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FM Receivers
94
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.
DUPLEXTXRX PREV TESTS
CONFIGHELPMSSG HOLD PRINT
SCREEN CONTROL
LOCAL
ADRS
RECALL
SAVE
MEAS
RESET
PRESET
INSTRUMENT STATE
DATA FUNCTIONS
IN CR
: 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
MEM ORY
CAR D
AUDIO IN
LOHI
!
MAX
42 v P k
!
MAX
12 v Pk
AUDIO OUTSQUELCHVOLUMEMIC/ACC
MAX PO WER 200 m W
!
ANT IN
DUPLEX OUTRF IN/OUT
!
MAX POWER 60 W
CONTINUOUS
POWE R
OFF O N
1
2
Data Entry
RX TEST
50Ω COXIAL
CABLE
RECEIVER UNDER TEST
ANTENNA (RF INPUT)
3 Knob
Keys