FCC 97.307 Rules govening transmitter bandwidth



FCC 97.307


Home Up


Sec. 


97
.307  
Emission standards.


 


   (a) No amateur
station transmission
shall occupy more
bandwidth than


   necessary for
the information rate
and emission type
being transmitted,
in


   accordance
with good amateur
practice.


 


   (b) Emissions
resulting from
modulation must be
confined to the band
or


   segment available
to the control
operator.
Emissions outside
the necessary


   bandwidth must
not cause splatter
or keyclick
interference to
operations on


   adjacent
frequencies.


 


   (c) All
spurious emissions
from a station
transmitter must be
reduced to the


   greatest
extent practicable.
If any spurious
emission, including
chassis or


   power line
radiation, causes
harmful interference
to the reception of


   another radio
station, the
licensee of the
interfering amateur
station is


   required to
take steps to
eliminate the
interference, in
accordance with


   good
engineering
practice.


 


   (d) For
transmitters
installed after
January 1, 2003, the
mean power of any


   spurious
emission from a
station transmitter
or external RF power
amplifier


   transmitting
on a frequency below
30 MHz must be at
least 43 dB below
the


   mean power of
the fundamental
emission. For
transmitters
installed on or


   before January
1, 2003, the mean
power of any
spurious emission
from a


   station
transmitter or
external RF power
amplifier
transmitting on a


   frequency
below 30 MHz must
not exceed 50 mW and
must be at least 40
dB


   below the mean
power of the
fundamental
emission. For a
transmitter of mean


   power less
than 5 W installed
on or before January
1, 2003, the
attenuation


   must be at
least 30 dB. A
transmitter built
before April 15,
1977, or first


   marketed
before January 1,
1978, is exempt from
this requirement.


 


   (e) The mean
power of any
spurious emission
from a station
transmitter or


   external RF power
amplifier
transmitting on a
frequency between
30–225 MHz


   must be at least
60 dB below the mean
power of the
fundamental. For a


   transmitter
having a mean power
of 25 W or less, the
mean power of any


   spurious emission
supplied to the
antenna transmission
line must not exceed


   25  µW and must
be at least 40 dB
below the mean power
of the fundamental


   emission, but
need not be reduced
below the power of
10  µW. A
transmitter


   built before
April 15, 1977, or
first marketed
before January 1,
1978, is


   exempt from this
requirement.


 


   (f) The following
standards and
limitations apply to
transmissions on the


   frequencies
specified in  Sec.


97
.305(c)
of this part.


 


   (1) No
angle-modulated
emission may have a
modulation index
greater than 1


   at the highest
modulation
frequency.


 


   (2) No non-phone
emission shall
exceed the bandwidth
of a communications


   quality phone
emission of the same
modulation type. The
total bandwidth of


   an independent
sideband emission
(having B as the
first symbol), or a


   multiplexed image
and phone emission,
shall not exceed
that of a


   communications
quality A3E
emission.


 


   (3) Only a RTTY
or data emission
using a specified
digital code listed
in


    Sec.


97
.309(a)
of this part may be
transmitted. The
symbol rate must not
exceed


   300 bauds, or for
frequency-shift
keying, the
frequency shift
between mark


   and space must
not exceed 1 kHz.


 


   (4) Only a RTTY
or data emission
using a specified
digital code listed
in


    Sec.


97
.309(a)
of this part may be
transmitted. The
symbol rate must not
exceed


   1200 bauds, or
for frequency-shift
keying, the
frequency shift
between mark


   and space must
not exceed 1 kHz.


 


   (5) A RTTY, data
or multiplexed
emission using a
specified digital
code


   listed in  Sec.


97
.309(a)
of this part may be
transmitted. The
symbol rate must


   not exceed 19.6
kilobauds. A RTTY,
data or multiplexed
emission using an


   unspecified
digital code under
the limitations
listed in  Sec.


97
.309(b)
of this


   part also may be
transmitted. The
authorized bandwidth
is 20 kHz.


 


   (6) A RTTY, data
or multiplexed
emission using a
specified digital
code


   listed in  Sec.


97
.309(a)
of this part may be
transmitted. The
symbol rate must


   not exceed 56
kilobauds. A RTTY,
data or multiplexed
emission using an


   unspecified
digital code under
the limitations
listed in  Sec.


97
.309(b)
of this


   part also may be
transmitted. The
authorized bandwidth
is 100 kHz.


 


   (7) A RTTY, data
or multiplexed
emission using a
specified digital
code


   listed in  Sec.


97
.309(a)
of this part or an
unspecified digital
code under the


   limitations
listed in  Sec.


97
.309(b)
of this part may be
transmitted.


 


   (8) A RTTY or
data emission having
designators with A,
B, C, D, E, F, G, H,


   J or R as the
first symbol; 1, 2,
7 or 9 as the second
symbol; and D or W
as


   the third symbol
is also authorized.


 


   (9) A station
having a control
operator holding a
Novice or Technician
Class


   operator license
may only transmit a
CW emission using
the international


   Morse code.


 

 


   (10) A station
having a control
operator holding a
Novice Class
operator


   license or a
Technician Class
operator license and
who has received
credit


   for proficiency
in telegraphy in
accordance with the
international


   requirements may
only transmit a CW
emission using the
international Morse


   code or phone
emissions J3E and
R3E.


 


   (11) Phone and
image emissions may
be transmitted only
by stations located


   in ITU Regions 1
and 3, and by
stations located
within ITU Region 2
that are


   west of 130 °
West longitude or
south of 20 ° North
latitude.


 


   (12) Emission F8E
may be transmitted.


 


   (13) A data
emission using an
unspecified digital
code under the
limitations


   listed in  Sec.


97
.309(b)
also may be
transmitted. The
authorized bandwidth
is


   100 kHz.


 


   [


54 FR 25857

, June 20, 1989; 


54 FR 30823

, July 24, 1989, as
amended at 


54 FR 39537

,


Sept. 27, 1989; 


60 FR 15688

, Mar. 27, 1995; 


65 FR 6550

, Feb. 10,


   2000; 


69 FR 24997

, May 5, 2004]