HP 8920A - Page 98

FM Receivers
96
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.
• Record this level.
14 Decrease Amplitude until the Receiver’s squelch just closes.
• Record this level.
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.
• Record this level.
18 Record the maximum squelch sensitivity is displayed as Amplitude as
shown.
19 Decrease Amplitude until the Receiver’s squelch just closes.
• Record this level.
Calculate the reading:
20 Maximum Squelch Hysteresis is the difference between the two readings.
Squelch
Sensitivity
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
dB
dB
-20.34
SINAD
RF Gen Freq
145.280000
MHz
Amplitude
0.0890
uV
Output Port
RF Out/Dupl
AFGen1 Freq
1.0000
kHz
AFGen2 Freq
1.0000
kHz
AFGen2 To
Off
FM
02.23
Avg
24
Ref
AFGen1 To
3.00
kHz
FM
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