Fm Critical And Maximum Squelch Sensitivity Measurement - HP 8920A Application Handbook

FM Receivers

FM Critical and Maximum Squelch Sensitivity Measurement

Description
This procedure is used to measure an FM 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 FM
reference is EIA/TIA-204-D.
RX TEST
RF IN/OUT DUPLEX OUT
POWER
OFF ON
MAX POWER 6 0 W
!
CONTINUOUS
50Ω COXIAL
CABLE
94
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
3 Knob
SCREEN CONTROL
MSSG HELP CONFIG
RX TX DUPLEX
USER DATA FUNCTIONS
k1' REF SET METER
INCR INCR
k1
: 10 SET
k2' LO LIMIT
k2
k3'
CURSOR CONTROL
k3
ASSIGN
k4
RELEASE
PUSH TO SELECT
k5
SHIFT CANCEL
MIC/ACC VOLUME
ANT IN
! MAX POWER 200 mW
ANTENNA (RF INPUT)
Data Entry 2
Keys
INSTRUMENT STATE
HOLD PRINT ADRS SAVE
MEAS
PREV TESTS LOCAL RECALL PRESET
RESET
DATA
AVG
INCR X10
7 8 9
ENTER
HI LIMIT
dB
GHz
4 5 6
dBm
%
MHz
1 2 3
V
s
+ _ kHz
0
mV
Ω
YES NO ms
ppm % Hz
ON/OFF
µV
W dBµV
MEM ORY
CARD
SQUELCH AUDIO OUT AUDIO IN
HI LO
MAX M AX
! !
12 v Pk 4 2 v Pk
1
RECEIVER UNDER TEST