HP 8920A Application Handbook page 184

SSB Receivers
SSB Squelch Sensitivity Measurement
Description
This procedure is used to measure an SSB Receiver's critical squelch and
maximum squelch sensitivity. For critical squelch, the receiver is just
squelched with minimum modulated input at the Receiver's antenna, then the
input is increased until the squelch is opened. Maximum squelch is the amount
of modulated signal required to open the squelch when the control is set to
maximum. Minimum and maximum squelch hysteresis is also measured and
calculated. The SSB reference is IEC 489-5, paragraph 11.
RX TEST
RF IN/OUT
POWER
OFF ON
M AX POWER 60 W
!
CONTINUOUS
50Ω COXIAL
CABLE
ANTENNA (RF INPUT)
182
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3 Knob
SCREEN CONTROL
MSSG HELP CONFIG
RX TX DUPLEX
USER DATA FUNCTIONS
k1' REF SET
INCR
k1
: 10
k2'
LO LIMIT
k2
k3'
CURSOR CONTROL
k3
ASSIGN
k4
RELEASE
PUSH TO SELECT
k5
SHIFT CANCEL
MIC/ACC VOLUME
DUPLEX OUT ANT IN
!
MAX POWER 20 0 mW
TEST LOAD
1
SSB RECEIVER UNDER TEST
Data Entry
Keys
INSTRUMENT STATE
HOLD PRINT ADRS SAVE
MEAS
PREV TESTS LOCAL RECALL PRESET
RESET
DATA
M ETER AVG
INCR INCR X10
7 8 9
ENTER
SET
HI LIMIT
dB
GHz
4 5 6
dBm
%
M Hz
1 2 3
V
s
kHz
+ _
0
mV
Ω
YES NO ms
ppm % Hz
ON/OFF
µV
W dBµV
M EMORY
CARD
SQUELCH AUDIO OUT AUDIO IN
HI LO
M AX M AX
! !
1 2 v Pk 42 v Pk
SPEAKER
(AUDIO
+
INPUT)
GND
2