3-84
OPERATION
integrated MPX power in any
arbitrary 60-second time period
cannot exceed the av-
erage power of the sinewave that produced
±
19 kHz carrier deviation. In other
words,
whenever you start measuring
, you must not exceed the total integrated
power limit over the following 60 seconds.
This makes it impractical to "bank" power over the full 60-second window. For ex-
ample, at first glance one might think that a classical music station could exploit a
period of quiet music to allow a crescendo to get louder than it would using the
8600's relatively fast integration time. However, what happens if someone starts an
arbitrary 60-second measurement period not at the beginning of the quiet passage
but at the beginning of the crescendo?
Because an automatic MPX power controller does not know what is coming after
the crescendo, it must reduce the level of the crescendo so that it complies with the
MPX requirement over an integration time that is shorter than 60 seconds. Other-
wise, it might have to dramatically reduce the level of following (as yet unknown)
program material in order to ensure that the MPX power limit is not exceeded over
the 60-second measurement period in question. This kind of gain pumping would be
far worse than the pumping produced by using a relatively short integration time.
Setup: Test
Parameter Labels
Units
Default
Range (CCW to CW)
Step
Mode
—
Operate
Operate, Bypass, Tone
—
Bypass Gain
dB
0.0
−
18 … +25
1
Tone Frequency
Hz
400
16, 20, 25, 31.5, 40, 50,
63, 80, 100, 125, 160,
200, 250, 315, 400, 500,
630, 800, 1000, 1250, 1600,
2000, 2500, 3150, 4000, 5000,
6300, 8000, 9500, 10000, 12500,
13586.76, 15000
LOG
Tone Mod. Level
%
91
0 … 100
1
Tone Mod. Type
—
L+R
L+R, L
−
R, LEFT; RIGHT
—
Pilot
—
ON
ON, OFF
—
Table 3-14: Test Modes
Test Modes
The Test Modes screen allows you to switch between
O
PERATE
,
B
YPASS
, and
T
ONE
.
When you switch to
B
YPASS
or
T
ONE
, the preset you have on air is saved and will be
restored when you switch back to
O
PERATE
.
The
M
ODULATION
M
ODE
setting in the
I
NPUT
/O
UTPUT
>
C
OMPOSITE
screen de-
termines the stereo/mono mode. The choices are
S
TEREO
,
M
ONO
-L,
M
ONO
-
R,
M
ONO
-S
UM
,
AND
SSB
.
shows the facilities available, which should be self-
explanatory.
Содержание OPTIMOD-FM 8600
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