Orban OPTIMOD-FM 8700, Руководство по эксплуатации

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OPTIMOD-FM DIGITAL INSTALLATION
2-41
specifically requires this phase relationship. 180 D
EG
and 270 D
EG
take into ac-
count installations where there is a polarity reversal in the RDS generator.
21. End Analog and Digital I/O setup.
If you are using an external AGC and you temporarily set the E
XTERNAL
AGC to
N
O
in step 1 on page 2-27, set the
E
XTERNAL
AGC
to
Y
ES
.
When you are finished adjusting input/output parameters, press the
Escape
but-
ton to return to the Meters screen.
22. Select a processing preset.
This step selects the processing to complement the program format of your sta-
tion.
After this step, you can always select a different processing preset, program the
8700i to automatically change presets on a time/date schedule, modify presets to
customize your sound, and store these presets as User Presets.
A) Navigate to the Presets screen.
a) Press the control knob to display the pop-up Menu.
b) Turn the knob to highlight
P
RESETS
and press the knob.
B) Using the
Locate
joystick up/down control or turning the control knob, high-
light a preset corresponding to your format. Press
Enter
to put the highlighted
preset on the air.
For a discussion of the presets, see Factory Programming Presets starting
on page 3-22. Preset names are just suggestions . Feel free to audition dif-
ferent presets and to choose the one whose sound you prefer. This preset
may have a very different name than the name of your format. This is
OK.
You can easily modify a preset with the 8700i’s one-knob
L
ESS
-M
ORE
fea-
ture. Navigate to the Basic Modify screen. (There may be a short delay
while the 8700i computes Less-More values.) If you do not see the
L
ESS
-
M
ORE
screen immediately, press and hold the Locate joystick to the right
or left until you find the screen. Turning L
ESS
-M
ORE
up will produce more
loudness but also more processing artifacts like distortion and unpleasant
density. Turning
L
ESS
-M
ORE
down will make the sound cleaner, more
open, and easier to listen to, but will also make it quieter.
C) If you are using the digital radio processor’s BS.1770 Safety Limiter (step 10 on
page 2-32) you must set your chosen processing preset’s
HD F
INAL
L
IMITER
D
RIVE
to create the appropriate amount of gain reduction in the BS.1770 Safety Lim-
iter. Then save the result as a User Preset. We recommend allowing the
BS.1770 Safety Limiter to produce no more than 3 dB of gain reduction.
BS.1770-3 is an imperfect metric. It has been established by listening tests
that BS.1770-3 can over-indicate loudness by 3 dB or more when the pro-
gram material has an unusually low peak-to-RMS ratio because of pro-
duction techniques, dynamic compression, etc. Whenever the BS.1770
meter would otherwise read above 0 LU, the BS.1770 Safety Limiter pro-
duces gain reduction that is the inverse of the BS.1770 meter’s reading.
Hence, the Safety Limiter can cause such material to be unnaturally quiet