Orban OPTIMOD 6300 Operating Manual page 38

1-14
INTRODUCTION
The 6300's AGC uses the same dual-band, window-gated, matrix technol-
ogy as the AGCs in Orban's 2300, 5300, 8300, 8382, 8400, 8500, 9300, and
9400 Optimods. It can therefore accurately substitute for the AGCs in
these devices and can help maintain an all-digital signal path throughout
the facility. Because the 6300's AGC is more advanced than the AGCs in
Orban's 2200, 8200, and 9200 Optimods, the 6300 can upgrade the per-
formance of these older products when substituted for their AGCs.
Moreover, because the 6300 supports presets that be recalled by remote
control, it can be automatically synchronized to the presets active at a
transmitter-side Optimod when presets are dayparted.
The 6300's multiband processing is based on the technology used in Op-
timod-FM 8500's digital radio processing path and will sound similar. To
help you match the sound of an 8400 or 8500, the 6300 provides presets
with the same names as those in Optimod-8400 and 8500. If you are us-
ing a factory preset at a transmitter-side 8400 or 8500, you can recall a
preset with the same name in the 6300 to ensure that the sound stays the
same as it would if you were using an 8400 or 8500 with its internal AGC.
To achieve this match, you must adjust the transmitter-side Optimod's
input reference level so that the Optimod performs the correct amount
of multiband gain reduction (i.e., the same amount of GR that it would
have performed if its internal AGC were active). This match will occur
automatically if you use the 6300's tone generator to emit a 400 Hz tone
and then use the tone to calibrate the transmitter-side Optimod. Step (E)
on page 2-22 of this manual describes this procedure for a 6300 at the
transmitter; the procedures for the 2300, 5300, 8300, 8382, 8400, 8500,
9300, and 9400 Optimods are virtually identical and are described in their
manuals.

Digital output #2 emits a peak-limited, multiband-processed signal to drive a
netcast encoder (like Orban's Opticodec-PC) or a digital radio transmitter.

The analog output emits a low-delay multiband-processed signal with no peak
limiting to drive talent headphones at the studio.
The total input-to-output delay through this path is approximately 5 ms.
While you could also use one of the digital outputs to emit this signal,
this would add about 1 ms of delay because of the additional delay of
the external D/A converter required before the headphone amplifier.
The peak limiters can be switched to operate either "flat" or on a 50s or 75s pre-
emphasis curve to protect a pre-emphasized path like a typical analog microwave
STL.
When operated in pre-emphasized mode, the peak limiters should only
be used for light protection limiting with a low duty cycle. Otherwise,
you may hear pumping on material with a lot of high frequency energy
like sibilance.
Because the look-ahead peak limiting technology used in the 6300 per-
forms optimally with "flat" transmission channels (like almost all digital
channels), the 6300 cannot provide loudness processing for pre-
emphasized radio channels. Use one of Orban's Optimod-FM processors
for this application. For analog television with FM aural carrier(s), use
Optimod-TV 8382.
ORBAN MODEL 6300