Orban Optimod 9100A Brochure

User Manual: Orban Optimod 9100A Brochure

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OPTIMOD-AM 9100A

D-

MONO OR STEREO
STEAM POWERED RADIO.COM
OPTIMOD-AM 91 00A

Why A New
OPTIMOD-AM:

OPTIMOD-AM?

An integrated audio processing
system for AM radio, including
compressor, program equalizer,
multiband limiter, clipper, and
transmitter equalize r

Strangely enough, because of the successful new OPTIMOD-FM Model
8100A.

Performance

Highlights
D Supplies very high average modulation (loudness), exceptional fide lity,
uncanny naturalness, and freedom
from processing artifact to yield an
FM-like sound from typical auto, portable, and table rad ios.

D Designed for universal application in
domestic or international LW, MW,
and SW services; easi ly adaptable to
relevant government standards.

D Compensates for receiver high frequency rolloff with statistically-derived, adjustable equalizer to extend
perceived bandwidth at the receiver
without introducing midrange response anomalies or receiver tuning
difficulties.
D New six-band limiter with distributed,
distortion-cancelled multiband clipper yields at least 3dB increase in RMS
modulation levels compared to old
Model 9000A.
D Consistent output level and equalization texture over a 25dB input level
range.
D Versatile and simple setup controls let
you quickly arrive at the sound you
really want.
D Improved transmitter equalizer corrects tilt and ringing in older transmitters and antenna systems for
maximum modulation .
D Outputs for two transmitters with independent output level control and
full remote control switching for TXI/
TX2 and DAY/N IGHT status: i.e., four
sets of TX EQ adjustments available,
all remote-selectable.
D Sum-and-difference stereo or mono
versions available; mono unit fully
ready for stereo processing by simply
plugging-in additional circuit cards.
D Orban-quality construction, documentation, support, and service.

STEAM POWERED RADIO.COM

Some of the innovations introduced in it
turned out to be highly applicable to AM
processing. Specifical ly, the FM unit introduced a simpler, more economical,
and more elegant means of realizing the
now-patented distortion-cancelling clipper first introduced in the old 9000A
OPTIMOD-AM. And the FM unit features a distributed crossover with
embedded clipper (now patented, too).
This concept, extended to six bands and
combined with the distortion-cancelling
filter, is the key to the higher loudness
and astonishingly improved naturalness
of the new 91 00A OPTIMOD-AM.

A Smarter
"Smart Clipper"
In the previous AM unit, the outputs of
the six bands in the six-band limiter are
combined, fed through a vo ltage-controlled amplifier, and then applied to a
distortion-cancelled clipper. A complex
circuit we call the "Smart Clipper'""
controls the gain of the YCA by estimating the amount of audible distortion
caused by the clipping process, and reducing the VCA gain until such distortion is no longer objectionable.
This,alas, is a wideband control process,
and must therefore not be over-used if its
operation is to be inaudible. In the quest
for ever-higher loudne s, many Model
9000A users have chosen to operate the
"Smart Clipper" with so much gain reduction that its operation is audible. It
therefore became clear to us, as designers, that it wou ld be far better to eliminate the need for any wideband gain
reduction between the output of the
multi band section and the fina l safety
clipper. That way, wideband modulation
effect would never occur.
This is more easily said than done. In the
previous AM unit, the "Smart Clipper"
control circuitry is absolutely necessary
to avoid either unacceptable loudness
loss or unacceptable di tortion on certain program material. The key turned
out to be multiband clipping combined
with distortion cancellation, using our
patented techniques in concert with
some new developments.

The Bottom Line:
FM-Like Performance
The exciting result of such processing is
that the combined output of the bands
can be fed to a safety clipper without
interspersing wideband gain control provided that almost 100 internal
parameters are correctly "tuned" in the design process! However, the payoff i
worth it: a dramatically open, effortless,
multiband ound with literally no audible processing on virtually any radio
likely to be in the hands of your audience. A so und which is "FM-like" not
only in terms of frequency response, but
also in terms of "punch", "depth",
"openness", and "definition". And a
sound which, on a true RMS meter, averages about 3dB higher than the previous
unit for the same peak modulation. In
hort a loud yet unbelievably natural
sound which, we think, stands the best
chance yet of winning back an audience
becoming more and more attracted to
FM.

AM Stereo
The 91 00A is available as a stereo
processor, or as a stereo-convertible mono
processor. Stereo conversion is achieved
simply by plugging in circuit cards - no
"accessory chassis" is required except
for the stereo generator.

Processing occurs in the "sum-and-difference" mode, which is most appropriate for AM stereo because the AM
modulation component represents the
sum (L + R) of the channels to assure
compatibility with mono receivers. Internal straps determine if the output is to
be in L +Rand L-R mode, or in Land R
mode, yie ldi ng complete versatility in
matching it to the stereo generator.
The standard bandwidth of the 91 00A is
limited to 12kHz by means of highly elective filters, enabling it to comply with

AND LOUDER, NATU
the occupied bandwidth requirem nls
of FCC 73.40.a.12 with arb itrary program material and processing adju lments. An optional plug-in fill r ard,
provided at extra cost, (whi h
fully interfaces with th DAY/
NIGHT remote ontrol) p rmits you to
limit the bandwidth of the L-R channel
to SkHz, contro llin g pol nlial IM distortion which can be introdu ced by highenergy high frequen y informa tion in
some of the AM sl rco systems.
This card also has qrap~ which permit
realization of vi rluc1I ly TI~OD-N~
Effective 1 July 1983
Revision 5
Order/
Model
Number

9100CV1

Suggested
List Price

Description

Cf>TU1)D:fV1
AUDIO PROCESS ING SYSJEM--tmAUPAL
Multiband compressor/limiter with safety clippers,

$4395,00

dual transmitter outputs with transmitter equalization.
Includes Manual, ACC-5 Monitor Rolloff Filter, Accessory
Port. Convertible to stereo later by addition of RET-16
below. 115/230V, 50/60Hz.

910)\/2

CfTlfW::N:1 AUDIO PROCESSl.NG_SYSJB'.l--STEf[()

As above, equipped for stereo; can be used for mono.

$5295,00

Stations operating phone lines or microwave STL's may wish to optimize S/N of the
link by use of the Orban 422A (mono) or 424A (stereo) Compressor/Limiter ahead of
the link. Use of this device is compatible with the Optimod and is discussed in
detail in the ~nual for the ·O ptimod.
ACCESSORIES (Specify host model# if ordered separately from system)
Retrofit Kits (RET-) will be installed and tested at the
factory at no charge when ordered with the host system.
RET-16

Stereo Conversion Kit. Converts 9100A/l (mono) to 9100A/2
(stereo) by installation of 3 additional cards and minor
adjustments. Includes one ACC-5 Monitor Rolloff Filter.

$995.00

RET-17

Lowpass Filter card Retrofit Kit.
(Card 1} Additional card
for use where 5kHz LP filter is required in either L+R or L-R
channel or both. Recommended for Magnavox and Motorola AM
Stereo installations. Other frequencies available on special
order. Field installation in card slot #1. Jumper change
and minor adjustment required.

$135.00

RET-24

Highpass Filter Card Retrofit Kit.
(Card lH) Additional card
required for Harris AM Stereo installations. Field installed
in card slot #1. Jumper change required.

$95.00

ACC-5

Monitor Rolloff Filter (one channel). Approximates typical
receiver rolloff in studio monitoring application from monitors
and wideband receivers. One or two are supplied with each
Optimod-AM, as appropriate.

$95.00

MAN-7

9100A Operating Manual.
Postpaid.

$17.00

(One is supplied with each Optimod-AM.)

-------------------------------------------------------------------------------------Prices are for domestic U.S. only and are subject to change without notice. Orban
Broadcast Products are sold through Authorized Dealers.
near you or for further information.

Call for names of dealers

Orban Associates Inc., 645 Bryant St., San Francisco, CA 94107
Toll Free: (800) 227-4498, In California, (415) 957-1067
905039 _ 0 0 2 -05
STEAM POWERED RADIO.COM
Telex: 17-1480 Cable: ORBANAUDIO

7/83



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