Fm Ctcss Sensitivity And Bandwidth Measurement - HP 8920A Application Handbook

FM CTCSS Sensitivity and Bandwidth Measurement

POWER
OFF ON
!
50Ω COXIAL
CABLE
ANTENNA (RF INPUT)
Description
This procedure is used to measure an FM Receiver's Continuous Tone Coded
Squelch System (CTCSS) sensitivity and bandwidth. For sensitivity, the
minimum signal input at the Receiver's antenna (modulated with tone) that
opens the squelch is measured and displayed. Squelch hysteresis is also
measured and calculated. Tone frequency is then increased and decreased until
the squelch boundaries are determined and the Bandwidth is calculated.
Reference is ANSI/EIA RS-220A.
RX TEST
RF IN/OUT DUPLEX OUT ANT IN
M AX POWER 60 W
!
M AX POWER 200 mW
CONTINUOUS
1
RECEIVER UNDER TEST
3 Knob Data Entry
Keys
SCREEN CONTROL
M SSG HELP CONFIG HOLD PRINT ADRS
RX TX DUPLEX PREV TESTS LOCAL
USER DATA FUNCTIONS
k1' REF SET METER AVG
INCR INCR INCR X10
7
k1
: 10 SET
k2' LO LIMIT HI LIMIT
k2
4
k3'
CURSOR CONTROL
k3
1
ASSIGN
k4
RELEASE
0
PUSH TO SELECT
k5
YES
ON/OFF
SHIFT CANCEL
MIC/ACC VOLUME SQUELCH AUDIO OUT
!
12 v Pk
TEST LOAD
FM Receivers
2
INSTRUMENT STATE
SAVE
MEAS
RECALL PRESET
RESET
DATA
8 9
ENTER
dB
GHz
5 6
dBm
%
MHz
2 3
V
s
+ _ kHz
mV
Ω
NO ms
ppm % Hz
µV
W dBµV
M EMORY
CARD
AUDIO IN
HI LO
M AX MAX
!
42 v Pk
SPEAKER
(AUDIO
+
INPUT)
GND
97