[Noisebridge-discuss] SudoRoom Oakland FCC LPFM radio channel search - only 1 freq available under future rules = 96.9 MHz

giovanni_re john_re at fastmail.us
Mon Oct 21 03:24:47 UTC 2013

Sudo room


Degrees, Minutes, Seconds and Decimal Degrees Latitude/Longitude
This utility permits the user to convert latitude and longitude between
decimal degrees and degrees, minutes, and seconds. 

37.810759, 122.267371
=  37° 48' 38.7318",  122° 16' 2.535"


Sun Oct 20 23:17:33 2013
Input options:
EXCLUDES second-adjacent channel spacings EXCLUDES intermediate
frequency (I.F.) spacings

Latitude, Longitude: 37° 48' 38", 122 16' 2"

Google Map: 5.6 km radius (approximate 60 dBu service contour coverage)

CONDITIONAL. The requested latitude and longitude meet the PROPOSED LPFM
spacing requirements for one or more second adjacent and/or intermediate
frequency (I.F.) channels.

These proposed spacing rules are not yet in effect.

Channels Available for LPFM LP100 Stations [Channels 201 to 300,
corresponding to 88.1 to 107.9 MHz]

Channel 245 ---- 96.9 MHz

This analysis does not determine whether an LPFM station at this
location and channel might receive interference within its 60 dBu LPFM
service contour from FM broadcast stations already operating or
authorized in the band from fully spaced locations. LPFM stations must
accept all such interference.

Because the FM database constantly changes, there is no guarantee that
channels represented as "available" will be technically acceptable at
the time of application filing.

Available Channels Interference Analysis

This section considers the acceptable LPFM-use channels listed above,
and determines which of these channels will be less likely to suffer
interference from existing or authorized stations. This analysis only
considers spacing, and assumes that the interfering stations are
operating with the reference facilities for the FM station's class.
While helpful, the results shown below should not take the place of a
thorough analysis of all options by a broadcast consulting engineer.

If interference is possible, the following table will contain: Call Sign
of the interfering station Channel of that station Channel
relationships: Same channel OR First-adjacent channel OR Second-adjacent
channel Actual separation (in km) Minimum Separation for no interference
within the 60 dBu contour (based on reference facilities and flat

Channel 245 KSEG 245 Same channel (cochannel) 115.9 km actual 143.0 km
for no interference

A simple test for potential interference is to tune a radio to the
channel or frequency under consideration, while at the proposed
transmitter site. If a station can be heard, you should expect that
coverage from an LPFM station may be diminished. Interference to the
LPFM station could occur at some future date should the listed FM
station increase its facilities to the maximums permitted for the
station's class.

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