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FM Receivers
85
Refer to the audio output specifications for the receiver being tested.
On the Test Set using the knob and data entry keys:
15 Decrease Amplitude until the SINAD meter reads 12 dB.
Sensitivity (12dB SINAD) is displayed as Amplitude as shown.
• Record the level (in uv) for use in step 17.
❒ If desired, use the meter averaging function for the SINAD indicator.
a Select dB on the SINAD meter.
b Press the AVG key.
❒ If desired, select the number of readings to average.
• Enter the number of readings to average.
Higher number of readings averaged will require longer to
reach the final indication.
❒ If desired, verify that the Receiver is tuned to a specific frequency (Re-
ceiver Center Frequency)
• Slowly increase or decrease RF Gen Freq (in 100 Hz steps) until
SINAD meter reads maximum.
Receiver Center Frequency is displayed as RF Gen Freq as shown
above.
16 If changed because of the previous steps, reset RF Gen Freq to receiver op-
erating frequency.
17 Set Amplitude to a level 6 dB higher (more positive) than the level record-
ed in step 5.
18 Increase AFGen1 To Deviation until SINAD meter reads 12 dB.
To Screen
RX TEST
AC Level
Filter 1
50Hz HPF
Filter 2
15kHz HPF
Atten Hold
On/Off
Ext Load R
8.00
Ω
RF GEN
RF ANL
AF ANL
SCOPE
SPEC ANL
ENCODER
DECODER
RADIO INT
More
W
uv
0.4527
SINAD
RF Gen Freq
146.519000
MHz
Amplitude
-119.4
dbm
Output Port
RF Out/Dupl
AFGen1 Freq
1.0000
kHz
AFGen1 To
3.00
kHz
FM
AFGen2 Freq
1.0000
kHz
AFGen2 To
Off
FM
0 14.00
Avg
24
SINAD
Center
Frequency
Sensitivity