Axcera-430B Type Acceptance Report
Test Report
February 2004
4-7
Note: The HP modulation analyzer provides a calibrated audio output level that is
suitable for determining the FM deviation. De-emphasis can be switched on or
off for this measurement; it was switched off for the purposes of these tests. For
the distortion measurements, the de-emphasis was switched on (pursuant to
73.687.b.3[I] of the FCC rules).
4.2.7 AM and FM Noise
The AM noise and the FM noise were recorded using the test setup shown in Figure
4-5.
Dotted lines were used for the AM tests and solid lines were used for the FM tests with
the following results:
•
AM noise: -56 dB
•
FM noise: -69 dB
4.3 Occupied Bandwidth
Using the test setup in Figure 4-6, with the transmitter operating at maximum power,
photographs of the transmitter-occupied bandwidth spectrum were taken and are shown
in Figures 4-7 and 4-8.
Figure 4-6. Test Setup for Occupied Bandwidth Spectrum Analysis
Note: Using the test setup shown in Figure 4-1, the visual modulation was
adjusted to 87.5% at white with the modulated staircase waveform and the
aural deviation adjusted to
±±
25 kHz (100%) with the 400-Hz audio tone.
TEK
S/B Adp.
Transmitter
Under
Test
30 dB
Attenuator
TEK
Spectrum Analyzer
Amber 3501
Audio Signal
Generator
VIDEO
LO
Audio Input
15 kHz Audio
20 dB
Attenuator
