Page 203 - GuideFWA

“3.4.1.2.1 Spectrum Noise Suppression – Broadband” The emission power in
either second alternate channel centered +90 kHz from the center frequency, shall
not exceed a level of 45 dB below the mean output power or -13 dBm, whichever
is the lower power.

“3.4.3.2.3 Harmonic and Spurious Emissions (Radiated)” and also “3.4.2.2.3
Harmonic and Spurious Emissions (Conducted)” The peak power level of any
emissions within the mobile transmit band, measured using a 30 kHz bandwidth
centered 120 kHz or more from the carrier frequency, shall not exceed 45 dB
below the mean carrier output power or -13 dBm, whichever is the lower power.

Thus for frequencies > 90 kHz from a TDMA carrier, IS-137A provides a limit for
mobile terminals of the lower value between 45 dB attenuation or -13 dBm on a 30kHz
channel. For a +30 dBm transmit power, the limit for our case is –15 dBm / 30 kHz
which is equivalent to –35 dBm / 300 Hz.

The following extracts from the Base station spec IS-138A [13] apply:

“3.4.1.2.3 Spectrum Noise Suppression – Broadband” For output powers greater
than 50 W, the emission power in either second alternate channel, centered ?90
kHz from the carrier frequency, shall not exceed a level of 60 dB below the mean
output power.

“3.4.2.2.3.2 Harmonic and Spurious Emissions (Conducted)” and also “3.4.3.2.3.2
Harmonic and Spurious Emissions (Radiated)” The peak power level of
conducted spurious emissions shall not exceed a level of 80 dB below the mean
carrier output power or -13 dBm, whichever is higher, measured in a 1 MHz
bandwidth. For output powers greater than 50 W, the peak power level of any
emissions within the base station transmit band between 1930 - 1990 MHz,
measured using a 30 kHz bandwidth centered 120 kHz or more from the carrier
frequency, shall not exceed a level of 60 dB below the mean carrier output power.

Thus IS-138A provides a limit for base stations of

• 90 – 120 kHz from carrier, the limit is 60 dB attenuation on a 30 kHz channel. For a +47
dBm transmit power -13 dBm / 30kHz equivalent to –33 dBm / 300 Hz.

• > 135 kHz from carrier, the higher value between 80 dB attenuation or –13 dBm in 1
MHz. For a +47 dBm transmit power -13 dBm / 1 MHz equivalent to –48.229 dBm / 300
Hz.

Inter-American Telecommunication Commission 189