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QEI 691 Instruction Manual page 13

Fm modulation monitor/test set
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3.
and Right Signal to Noise
Depress OISPLAY
LEeT LEFT-RIGHT
pushbutton and place
METER MODI
HOLD/AUTO switches in AUTO position.
Remove
1
and right modulation
from transmitter but do not remove pilot.
Depress
METER DE
push-
Meters wi11 autorange
ve signal to noise readings.
4.
left and Right Distortion
High;
deemphasi
audio
is
available at
LEFT/RIGHT
AUDIO
jack for connection to a distortion
t
set.
The signal is
switched between left and right by the
OUTPUT SELECT
switch.
5.
Main Channel
(L=+R)
and Subchannel
(l=-R)
Modul
on
Depress
OISPLAY
MAIN-SUB pushbutton and place
METER MOD/HOLD/
AUTO
swi
in
MOD
ition.
A fully modulated
signal will read
90%
on
CHANNEL A
meter
signal will read 90% on
o
on
CHANNEL B
meter.
A
fully modul
L=-R
CHANNEL
B
meter
and 0
on CHANNEL
A
meter.
6.
talk (Main into Sub and Sub into Main)
s
DISPLAY
MAIN-SUB pushbutton and
ace
METER MOO/HOLD/
AUTO
in AUTO position.
A
ly·modulated
L=+R
or
signal will
indica
90% (-IdB) on
i
respective meter.
The other meter will
to
give the
crosstalk reading.
(Al
c
sum of
METER RANGE (-dB) and
its
as
meter -
. )
7.
Pilot
Injec
on
and
Monitor Phase
ibration
Depress
DISPLAY SELECT prLOT -
~
CAL pushbutton and
ace METER
MOD/HOLD/AUTO
swi
on.
Pilot injection is then read on
lOT
scale
PI
lamp will light at
approximately
pilot inj
Calibration ;s accompli
by
n9 PILOT0
CAL
control for a null on
CHANNEL
B meter.
Phase Calibra-
tion may be accomplished accurately while transmitter is
n9 modul
8.
38KHz Suppression
Depress DISPLAY
38KHz -
GEN
0
pushbutton and place METER
MODI
in
AUTO position.
Modulate the transmitter with a
-R
signal
5KHz and 15KHz.
CHANNEL A meter will autorange to
ve
38KHz suppression reading.
9.
Stereo Genera
e
Check monitor phase calibration according
modulation as in 3-4-8 above.
Adjust stereo
minimum indication on
CHANNEL B
meter.
This
tor
without an
110scope.
to 3.4.7.
Set monitor and
phase control for
allows
ng genera-

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