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SECTION 5 MEASUREMENT
5.1.2 Measuring 12 dB SINAD sensitivity
The SINAD sensitivity is indicated by the output level of the signal generator when the distortion rate reaches the
determined value (–12 dB in the 400 MHz zone of Japan) by reducing the output level of the signal generator while
measuring the distortion (correctly distortion + noise) of the receiving modulation output of the typically modulated
signal.
(1) Setup
Fig. 5-2. Measuring 12 dB SINAD Sensitivity
(2) Measurement procedure
STEP PROCEDURE
1. Set the MG3641A/MG3642A frequency to 465.05 MHz.
2. Set the MG3641A/MG3642A frequency deviation to 70 % (3.5 kHz for maximum frequency deviation 5
kHz) of the specified maximum frequency deviation. Then, set the internal modulation frequency to 1 kHz.
3. Set the MG3641A/MG3642A to a sufficiently high output (ordinarily 30 dB
µ
or more) and apply it to the
receiver.
4. Turn off the squelch of the receiver, synchronize the receiver with receiving frequency 465.05 MHz (so that
the reading value of the distortion rate and noise meter is the maximum), then adjust the volume adjust
volume of the receiver so that the rated output of the receiver is obtained according to the indicator of the
distortion rate and noise meter.
5. Adjust the MG3641A/MG3642A output level so that the indicator of the distortion rate and noise meter is
set to –12 dB.
6. The reading value of the MG3641A/MG3642A output level indicator is a 12 dB SINAD sensitivity in step
5.
MG3641A/MG3642A
DA FM RX DL LM
(465.05MHz)
Pseudo-
antenna
FM
receiver
Standard
pseudo-load
Distortion rate
and noise meter