SSB Receivers

182

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 opene d. Maximum sque lc h is t he am ount

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.

DUPLEXTXRX PREV TESTS
CONFIGHELPMSSG HOLD PRINT
SCREEN CONTROL
LOCAL
ADRS
RECALL
SAVE
MEAS
RESET PRESET
INSTRUMENT STATE
DATA FUNCTIONS
INCR
: 10
REF SET
INCR
SET
METER
INCR X10
AVG
LO LIMIT HI LIMIT
CURSOR CONTROL
PUSH TO SELECT
CANCEL
SHIFT
k1
k1’
k2
k2’
k3
k3’
k4
ASSIGN
k5
RELEASE
USER DATA
789
456
123
0+
_
ENTER
GHz
dBm
dB
MHz
V
%
kHz
mV
s
Hz
µV
ms
%
dBµV
Ω
ppm
W
NO
ON/OFF
YES
MEMORY
CARD
AUDIO IN LOHI
!MAX
42 v Pk
!MAX
12 v Pk
AUDIO OUTSQUELCHVOLUMEMIC/ACC
MAX POWER 200 mW
!
ANT INDUPLEX OUTRF IN/OUT
!MAX POWER 60 W
CONTINUOUS
POWER
OFF ON
1
2
Data Entry
RX TEST

50Ω COXIAL

CABLE
TEST LOAD
SSB RECEIVER UNDER TEST
ANTENNA (RF INPUT)
SPEAKER

(AUDIO

INPUT)
3
+
GND
Knob Keys