Goto Section: 90.205 | 90.209 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 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
(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
A—Amplitude modulation, double sideband with identical information on
J—Single sideband with suppressed carrier.
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
1—Digital modulation, no subcarrier.
2—Digital modulation, modulated subcarrier.
(3) The third symbol indicates the type of transmitted information.
A—Telegraphy for aural reception.
B—Telegraphy for machine reception.
D—Data, telemetry, and telecommand.
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.
(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]
Goto Section: 90.205 | 90.209
Goto Year: 2020 |
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