Electronic Filing
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MB E-Filing Site
These FCC/MB forms MUST be electronically filed:
FCC Forms 301, 301-CA, 302-CA, 302-FM, 302-DTV, 302-TV, 303-S, 314,
315, 316, 318, 319, 323, 323-E, 337, 340, 346, 347, 349,
350, 381
EEO Forms 395-A and 395-B have been suspended by
Commission Order FCC 01-34.
CDBS Users Guide or call (202)-418-2662
CDBS System Status
Call Sign Reservations & Authorizations
for broadcast
station call signs
Antenna Structure Registration via ULS
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Easy, one-stop access to all online U.S. Federal Government resources
www.USA.gov
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FM Station Classes and Service
Contours
The following table lists the various classes of FM stations, the
reference facilities for each station class, and the protected and
city grade contours for each station class. A
contour may be visualized by imagining a rough circle surrounding
a transmitter site at some distance, where the circle represents a certain field
strength value, with greater radio field strengths inside, and lesser radio field
strengths outside. The distances to the contours herein were derived
using the maximum effective radiated
power (ERP) and antenna height above average terrain (HAAT)
combination permitted for each station class (see Section 73.211), and assumes uniform (flat) terrain in all
directions. In practice, the distances to a specified contour for a given
FM station in a given direction will vary from the listed value depending on
the effects of terrain in that direction.
The listed values are for commercial FM
stations. This data also holds true for noncommercial educational stations,
except that the 70 dBu city grade requirement of 47 CFR Section
73.315(a) does not apply to
noncommercial educational stations in the portion of the FM band
reserved for noncommercial educational use (88.1 to 91.9 MHz).
Please note, however, that the 60 dBu contour must encompass 50%
portion of the community of license. In addition, please note that the
distances to reserved band noncommercial educational
stations' protected contours for Class B and Class B1 stations
are the same as the distances listed for Class C2 and Class C3 stations,
respectively, since the protected contour for all reserved band stations
is 60 dBu ( 1.0 mV/m ).
For different combinations of ERP and HAAT, you may determine the
applicable FM station class by using our FM propagation
curves calculations program and comparing the result with the
table below. Be sure to use the 60 dBu F(50,50) contour, since it is
on the basis of that contour (not the 70 or
54 or 57 dBu contour) that equivalence between facilities is
determined.
In addition, if you know the station class and the antenna height
above average terrain (HAAT), you may use our
FMpower
program to calculate the effective radiated power (ERP)
needed to achieve maximum coverage for the selected station
class. This program will also advise whether the station class is
valid in the selected state.
[ For FM minimum separation requirements, especially for
commercial FM stations, please see our document FM
Radio Station Spacing Standards. ]
FM Station
Class |
Reference
(Maximum) Facilities for Station Class (see 47 CFR Section
73.211) ERP (in kW) / HAAT (in meters) |
FM Protected or
Primary Service Contour
|
Distance to
Protected or Primary Service Contour (km) |
Distance to 70 dBu
(or 3.16 mV/m) City Grade or Principal Community Coverage Contour
(see 47 CFR Section 73.315) (km) |
dBu | mV/m |
Class
A
|
6.0 kW / 100 meters |
60 dBu |
1.0 mV/m |
28.3 km |
16.2 km |
Class
B1
|
25.0 kW / 100 meters |
57 dBu |
0.71 mV/m |
44.7 km |
23.2 km |
Class
B
|
50.0 kW / 150 meters |
54 dBu |
0.50 mV/m |
65.1 km |
32.6 km |
Class C3
|
25.0 kW / 100 meters |
60 dBu |
1.0 mV/m |
39.1 km |
23.2 km |
Class
C2
|
50.0 kW / 150 meters |
60 dBu |
1.0 mV/m |
52.2 km |
32.6 km |
Class
C1
|
100.0 kW / 299 meters |
60 dBu |
1.0 mV/m |
72.3 km |
50.0 km |
Class
C0 (C-zero)
|
100.0 kW / 450 meters |
60 dBu |
1.0 mV/m |
83.4 km |
59.0 km |
Class
C
|
100.0 kW / 600 meters |
60 dBu |
1.0 mV/m |
91.8 km |
67.7 km |
Notes: Class B and B1 stations are authorized only
in Zones I and I-A,
which include the following states and areas: CA (south of
40° latitude), CT,
DC, DE, IL, IN, MA, MD, coastal ME, MI (south of 43.5°
latitude), NJ, NH (south of 43.5° latitude), NY (south of 43.5°
latitude), OH, PA, PR, RI,
northern & eastern VA, VI, VT (south of 43.5° latitude),
southeastern WI, WV.
Class C, C0, C1, C2, and C3 stations are not authorized in Zones I or
I-A, but may be authorized elsewhere. See Section
73.205 for the exact zone boundaries. You may also use FMpower
to determine whether a particular class is valid in a given
state.
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