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FCC 90.543
Revised as of October 1, 2006
Goto Year:2005 | 2007
Sec.  90.543   Emission limitations.

   Transmitters designed to operate in 764 776 MHz and 794 806 MHz frequency
   bands must meet the emission limitations in this section.

   (a) The adjacent channel power (ACP) requirements for transmitters designed
   for various channel sizes are shown in the following tables. Mobile station
   requirements apply to handheld, car mounted and control station units. The
   tables specify a value for the ACP as a function of the displacement from
   the channel center frequency and measurement bandwidth. In the following
   tables, “(s)” indicates a swept measurement may be used.

              6.25 kHz Mobile Transmitter ACP Requirements
------------------------------------------------------------------------
                                          Measurement      Maximum ACP
  Offset from center  frequency (kHz)   bandwidth (kHz)   relative (dBc)
------------------------------------------------------------------------
6.25                                              6.25              -40
12.5                                              6.25              -60
18.75                                             6.25              -60
25.00                                             6.25              -65
37.50                                            25.00              -65
62.50                                            25.00              -65
87.50                                            25.00              -65
150.00                                          100.00              -65
250.00                                          100.00              -65
350.00                                          100.00              -65
>400 kHz to 12 MHz                           30 (s)              -75
12 MHz to paired receive band                   30 (s)              -75
In the paired receive band                      30 (s)             -100
------------------------------------------------------------------------

              12.5 kHz Mobile Transmitter ACP Requirements
------------------------------------------------------------------------
                                          Measurement      Maximum ACP
  Offset from center  frequency (kHz)   bandwidth (kHz)   relative (dBc)
------------------------------------------------------------------------
9.375                                             6.25              -40
15.625                                            6.25              -60
21.875                                            6.25              -60
37.50                                            25.00              -60
62.50                                            25.00              -65
87.50                                            25.00              -65
150.00                                             100              -65
250.00                                             100              -65
350.00                                             100              -65
>400 to 12 MHz                               30 (s)              -75
12 MHz to paired receive band                   30 (s)              -75
In the paired receive band                      30 (s)             -100
------------------------------------------------------------------------

               25 kHz Mobile Transmitter ACP Requirements
------------------------------------------------------------------------
                                          Measurement
 Offset from center  frequency  (kHz)      bandwidth       Maximum ACP
                                             (kHz)       relative  (dBc)
------------------------------------------------------------------------
15.625                                            6.25              -40
21.875                                            6.25              -60
37.50                                               25              -60
62.50                                               25              -65
87.50                                               25              -65
150.00                                             100              -65
250.00                                             100              -65
350.00                                             100              -65
>400 kHz to 12 MHz                           30 (s)              -75
12 MHz to paired receive band                   30 (s)              -75
In the paired receive band                      30 (s)             -100
------------------------------------------------------------------------

               150 kHz Mobile Transmitter ACP Requirements
------------------------------------------------------------------------
                                          Measurement
 Offset from center  frequency  (kHz)      bandwidth       Maximum ACP
                                             (kHz)            (dBc)
------------------------------------------------------------------------
100                                                 50              -40
200                                                 50              -50
300                                                 50              -50
400                                                 50              -50
600-1000                                        30 (s)              -60
1000 to receive band                            30 (s)              -70
In the receive band                             30 (s)             -100
------------------------------------------------------------------------

               6.25 kHz Base Transmitter ACP Requirements
------------------------------------------------------------------------
                                          Measurement
 Offset from center  frequency  (kHz)      bandwidth       Maximum ACP
                                             (kHz)            (dBc)
------------------------------------------------------------------------
6.25                                              6.25              -40
12.50                                             6.25              -60
18.75                                             6.25              -60
25.00                                             6.25              -65
37.50                                               25              -65
62.50                                               25              -65
87.50                                               25              -65
150.00                                             100              -65
250.00                                             100              -65
350.00                                             100              -65
>400 to 12 MHz                               30 (s)              -80
12 MHz to paired receive band                   30 (s)              -80
In the paired receive band                      30 (s)             -100
------------------------------------------------------------------------

               12.5 kHz Base Transmitter ACP Requirements
------------------------------------------------------------------------
                                          Measurement
 Offset from center  frequency  (kHz)      bandwidth       Maximum ACP
                                             (kHz)            (dBc)
------------------------------------------------------------------------
9.375                                             6.25              -40
15.625                                            6.25              -60
21.875                                            6.25              -60
37.5                                                25              -60
62.5                                                25              -65
87.5                                                25              -65
150                                                100              -65
250                                                100              -65
350.00                                             100              -65
>400 kHz to 12 MHz                           30 (s)              -80
12 MHz to paired receive band                   30 (s)              -80
In the paired receive band                      30 (s)             -100
------------------------------------------------------------------------

                25 kHz Base Transmitter ACP Requirements
------------------------------------------------------------------------
                                          Measurement
 Offset from center  frequency  (kHz)      bandwidth       Maximum ACP
                                             (kHz)            (dBc)
------------------------------------------------------------------------
15.625                                            6.25              -40
21.875                                            6.25              -60
37.5                                                25              -60
62.5                                                25              -65
87.5                                                25              -65
150                                                100              -65
250                                                100              -65
350                                             100.00              -65
>400 kHz to 12 MHz                           30 (s)              -80
12 MHz to paired receive band                   30 (s)              -80
In the paired receive band                      30 (s)             -100
------------------------------------------------------------------------

                150 kHz Base Transmitter ACP Requirements
------------------------------------------------------------------------
                           Measurement
  Offset from  center       bandwidth           Maximum ACP  (dBc)
    frequency  (kHz)          (kHz)
------------------------------------------------------------------------
100                                  50   -40
200                                  50   -50
300                                  50   -55
400                                  50   -60
600-1000                         30 (s)   -65
1000 to receive band             30 (s)   -75 (continues at 6dB/oct)
In the receive band              30 (s)   -100
------------------------------------------------------------------------

   (b) ACP measurement procedure. The following are the procedures for making
   the transmitter ACP measurements. For all measurements modulate the
   transmitter as it would be modulated in normal operating conditions. For
   time division multiple access (TDMA) systems, the measurements are to be
   made under TDMA operation only during time slots when the transmitter is
   active. All measurements are made at the transmitter's output port. If a
   transmitter has an integral antenna, a suitable power coupling device shall
   be used to couple the RF signal to the measurement instrument. The coupling
   device shall substantially maintain the proper transmitter load impedance.
   The ACP measurements may be made with a spectrum analyzer capable of making
   direct ACP measurements. “Measurement bandwidth”, as used for non-swept
   measurements, implies an instrument that measures the power in many narrow
   bandwidths equal to the nominal resolution bandwidth and integrates these
   powers to determine the total power in the specified measurement bandwidth.

   (1) Setting reference level. Set transmitter to maximum output power. Using
   a spectrum analyzer capable of ACP measurements, set the measurement
   bandwidth to the channel size. For example, for a 6.25 kHz transmitter, set
   the measurement bandwidth to 6.25 kHz; for a 150 kHz transmitter, set the
   measurement bandwidth to 150 kHz. Set the frequency offset of the
   measurement bandwidth to zero and adjust the center frequency of the
   instrument to the assigned center frequency to measure the average power
   level of the transmitter. Record this power level in dBm as the “reference
   power level”.

   (2) Non-swept power measurement. Using a spectrum analyzer capable of ACP
   measurements, set the mesurement bandwidth and frequency offset from the
   assigned center frequency as shown in the tables in  Sec. 90.543 (a) above. Any
   value of resolution bandwidth may be used as long as it does not exceed 2
   percent of the specified measurement bandwidth. Measure the power level in
   dBm. These measurements should be made at maximum power. Calculate ACP by
   substracting the reference power level measured in (b)(1) from the
   measurements made in this step. The absolute value of the calculated ACP
   must be greater than or equal to the absolute value of the ACP given in the
   table for each condition above.

   (3) Swept power measurement. Set a spectrum analyzer to 30 kHz resolution
   bandwidth, 1 MHz video bandwidth and average, sample, or RMS detection. Set
   the reference level of the spectrum analyzer to the RMS value of the
   transmitter power. Sweep above and below the carrier frequency to the limits
   defined in the tables. Calculate ACP by substracting the reference power
   level measured in (b)(1) from the measurements made in this step. The
   absolute value of the calculated ACP must be greater than or equal to the
   absolute value of the ACP given in the table for each condition above.

   (c) Out-of-band emission limit. On any frequency outside of the frequency
   ranges covered by the ACP tables in this section, the power of any emission
   must be reduced below the mean output power (P) by at least 43 + 10log (P)
   dB measured in a 100 kHz bandwidth for frequencies less than 1 GHz, and in a
   1 MHz bandwidth for frequencies greater than 1 GHz.

   (d) Authorized bandwidth. Provided that the ACP requirements of this section
   are met, applicants may request any authorized bandwidth that does not
   exceed the channel size.

   (e) For operations in the 764 to 776 MHz and 794 to 806 MHz bands, all
   emissions including harmonics in the band 1559–1610 MHz shall be limited to
   −70 dBW/MHz equivalent isotropically radiated power (EIRP) for wideband
   signals, and −80 dBW EIRP for discrete emissions of less than 700 Hz
   bandwidth. For the purpose of equipment authorization, a transmitter shall
   be tested with an antenna that is representative of the type that will be
   used with the equipment in normal operation.

   (f) When an emission outside of the authorized bandwidth causes harmful
   interference, the Commission may, at its discretion, require greater
   attenuation than specified in this section.

   [ 70 FR 21666 , Apr. 27, 2005]


Goto Section: 90.541 | 90.545

Goto Year: 2005 | 2007
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