§  90.207   Types of emissions.

   Unless specified elsewhere in this part, stations will be authorized
   emissions as provided for in paragraphs (b) through (n) of this
   section.

   (a) Most common emission symbols. For a complete listing of emission
   symbols allowable under this part, see §  2.201 of this chapter.

   (1) The first symbol indicates the type of modulation on the
   transmitter carrier.

   A—Amplitude modulation, double sideband with identical information on
   each sideband.

   F—Frequency modulation.

   G—Phase modulation.

   J—Single sideband with suppressed carrier.

   P—Unmodulated pulse.

   W—Cases not covered above, in which an emission consists of the main
   carrier modulated, either simultaneously or in a pre-established
   sequence, in a combination of two or more of the following modes:
   amplitude, angle, pulse.

   (2) The second symbol indicates the type of signal modulating the
   transmitter carrier.

   0—No modulation.

   1—Digital modulation, no subcarrier.

   2—Digital modulation, modulated subcarrier.

   3—Analog modulation.

   (3) The third symbol indicates the type of transmitted information.

   A—Telegraphy for aural reception.

   B—Telegraphy for machine reception.

   C—Facsimile.

   D—Data, telemetry, and telecommand.

   E—Voice.

   N—No transmitted information.

   W—Combination of the above.

   (b) Authorizations to use A3E, F3E, or G3E emission also include the
   use of emissions for tone signals or signaling devices whose sole
   functions are to establish and to maintain communications, to provide
   automatic station identification, and for operations in the Public
   Safety Pool, to activate emergency warning devices used solely for the
   purpose of advising the general public or emergency personnel of an
   impending emergency situation.

   (c) The use of F3E or G3E emission in these services will be authorized
   only on frequencies above 25 MHz.

   (d) Except for Traveler's Information stations in the Public Safety
   Pool authorized in accordance with §  90.242, only J3E emission will be
   authorized for telephony systems on frequencies below 25 MHz.

   (e) For non-voice paging operations, only A1A, A1D, A2B, A2D, F1B, F1D,
   F2B, F2D, G1B, G1D, G2B, or G2D emissions will be authorized.

   (f) For radioteleprinter operations that may be authorized in
   accordance with §  90.237, only F1B, F2B, G1B or G2B emissions will be
   authorize above 25 MHz, and A1B or A2B emissions below 25 MHz.

   (g) For radiofacsimile operations that may be authorized in accordance
   with §  90.237, only F3C or G3C emissions will be authorized above 25
   MHz, and A3C emissions below 25 MHz.

   (h) [Reserved]

   (i) For telemetry operations, when specifically authorized under this
   part, only A1D, A2D, F1D, or F2D emissions will be authorized.

   (j) For call box operations that may be authorized in accordance with
   §  90.241, only A1A, A1D, A2B, A2D, F1B, F1D, F2B, F2D, G1B, G1D, G2B,
   G2D, F3E or G3E emissions will be authorized.

   (k) For radiolocation operations as may be authorized in accordance
   with subpart F, unless otherwise provided for any type of emission may
   be authorized upon a satisfactory showing of need.

   (l) For stations in the Public Safety and Industrial/Business Pools
   utilizing digital voice modulation, in either the scrambled or
   unscrambled mode, F1E or G1E emission will be authorized. Authorization
   to use digital voice emissions is construed to include the use of F1D,
   F2D, G1D, or G2D emission subject to the provisions of §  90.233.

   (m) For narrowband operations in a 3.6 kHz maximum authorized bandwith,
   any modulation type may be used which complies with the emission
   limitations of §  90.209.

   (n) Other emissions. Requests for emissions other than those listed in
   paragraphs (c) through (e) of this section will be considered on a
   case-by-case basis to ensure that the requested emission will not cause
   more interference than other currently permitted emissions.

   [ 49 FR 48711 , Dec. 14, 1984, as amended at  50 FR 13606 , Apr. 5, 1985;
    50 FR 25240 , June 18, 1985;  52 FR 29856 , Aug. 12, 1987;  54 FR 38681 ,
   Sept. 20, 1989;  60 FR 15252 , Mar. 23, 1995;  60 FR 37263 , July 19, 1995;
    62 FR 2039 , Jan. 15, 1997;  62 FR 18927 , Apr. 17, 1997;  64 FR 36270 ,
   July 6, 1999;  72 FR 35194 , June 27, 2007]

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