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2.
Mono Distortion
Approximately 6V
@
100%
@
400Hz is available for connection to
a
high Z
distortion
me~gr
at the
DE EMP AUDIO
jack.
This output is
deemphasized 75usec and ;s
fil
to remove 19KHz.
3.
FM Signal to Noise / AM Signal to Noise
Remove modulation from the transmitter.
Depress FM
SIN - AM
SIN
OISPLAY
SELECT
pushbutton.
Place CHANNEL A and CHANNEL
B
METER
MOD/HOLDI
AUTO switches in AUTO.
FM
Signal to Noise will
displayed on CHANNEL A
meter and
AM
Signal to Noise will be displayed on CHANNEL B meter.
The
reading will be the aigebraic sum of the METER RANGE (-dB) readout and
the associated meter.
Note that FM SIN is automatically measured with
deemp in a 50Hz to 15KHz bandwidth.
If it is desired to check
for FM noise below 50Hz, e.g. blower vibration, depress DISPLAY SELECT
MAIN-SUB
and
read CHANNEL
A
while holding CHANNEL A METER
EMP -
FLAT
pushbutton depressed. Any difference in the noise readings indicates
noise with a frequency component below 50Hz.
AM
SIN
is automatically
measured with 75usec deemp and is accurate as long as the RF LEVEL HI
led is out and RF LEVEL OK led is lit.
The residual noise
be ob-
served with a scope connected to SCOPE jack.
The OUTPUT
switch'
is then used to route either Channel A or Channel B to the scope.
3-4
STEREO MEASUREMENTS
1.
Left and Right Channel Modulation
Depress DISPLAY
ECT LEFT
GHT pushbutton and place METER MOD/
HOLD/AUTO
switches in MOD posi'tion.
CHANNEL A meter will indicate
left channel modul
ion and CHANNEL B meter will indicate right channel
modulation with FCC spec; ed semi
balli
cs.
A fully modulated left or right stereo signal will indicate 90%.
rf
pi'
is removed, both meters will indicate the same as the
TOTAL
MODULATION
meter.
If MOD/HOLD/AUTO switches are placed in HOLD position, the ballistics change
to semi-VU and the RANGE (-dB) readouts will illuminate.
If the METER DE EMP
pushbutton is then depressed, the meter will give an approximate indication
of the loudness
ived at the output of a receiver.
2.
Separation
Depress DISPLAY
FT-RIGHT pushbutton and place METER
MOD/HOLD/
AUTO switches in AUTO position.
Apply a fully modulated left or right signal
to the transmitter.
The fully modulated channel should read 90% (-ldS).
The
unmodulated channel will autorange to
ve the separation reading.
(Algebraic
sum of the METER RANGE (-dB) and its associated meter -ldB.)
NOTE:
Be sure
of monitor
0
calibration before attempting separation measurements.
See 3.4.7.
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