HP 8920A Application Handbook page 98

FM Receivers
On the Test Set using the knob and data entry keys:
13 Slowly increase the Amplitude until squelch just remains open.
Critical Squelch is displayed as Amplitude as shown.
•
Squelch
Sensitivity
14 Decrease Amplitude until the Receiver's squelch just closes.
•
Calculate the measurement:
15 Critical Squelch Hysteresis is the difference between the two readings.
On the Radio set the Receiver's Controls as follows:
16 Set the Receiver's squelch control to maximum.
On the Test Set using the knob and data entry keys:
17 Increase Amplitude until the Receiver's squelch just opens.
•
18 Record the maximum squelch sensitivity is displayed as Amplitude as
shown.
19 Decrease Amplitude until the Receiver's squelch just closes.
•
Calculate the reading:
20 Maximum Squelch Hysteresis is the difference between the two readings.
96
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Record this level.
SINAD
0 2.23
Avg
RF Gen Freq AFGen1 Freq
145.280000
MHz
AFGen1 To
Amplitude
FM
0.0890
uV
Atten Hold
On/Off
Output Port
RF Out/Dupl
Record this level.
Record this level.
Record this level.
RX TEST
AC Level
dB
dB
-20.34
24
Ref
To Screen
AFGen2 Freq Filter 1
1.0000 1.0000 RF GEN
50Hz HPF
kHz kHz
RF ANL
AF ANL
AFGen2 To Filter 2
SCOPE
FM 15kHz HPF
3.00
Off
SPEC ANL
kHz
ENCODER
DECODER
Ext Load R
RADIO INT
8.00
Ω
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