OPTIMOD-FM INSTALLATION
2-37
B) Choose the function of the Composite 2 Output.
This output can provide a second composite signal with independently ad-
justable level. This usually drives a back-up FM exciter. The second output
can also be set to provide a 19 kHz
Pilot Reference output for RDS/RBDS
generators. If required, set the
Output 2 to Pilot Ref.
C)
Adjust the composite level to produce 100% modulation of the FM carrier on
modulation peaks. Alternately, you can use tone.
If you are using subcarriers, this screen allows you to specify the amount by
which the 8400 automatically reduces main and stereo subchannel modulation
to accommodate the subcarrier within the modulation limits specified by the
governing authority.
See step 9-(C) on page 2-27 for a more detailed discussion.
D)
Ordinarily, you will set the Pilot to On and the Pilot Level to 9% modulation.
If you have to reduce the setting of the Composite Level control to accom-
modate overshoots in the transmission path following the 8400 (including
the transmitter), you may have to increase the setting of the
Pilot Level so
that the pilot is still at 9% modulation.
9. Set up a low-delay headphone monitoring system (optional).
If you do not need the 8400’s analog output to drive a transmitter, you can
configure it to receive the output of a special version of the multiband com-
pressor (without look-ahead). This signal is suited for driving headphones. The
input/output delay is approximately 5-10 milliseconds (depending on the set-
ting of
AGC Crossover Type). Even though normal 8400 presets have a delay
of about 20 ms, which most DJs, announcers, and presenters can learn to use
without discomfort (although they may need some time to become accustomed
to it), the low-delay output will cause less bone-conduction comb filtering.
However, in most cases, the low-delay output will not be necessary to ensure
adequate talent comfort.
The normal delay is 20 ms except for “LL” (“low latency”) presets, which
have 15 ms delay.
To configure the Analog Output for Low-Delay Monitoring:
A) Choose Input/Output from the main menu.
B) Navigate to the Output screen (Input/Output 2).
C) Choose Out Feeds: Monitor.
D) Set the analog output pre-emphasis control to Flat.
CAUTION: The low-delay output has no peak limiting and is therefore not
suited for driving a transmitter. If you use the low delay output, you must drive
your transmitter with the AES/EBU digital output or with the composite out-
put.
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