than for spectrum in…