HP 8920A Application Handbook page 148

AM Receivers
148
On the Test Set using the knob and data entry keys:
15. Slowly increase the Amplitude until squelch just remains open.
Critical Squelch is displayed as Amplitude as shown.
• Record this level.
Squelch
Sensitivity
16. Decrease Amplitude until the Receiver's squelch just closes.
• Record this level.
Calculate the measurement:
17. Critical Squelch Hysteresis is the difference between the two readings.
On the Radio set the Receiver's Controls as follows:
18. Set the Receiver's squelch control to maximum.
On the Test Set using the knob and data entry keys:
19. Increase Amplitude until the Receiver's squelch just opens.
• Record this level.
20. Record the maximum squelch sensitivity is displayed as Amplitude as
shown.
21. Decrease Amplitude until the Receiver's squelch just closes.
• Record this level.
Calculate the reading:
22. Maximum Squelch Hysteresis is the difference between the two readings.
RX TEST
SINAD
dB
0 20.44 24
RF Gen Freq AFGen1 Freq AFGen2 Freq
28.310000 1.0000 1.0000
MHz kHz
AFGen1 To
AFGen2 To
Amplitude
1.58 AM FM
uV 30.0
Off
%
Atten Hold
On/Off
Output Port
RF Out/Dupl
AC Level
V
0.7878
To Screen
Filter 1
RF GEN
50Hz HPF
kHz
RF ANL
AF ANL
Filter 2
SCOPE
15kHz HPF
SPEC ANL
ENCODER
DECODER
Ext Load R
RADIO INT
8.00
Ω
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