With the final transition of television from analog to digital soon upon us, the FCC has scheduled for consideration at its November meeting two items that will address the use of the television spectrum after the transition – one designed to improve television reception, and the other viewed by television broadcasters as a threat to that reception.  The potential positive development is Distributed Transmission Service ("DTS").  The other proposal – which is far more controversial – is the proposal to authorize "white spaces devices" that operate wireless devices within the portion of the spectrum that will still be used by television stations after the transition.

DTS is the proposal that would allow television stations to use more than one transmitter to reach its service area.  Like the use of FM on-channel boosters, a DTS system would permit stations to use multiple transmitters located throughout their service area, each broadcasting on the same channel, but operating at a lower power than the traditional television station which usually operates from a single high-powered transmitter.  The idea is that, in digital, signals distributed from lower power transmitters spread throughout the service area might be less susceptible to signal impediments from terrain and building obstacles than would a single high-power transmitter.  The FCC proposed adoption of this system several years ago with little opposition, but it has languished.  Some have suggested that the experience in Wilmington, where some people who lived far from the center of the market were having over-the-air reception problems, gave new impetus to DTS as one way to provide better service to these more remote areas.


Continue Reading Issues on the Post-Transition Use of the Television Spectrum – White Spaces and Distributed Transmission Service (DTS)

At last Tuesday’s FCC meeting, the Commission adopted a controversial order, over the objection of two Commissioners, that could limit the processing of some applications for improvements by some full power FM stations, and would restrict translator applications, all in the name of encouraging Low Power FM (LPFM) stations to provide outlets for expression by groups that cannot get access to full-power radio stations (see our summary of that action here).  In recent weeks, two ideas have received some publicity providing an alternative outlet for these prospective local broadcasters – and both provide a simple solution (one more immediate and ad hoc than that other), but both leading to the same result – why not just extend the FM band by using TV channel 6?

The current FM band begins at 88.1 MHz, a channel that is actually immediately adjacent to TV Channel 6.  The FCC has for years restricted operations of noncommercial FM stations (which operate from 88.1 to 91.9 on the FM dial) in areas where there are Channel 6 TV stations in order to prevent the radio stations from creating interference to the reception of the TV stations.  That’s while you will often find fewer noncommercial stations, or ones with weaker coverage, in communities that have TV Channel 6 licensees.  TV stations use an FM transmission system for their audio.  Thus, you will also find that most FM receivers (especially ones without digital tuners) will pick up the audio from TV channel 6 if tuned all the way to the left of the dial.  The short-term solution to expanding the FM band came from one broadcaster who noted that fact.


Continue Reading Who Needs LPFM? – Why Not Just Expand the FM Dial?