TFT 844 - Page 15

www.SteamPoweredRadio.Com
3.4.1
Meter
Calibration
Set
up:
1)
Meter
Cal
Button in
2)
De
Emph
Button out
3)
0db/100%
Buttonin
4)
Total
Mod
Button in
Adjust Meter
Cal
Control
for
100%
or
0db
on
the
LEFT/TEST
meter.
3.4.2
3.5
Peak
Modulation Calibration
1)
Set Meter
Cal
Push
ButtonSwitch
to
the
in
position.
2)
Set%
peak
to 100.
3)
Set
peak
duration
to
0.
4) Adjust
Peak
Cal
Control
until
11
+
11
and
11
-
11
lightsare
on
and
peaks/min is in the constant
count
mode.
5)
Set%
peak
to
101
.
6) Press the
PEAKS/MIN
RESET
Switch.
7)
If
11
-
11
and
11
+
11
lights
are
on
and
PEAKS/MIN
is
in the constant count
mode,
readjust
PEAK
CAL
until
light
go
out
and
counter stops counting.
(A
delay of 2
sec.
may
be
encountered . )
8)
Repeat
steps
2 through 7 as required.
Measurements
Set
thumbwheel
switches to desired frequency
and
set
the
11
-
11
or
11
+"
push
button in
as
required.
3.5.1
Main
Channel
Modulation
(L+R)
Press the
L+R
function switch
and
the
odb/100%
attenuation
switch.
The
LEFT/TEST
meter will
indicate
the
main
channel
modulation
directly
in percent. A
fully
modulated
right
or
left
channel only signal will
indicate
45%
on
the meter. A
fully
modulated
L=R
signal will indicate
90%
and
a
fully
modulated
L=-R
signal will
indicate
0.
3.5.2
Stereo Subchannel Modulation
Press the
L-R
function switch
and
the
odb/100%
attenuation
switch.
The
LEFT/TEST
meter
will
indicate
the
stereo
subchannel modulation
directly
in percent. A
fully
modulated
right
or
left
channel only will
indicate
45%
on
the
meter. A
fully
modulatd
L=-R
signal will
indicate
90%
and
a
fully
modulated modulation
L=R
signal
wil
1
indicate
0.
-14-