LPFM's in Boston
Tue Jan 7 16:31:58 EST 2014
On 1/7/2014 3:21 PM, Don wrote:
> Was 94.9 and 102.9 REALLY available?
> Did each of these orgnaizations cough up the $5k to $12k to prepare an
> Seems like a big layout for a "maybe" application.
I can't speak to whether each of those organizations spent that much
money. It only takes $5-12k if you're hiring a professional consultant
at the top of the scale. If you have some engineering chops of your own
and the ability to run some fairly simple studies and read through the
FCC rules, it's possible to craft an LPFM application for far less.
As for whether 94.9 and 102.9 (and 96.5) are available? Yes, thanks to
some changes in the FCC's rules, some of them dictated by Congress. It
is now possible to put an LPFM on a channel third-adjacent to a nearby
full-power station, thanks to Congressional legislation that eliminated
third-adjacent spacing restrictions between LPFM and most full-power
stations. In Boston, however, there are no available third-adjacent
channels, as you'll see if you step through the dial. The only such
channels that might have worked would have been 96.3 and 100.1, but they
had existing class D occupants (W242AA and WBRS, respectively), and the
spacing to those precluded any co-channel LPFM usage in Boston.
The FCC also decided to accept "D/U ratio" showings of no
second-adjacent interference. An LPFM applicant can show that if a
full-power second-adjacent station delivers, let's say, 90 dBu of signal
at its proposed LPFM site, that there is no point at which the LPFM will
deliver 130 dBu (90 dBu + the 40 dB ratio between the desired and
undesired signal) at which there is any population. If it can make that
showing, it can be granted a waiver of second-adjacent spacing rules.
It happens that 94.9, 102.9 and 96.5 are all channels for which it's at
least theoretically possible to make such a showing at points within
greater Boston, which is why there were applicants on those channels.
I analyzed all the greater Boston LPFM apps (and many more from around
the region) in a special edition of NERW for subscribers back in November:
More information about the Boston-Radio-Interest