(a) Each authorization issued to a station licensed under this part will show an emission designator representing the class of emission authorized. The designator will be prefixed by a specified necessary bandwidth. This number does not necessarily indicate the bandwidth occupied by the emission at any instant. In those cases where Sec. 2.202 of this chapter does not provide a formula for the computation of necessary bandwidth, the occupied bandwidth, as defined in part 2 of this chapter, may be used in lieu of the necessary bandwidth.
(b) The maximum authorized single channel bandwidth of emission corresponding to the type of emission specified in Sec. 90.207 is as follows:
(1) For A1A or A1B emissions, the maximum authorized bandwidth is 0.25 kHz. The maximum authorized bandwidth for type A3E emission is 8 kHz.
(2) For operations below 25 MHz utilizing J3E emission, the bandwidth occupied by the emission shall not exceed 3000 Hz. The assigned frequency will be specified in the authorization. The authorized carrier frequency will be 1400 Hz lower in frequency than the assigned frequency. Only upper sideband emission may be used. In the case of regularly available double sideband radiotelephone channels, an assigned frequency for J3E emissions is available either 1600 Hz below or 1400 Hz above the double sideband radiotelephone assigned frequency.
(3) For all other types of emissions, the maximum authorized bandwidth shall not be more than that normally authorized for voice operations.
(4) Where a frequency is assigned exclusively to a single licensee, more than a single emission may be used within the authorized bandwidth. In such cases, the frequency stability requirements of Sec. 90.213 must be met for each emission.
(5) Unless specified elsewhere, channel spacings and bandwidths that will be authorized in the following frequency bands are given in the following table.
Standard Channel Spacing/Bandwidth------------------------------------------------------------------------
Channel
Frequency band (MHz) spacing Authorized
(kHz) bandwidth (kHz)------------------------------------------------------------------------Below 25 \2\................................25-50....................................... 20 2072-76....................................... 20 20150-174..................................... \1\7.5 \1 3\ 20/11.25/6216-220 \5\................................. 6.25 20/11.25/6220-222..................................... 5 4406-512 \2\................................. \1\ 6.25 \1 3\ 20/11.25/6806-809/851-854............................. 12.5 20809-824/854-869............................. 25 20896-901/935-940............................. 12.5 13.6902-928 \4\.................................929-930..................................... 25 201427-1432 \5\............................... 12.5 12.5\3\ 2450-2483.5 \2\.........................Above 2500 \2\..............................------------------------------------------------------------------------\1\ For stations authorized on or after August 18, 1995.\2\ Bandwidths for radiolocation stations in the 420-450 MHz band and
for stations operating in bands subject to this footnote will be
reviewed and authorized on a case-by-case basis.\3\ Operations using equipment designed to operate with a 25 kHz channel
bandwidth will be authorized a 20 kHz bandwidth. Operations using
equipment designed to operate with a 12.5 kHz channel bandwidth will
be authorized a 11.25 kHz bandwidth. Operations using equipment
designed to operate with a 6.25 kHz channel bandwidth will be
authorized a 6 kHz bandwidth. All stations must operate on channels
with a bandwidth of 12.5 kHz or less beginning January 1, 2013, unless
the operations meet the efficiency standard of Sec. 90.203(j)(3).\4\ The maximum authorized bandwidth shall be 12 MHz for non-
multilateration LMS operations in the band 909.75-921.75 MHz and 2 MHz
in the band 902.00-904.00 MHz. The maximum authorized bandwidth for
multilateration LMS operations shall be 5.75 MHz in the 904.00-909.75
MHz band; 2 MHz in the 919.75-921.75 MHz band; 5.75 MHz in the 921.75-
927.25 MHz band and its associated 927.25-927.50 MHz narrowband
forward link; and 8.00 MHz if the 919.75-921.75 MHz and 921.75-927.25
MHz bands and their associated 927.25-927.50 MHz and 927.50-927.75 MHz
narrowband forward links are aggregated.\5\ See Sec. 90.259.\6\ Operations using equipment designed to operate with a 25 kHz channel
bandwidth may be authorized up to a 22 kHz bandwidth if the equipment
meets the Adjacent Channel Power limits of Sec. 90.221.
(6)(i) Beginning January 1, 2011, no new applications for the 150-174 MHz and/or 421-512 MHz bands will be acceptable for filing if the applicant utilizes channels with an authorized bandwidth exceeding 11.25 kHz, unless specified elsewhere or the operations meet the efficiency standards of Sec. 90.203(j)(3).
(i) Beginning January 1, 2011, no new applications for the 150-174 MHz and/or 421-512 MHz bands will be acceptable for filing if the applicant utilizes channels with an authorized bandwidth exceeding 11.25 kHz, unless specified elsewhere or the operations meet the efficiency standards of Sec. 90.203(j)(3).
(ii) Beginning January 1, 2011, no modification applications for stations in the 150-174 MHz and/or 421-512 MHz bands that increase the station's authorized interference contour, will be acceptable for filing if the applicant utilizes channels with an authorized bandwidth exceeding 11.25 kHz, unless specified elsewhere or the operations meet the efficiency standards of Sec. 90.203(j)(3). See Sec. 90.187(b)(2)(iii) and (iv) for interference contour designations and calculations. Applications submitted pursuant to this paragraph must comply with frequency coordination requirements of Sec. 90.175.
(7) Economic Area (EA)-based licensees in frequencies 817-824/862-869 MHz (813.5-824/858.5-869 MHz in the counties listed in Sec. 90.614(c)) may exceed the standard channel spacing and authorized bandwidth listed in paragraph (b)(5) of this section in any National Public Safety Planning Advisory Committee Region when all 800 MHz public safety licensees in the Region have completed band reconfiguration consistent with this part. In any National Public Safety Planning Advisory Committee Region where the 800 MHz band reconfiguration is incomplete, EA-based licensees in frequencies 817-821/862-866 MHz (813.5-821/858.5-866 MHz in the counties listed in Sec. 90.614(c)) may exceed the standard channel spacing and authorized bandwidth listed in paragraph (b)(5) of this section. Upon all 800 MHz public safety licensees in a National Public Safety Planning Advisory Committee Region completing band reconfiguration, EA-based 800 MHz SMR licensees in the 821-824/866-869 MHz band may exceed the channel spacing and authorized bandwidth in paragraph (b)(5) of this section. Licensees authorized to exceed the standard channel spacing and authorized bandwidth under this paragraph must provide at least 30 days written notice prior to initiating such service in the bands listed herein to every 800 MHz public safety licensee with a base station in an affected National Public Safety Planning Advisory Committee Region, and every 800 MHz public safety licensee with a base station within 113 kilometers (70 miles) of an affected National Public Safety Planning Advisory Committee Region. Such notice shall include the estimated date upon which the EA-based 800 MHz SMR licensee intends to begin operations that exceed the channel spacing and authorized bandwidth in paragraph (b)(5) of this section. [60 FR 37263, July 19, 1995, as amended at 67 FR 41860, June 20, 2002; 68 FR 42314, July 17, 2003; 68 FR 54769, Sept. 18, 2003; 69 FR 39867, July 1, 2004; 69 FR 67837, Nov. 22, 2004; 70 FR 21661, Apr. 27, 2005; 70 FR 34693, June 15, 2005; 72 FR 35194, June 27, 2007; 73 FR 34201, June 17, 2008; 77 FR 33979, June 8, 2012; 77 FR 61537, Oct. 10, 2012]