RECEIVER SENSITIVITY TEST
12 DB
SINAD
AUDIO DISTORTION
Use
the
R-2001D
signal
generator
and
SINAD
meter
to
measure a receiver's
performance
by the following procedure:
1. As shown in figure 4-1,
connect
the
Analyzer's
RF
In/Out
to
the
antenna
connector
of
the
receiver
under
test.
Con-
nect the Analyzer's
Vert/Sinad/Dist
to
the receiver's
audio
output.
Disable all
PL's
and
open
the
Squelch.
2. Set
DISPLAY
to
Gen/Mon
Mtr
mode. Select a
FUNCTION
and
set the
FUNCTION
switch to Generate.
3. Select
the
RF
carrier frequency from
an
RF
Memory
table channel
number
or
enter directly from the keypad.
4.
Adjust
1KHz Level
control
for
60070
of
rated
deviation as indicated
on
the
CRT.
To
prevent spurious noise
modula-
tion, set
MODULATION
switch to
Off
and
Ext Level control
to
Off.
a. With a
lOOOuV
RF
input
level,
adjust
the volume
control
to
rated audio power
output.
EIA
RS-204-C specifies
that
the receiver be set to
produce
rated
audio
power before measuring 12dB
SINAD.
b. Read %
distortion
directly
from
the
DlST
/SINAD
scale.
5. Set
RF
Step
attenuator
to
-llOdB
and
the variable
control
to mid-range.
The
display's
RF
LEVEL
should
indicate
about
2uV.
Adjust
the
attenuator
(lOdB steps)
and
the variable
RF
control
until a 12dB
SINAD
reading
appears
on
the
display.
6.
From
the
RF
LEVEL
on
the display, read the receiver's 12dB
SINAD
sensitivity in uV
and
dBM.
4-3
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