HP 8920A Application Handbook page 150

AM Receivers
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.
•
Squelch
Sensitivity
16. Decrease Amplitude until the Receiver's squelch just closes.
•
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.
•
20. Record the maximum squelch sensitivity is displayed as Amplitude as
shown.
21. Decrease Amplitude until the Receiver's squelch just closes.
•
Calculate the reading:
22. Maximum Squelch Hysteresis is the difference between the two readings.
148
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SINAD
0 20.44
RF Gen Freq AFGen1 Freq
28.310000
MHz
AFGen1 To
Amplitude
AM
1.58
uV
Atten Hold
On/Off
Output Port
RF Out/Dupl
Record this level.
Record this level.
Record this level.
RX TEST
AC Level
dB
V
0.7878
24
To Screen
AFGen2 Freq
Filter 1
1.0000 1.0000 RF GEN
50Hz HPF
kHz kHz
RF ANL
AFGen2 To AF ANL
Filter 2
SCOPE
FM 15kHz HPF
30.0
Off
SPEC ANL
%
ENCODER
DECODER
Ext Load R
RADIO INT
8.00
Ω
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