Goto Section: 90.541 | 90.545 | Table of Contents
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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