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.


[[Page 459]]


    (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 F3Y emission 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]

    Effective Date Note: At  62 FR 18927 , Apr. 17, 1997, Sec. 90.207 was 
amended by revising paragraphs (b) and (d) and the first sentence of 
paragraph (l), effective Oct. 17, 1997.