TFT 844 - Page 18

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3.5.8
3.5.9
3.5.10
d.
With
the meter
attenuation
switches,
select
an
attenuation
that
provides a usable reading
on
the
LEFT/TEST
meter.
e.
The
crosstalk
measured
is
the algebraic
sum
of
the
selected
attenuation
and
the meter
reading,
less
1
dB
to
account
for
the
90%
modulation
setting.
FM
Noise
a.
Apply
L+R
Modulating signal
of
the
transmitter
under
test
and
adjust
the
level
for
a
90%
reading
on
the
LEFT/TEST
meter.
b.
Turn
off
all
transmitter
modulation.
c.
Press
total
modulation switch.
d.
With
the
meter
attenuation
switches,
select
an
attenuation
that
provides a usable reading
on
the
LEFT/TEST
meter.
e.
The
algebraic
sum
of
the
selected
attenuation
and
the meter reading
is
the
FM
signal
to
noise
ratio.
----NOTE----
IF
A
DE-EMPHASIZED
READING
IS
REQUIRED,
THE
DE-EMPH
FUNCTION
SWITCH
MUST
BE
DEPRESSED.
Distortion
a.
Apply
a modulating signal
to
the
transmitter
channel
to
be
measured.
b. Connect a
distortion
analyzer
to
the
appropriate
rear
panel connector.
RIGHT
channel connector J4,
LEFT
channel connector
JS,
if
de-emphasis
is
desired;
or
RIGHT
channel connector J6,
LEFT
channel connector
J7,
if
de-emphasis
is
not
required.
Pilot
Frequency
a. Connect frequency counter
to
the
"FREQ.
COUNTER"
jack
on
the
monitor
front
panel.
b. Place the frequency
selector
switch
to
the
19.0
KHz
position
.
The
transmitted
pilot
frequency
is
counted
directly
on
the counter.
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