TFT 844 - Page 17

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3.5.5.2
3.5.6
3.5.7
Stereo
Channel
Separation (Right
Channel
Modulated)
a.
Press the R function switch.
b. Press the
100%/0
dB
meter attenuation switch.
c.
Apply
a modulating signal
between
50
Hz
and
15
KHz
to
the
right
channel of the
transmitter
under
test
and
adjust
its
level
to
indicate
90%
on
the
LEFT/TEST
meter.
d. Press the L function switch.
e.
With
the
meter attenuation switches,
select
an
attenuation
that
provides a usable reading
on
the
LEFT/TEST
meter.
f.
The
channel separation
is
the algebraic
sum
of
the
meter reading
and
the
attenuation
inserted,
less
1
dB
to
account for the
90%
right-channel modulation
level.
Main
Channel
to
Subchannel Crosstalk
a. Press the
L+R
function switch
and
the
100%/0
dB
meter attenuation switch.
b.
Apply
an
L+R
modulating signal
to
the
transmitter
under
test
and
adjust
the
level
for
a
90%
reading
on
the
LEFT/TEST
meter.
c. Press
the
L-R
function switch.
d.
With
the meter attenuation switches,
select
an
attenuation
that
provides a usable reading
on
the
LEFT/TEST
meter.
e.
The
crosstalk
measure
is
the algebraic
sum
of
the
selected
attenuation
and
the meter
reading,
less
1
dB
to
account for the
90%
modulation
setting.
Subchannel to
Main
Channel
Crosstalk
a. Press the
L-R
function switch
and
the
100%/0
dB
meter attenuation switch.
b.
Apply
an
L-R
modulating signal to the
transmitter
under
test
and
adjust the level
for
90%
reading
on
the
LEFT/TEST
meter .
c. Press
the
L+R
function switch.
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