Sec.  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  Sec. 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 an 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  Sec. 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  Sec. 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
    Sec. 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
    Sec. 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  Sec. 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
    Sec. 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]