Manual Part 22

1365 Adams Court, Menlo Park, CA 94025
Wireless Link, Model No: FWT-8100
FCC ID: NJIFW8100
Date of Test: April 18 to April 23, 2001
Report # 20451372 17 of 91 FCC Part 22
5.0 Audio Filter Characteristics
FCC 22.915(d)
For mobile stations, these signals must be attenuated, relative to the level at 1 kHz, as follows:
(i) In the frequency ranges of 3.0 to 5.9 kHz and 6.1 to 15.0 kHz, signals must be attenuated by at least 40
log (f/3) dB, where f is the frequency of the signal in kHz.
(ii) In the frequency range of 5.9 to 6.1 kHz, signals must be attenuated at least 35 dB.
(iii) In the frequency range above 15 kHz, signals must be attenuated at least 28 dB.
5.1 Test Procedure
The test was performed according to the block diagram shown below.
On that block diagram, the HP 3885A spectrum analyzer having the tracing generator, and the Marconi 2955A
Radio Communication Test Set having an output of a FM demodulator, are used. After the calibration was made
(the -20 dBm reading of the spectrum analyzer corresponds to the 9 kHz deviation) the spectrum analyzer was
set to scan the frequency from 300 Hz to 30 kHz, with the same audio input level as described above, and with
compressor OFF and expander OFF.
The audio filter response was plotted directly from the spectrum analyzer (Refer to Plots # 5.1.a, 5.1.b).
Transmitter
RF out
Audio in
Marconi
2955A Test Set
Spectrum Analyzer
HP 3588A
FM demodul.
RF in
Audio inAudio out