Optimod-FM 8500 HD FM Optimod Audio Processor
Featuring versatile five-band and two-band processing for analog FM transmission, the 8500 provides consistent sound, track-to-track and source-to-source. This consistency allows you to create a sonic signature for your station with the assurance that your signature will stay locked in, uniquely branding your sound.
The 8500 provides stereo enhancement, equalization, AGC, multiband compression, low-IM peak limiting, stereo encoding, and composite limiting-everything that even the most competitive major market station needs to stand out on the dial.
More than 20 excellent sounding, format-specific factory presets get you started. Although the factory presets are fully competent “out of the box,” you can customize them with easy one-knob LESS-MORE control or with more than 60 advanced controls, whose versatility will satisfy even the most finicky on-air sound designer.
If you choose to use the 8500's superb DSP-based stereo encoder and composite limiter, be assured that they deliver an FM analog signal that is always immaculately clean and perfectly peak limited, with full spectral protection of subcarriers and RDS/RBDS regardless of the amount of composite limiting.
For HD Radio broadcasters who prefer using a separate processor for the HD channel, the 8500FM's built-in delay (up to 16 seconds) in the analog processing path vastly improves installation versatility in HD Radio facilities, freeing you from the need to use the delay line built into the HD Radio exciter. This allows you to use the 8500FM's built-in stereo encoder and composite limiter to drive the analog FM transmitter, ensuring no-compromise analog-channel loudness.
Ethernet connectivity is standard, as is an easy to use PC remote control application that can control many 8500s on a TCP/IP network. In addition, RS232 serial control and programmable contact-closure (GPI) control give you total freedom to interface the 8500 with your facility's remote control infrastructure, whatever it might be.
An intuitive user interface round out the package. Features include an easy-to-use joystick, knob, and button navigation system and a bright, active-matrix color LCD that makes it easier to program the 8500 from its front panel. The panel's eye-catching metallic blue styling makes the processor look as great in your rack as it sounds on the air.
There are two versions of Optimod-FM 8500. Model 8500HD is the full HD radio version and the analog FM-only version is 8500FM. Both models can be upgraded to Optimod-FM 8600 functionality.
New Version 3.0.1:
. Supports 8500V2 hardware, which is now shipping. The DSP board of pre-V2 8500s contains 12 Freescale (formerly Motorola) DSP56367 24-bit fixed-point DSP chips that execute DSP software code to implement digital signal processing algorithms. With V2 hardware, the DSP board contains nine Freescale 250 MHz DSPB56724 dual-core 24-bit fixed-point DSP chips. This is the same as the DSP board used in Optimod-FM 8600 and allows 8500V2 units to be upgraded to 8600 functionality (via a purchased upgrade kit) without replacing their DSP boards. Pre-V2 8500s can also be upgraded to 8600 functionality, but with these units, it is necessary to replace the DSP board.
The upgrade kits can be installed in the field. Orban offers three versions of the upgrade kit at prices that are commensurate with the features that a given kit adds. These three versions upgrade 8500FM to 8600FM, 8500FM to 8600HD, or 8500HD to 8600HD. A given kit is compatible with all versions of 8500 hardware and includes a V2 DSP board. If your 8500 has a V2 board already installed, upgrading is more convenient (there is no need to remove the 8500 from the rack) and you may retain the DSP board in the upgrade kit as a spare.
. Diversity Delay Considerations: Unlike some older pre-V2 8500s, all V2 hardware offers up to 16 seconds of diversity delay. If you have an 8500 that requires an 8-second to 16-second upgrade, it is wise to consider spending the extra money to upgrade to full 8600 functionality at the same time.
. A new SPEECH DETECT control allows the 8500 to be forced into Music or Speech modes, overriding the automatic Speech/Music detector. This control is contained in the processing preset. Creating pairs of “Music” and “Speech” user presets gives you the ability to switch between Music or Speech modes by recalling one of the pair via the 8500's API, GPI, clock-based automation, PC Remote, or the 8500's front panel.
. The stereo/mono status of the digital radio processing chain can now be independent of the status of the analog processing chain and stereo encoder. It is useful when a station is transmitting its FM analog signal in mono (to minimize noise in receivers), yet wishes to transmit its program material in stereo on the HD1 channel (because doing so creates no noise penalty).
. The audible action of the Multiplex Power Controller is now more subtle because it has been moved after the Optimod's left and right peak limiters. Previously, the controller was located between output of the Optimod's multiband compressor and the input of the Optimod's peak limiters.
It is impossible to characterize the listening quality of even the simplest limiter or compressor based on specifications because such specifications cannot adequately describe the crucial dynamic processes that occur under program conditions. Therefore, the only way to evaluate the sound of an audio processor meaningfully is by subjective listening tests.
Certain specifications are presented here to assure the engineer that they are reasonable, to help plan the installation, and make certain comparisons with other processing equipment.
Specifications apply for measurements from analog left/right input to stereo composite output and to FM analog left/right output.
Frequency Response: (Bypass Mode; Analog Processing Chain)
Follows standard 50 µs or 75 µs pre-emphasis curve ±0.10 dB, 2.0 Hz - 15 kHz. Analog left/right output and Digital output can be user configured for flat or pre-emphasized output.
Noise: Output noise floor will depend upon how much gain the processor is set for (Limit Drive, AGC Drive, Two-Band Drive, and/or Multi-Band Drive), gating level, equalization, noise reduction, etc. It is primarily governed by the dynamic range of the A/D converter, which has a specified overload-to-noise ratio of 110 dB. The dynamic range of the digital signal processing is 144 dB.
Total System Distortion: (de-emphasized, 100% modulation) < 0.01% THD, 20 Hz - 1 kHz, rising to <0.05% at 15 kHz. <0.02% SMPTE IM Distortion.
Total System Separation: > 55 dB, 20 Hz - 15 kHz; 60 dB typical.
Polarity: (Two-Band and Bypass Modes) Absolute polarity maintained. Positive-going signal on input will result in positive-going signal on output.
Defeatable Analog FM Processing Delay: 16.2 seconds (maximum), adjustable in one-sample increments at 64 kHz sample rate to allow the delays of the analog and digital paths in the HD Radio system to be matched at the receiver output.
Minimum Processing Delay: Processing structure dependent. Typically 17 ms for normal latency 5-band, 13 ms for low-latency 5-band, 3 ms for ultra-low-latency 5-band, and 17 or 22 ms for 2-band, depending on crossover structure chosen.
Analog Audio Input
Impedance: > 10 k? load impedance, electronically balanced. (No jumper selection available for 600 ?. Through-hole pads are available on I/O module for user-installed 600 ? termination.)
Connectors: Two XLR-type, female, EMI-suppressed. Pin 1 chassis ground, Pins 2 (+) and 3 electronically balanced, floating and symmetrical.
Nominal Input Level: Software adjustable from -4.0 to +13.0 dBu (VU).
Maximum Input Level: +27 dBu.
A/D Conversion: 24 bit 128x oversampled delta sigma converter with linear-phase anti-aliasing filter.
Filtering: RFI filtered, with high-pass filter at 0.15 Hz.
Analog Audio Output
Configuration: Stereo. The analog output can emit the analog FM processed signal, the digital radio processed signal, or the low-delay monitor signal. The FM processed signal can be flat or pre-emphasized (at 50 µs or 75 µs), software-selectable.
Source Impedance: 50 ?, electronically balanced and floating.
Load Impedance: 600 ? or greater, balanced or unbalanced. Termination not required or recommended.
Output Level: (100% peak modulation)
Adjustable from -6 dBu to +24 dBu peak, into 600 ? or greater load, software-adjustable.
Signal-to-Noise:= 90 dB unweighted (Bypass mode, de-emphasized, 20 Hz - 15 kHz bandwidth, referenced to 100% modulation).
Distortion:= 0.01% THD (Bypass mode, de-emphasized) 20 Hz - 15 kHz bandwidth.
Connectors: Two XLR-type, male, EMI-suppressed. Pin 1 chassis ground, Pins 2 (+) and 3 electronically balanced, floating and symmetrical.
D/A Conversion: 24 bit 128x oversampled.
Filtering: RFI filtered.
Digital Audio Input
Configuration: Stereo per AES3 standard, 24 bit resolution, software selection of stereo, mono from left, mono from right or mono from sum.
Sampling Rate: 32 kHz, 44.1 kHz, 48 kHz, 88.1 kHz and 96 kHz automatically selected.
Connector: XLR-type, female, EMI-suppressed. Pin 1 chassis ground, pins 2 and 3 transformer balanced and floating, 110 ? impedance.
Input Reference Level: Variable within the range of -30 dBFS to -10 dBFS.
J.17 De-emphasis: Software-selectable.
Filtering: RFI filtered.
Digital Audio Output
Configuration: Two outputs, each stereo per the AES3 standard. The outputs can be independently set to emit the analog FM processed signal (with or without diversity delay), the digital radio processed signal, or the low-delay monitor signal. The FM processed signal can be configured in software as flat or pre-emphasized to the chosen processing pre-emphasis (50 µs or 75 µs). The digital radio processing chain receives the output of the multiband limiter and processes it through a look-ahead peak limiter that operates in parallel with the main FM peak limiting system. The DR and FM signals are always simultaneously available. Each output can apply J.17 pre-emphasis if desired.
Sample Rate: Internal free running at 32 kHz, 44.1 kHz, 48 kHz, 88.1 kHz or 96 kHz, selected in software. Can also be synced to the AES3 SYNC input or the AES3 digital input at 32 kHz, 44.1 kHz, 48 kHz, 88.1 kHz and 96 kHz, as configured in software.
Word Length: Software selected for 24, 20, 18, 16 or 14-bit resolution. First-order highpass noise-shaped dither can be optionally added; dither level automatically adjusted appropriately for the word length.
Connector: XLR-type, male, EMI-suppressed. Pin 1 chassis ground, pins 2 and 3 transformer balanced and floating, 110 ? impedance.
Output Level: (100% peak modulation)
-20.0 to 0.0 dBFS, software controlled.
Frequency Response through Digital Radio Processing Chain: For output sample rates of 44.1 kHz and above, the frequency response from input to DR-configured output is ±0.10 dB, 2.0 Hz - 20 kHz; flat or with J.17 pre-emphasis applied. The user may specify low-pass filtering to constrain the bandwidth to 15, 16, 17, 18, or 19 kHz.
Relative Time Delay between FM & Digital Radio Outputs: Output of analog-FM processing chain can be delayed up to 16.2 seconds (adjustable in 15.6 microsecond increments) with respect to digital radio processing chain. Once set, relative delay between the FM and DR processing chains is constant, regardless of preset in use. The delay can be independently applied to any output emitting the FM-processed signal.
Filtering: RFI filtered.
Digital Sync Input
Configuration: Used for synchronization of either or both AES3 signals to an external reference provided at this input.
Sampling Rate: 32 kHz, 44.1 kHz, 48 kHz, 88.1 kHz and 96 kHz, automatically selected.
Connector: XLR-type, female, EMI-suppressed. Pin 1 chassis ground, Pins 2 and 3 transformer balanced and floating, 110 ? impedance.
Filtering: RFI filtered.
Composite Baseband Output
Configuration: Two outputs, each with an independent software-controlled output level control, output amplifier and connector.
Source Impedance: 0 ? voltage source or 75 ?, jumper-selectable. Single-ended, floating over chassis ground.
Load Impedance: 37 ? or greater. Termination not required or recommended.
Maximum Output Level: +12.0 dBu (8.72 Vp-p).
Minimum Output Level: -12 dBu (0.55 Vp-p) for 0.5 dB adjustment resolution.
Pilot Level: Adjustable from 6.0% to 12.0%, software controlled.
Pilot Stability: 19 kHz, ±0.5 Hz (10 to 40 °C).
D/A Conversion: 24-bit.
Signal-to-Noise Ratio: = -85 dB (Bypass mode, de-emphasized, 20 Hz - 15 kHz bandwidth, referenced to 100% modulation, unweighted).
Distortion: = 0.02% THD (Bypass mode, de-emphasized, 20 Hz - 15 kHz bandwidth, referenced to 100% modulation, unweighted).
Stereo Separation: At 100% modulation = 3.5 Vp-p, > 60 dB, 30 Hz - 15 kHz. At 100% modulation = 1.0 - 8.0 Vp-p, > 55 dB, 30 Hz - 15 kHz.
Crosstalk-Linear: = -80 dB, main channel to sub-channel or sub-channel to main channel (referenced to 100% modulation).
Crosstalk-Non-Linear: = -80 dB, main channel to sub-channel or sub-channel to main channel (referenced to 100% modulation).
38 kHz Suppression: = 70 dB (referenced to 100% modulation).
76 kHz & Sideband Suppression: = 80 dB (referenced to 100% modulation).
Pilot Protection: -60 dB relative to 9% pilot injection, ±250 Hz (up to 2 dB composite processing drive).
Subcarrier Protection: (60-100 kHz)= 70 dB (referenced to 100% modulation; with up to 2 dB composite limiting drive; measured with 800 line FFT analyzer using "maximum peak hold" display).
57 kHz (RDS/RBDS) Protection: -50 dB relative to 4% subcarrier injection, ±2.0 kHz (up to 2 dB composite processing drive).
Connectors: Two BNC, floating over chassis ground, EMI suppressed.
Maximum Load Capacitance: 0.047 µF (0 ? source impedance). Maximum cable length of 100 feet / 30 meters RG-58A/U.
Filtering: RFI filtered.
Subcarrier (SCA) Inputs
Configuration: Subcarrier inputs sum into composite baseband outputs before digitally controlled composite attenuator.
Impedance: > 600 ?.
SCA Sensitivity: (Both Inputs) Variable from 220 mV p-p to >10 V p-p to produce 10% injection. Two trim pots, adjustable from the rear panel, set sensitivities.
Connectors: Two BNC, unbalanced and floating over chassis ground, EMI suppressed.
19 kHz Pilot Reference: SCA2 input jack can be jumpered to provide a 19 kHz pilot reference output or to serve as a second SCA input.
Remote Computer Interface
Supported Computer & Operating System: IBM-compatible PC running Microsoft Windows® 2000 (SP3 or higher) or XP.
Configuration: TCP/IP protocol via direct cable connect, MODEM or Ethernet interface. Suitable null modem cable for direct connect is supplied. Modem and other external equipment is not supplied.
Serial Connectors: RS232 port (3) DB-9 male, EMI-suppressed. Serial Connector 1 uses PPP to provide for direct or modem connection to the 8500 PC Remote application. Serial Connector 2 supports communication to a computer or remote control system via simple ASCII commands for administration and recalling presets. Serial Connector 3 is reserved for future developments.
Ethernet Connector: Female RJ45 connector for 10-100 Mbps networks using CAT5 cabling. Native rate is 100 Mbps. Provides for connection to the 8500 PC Remote application through either a network, or, using a crossover Ethernet cable, directly to a computer.
Ethernet Networking Standard: TCP/IP.
Remote Control (GPI) Interface
Configuration: Eight (8) inputs, opto-isolated and floating.
Voltage: 6 - 15 V AC or DC, momentary or continuous. 9 VDC provided to facilitate use with contact closure.
Connector: DB-25 male, EMI-suppressed.
Control: User-programmable for any eight of user presets, factory presets, bypass, test tone, stereo or mono modes, analog input, digital input.
Filtering: RFI filtered.
Configuration: NPN open collector.
Maximum Voltage: 30 V DC, reverse-polarity protected.
Maximum Current: 30 mA.
Voltage: 100 - 132 V AC or 200 - 264 V AC, switch-selected on the rear panel, 50 - 60 Hz, 50 VA.
Connector: IEC, EMI-suppressed. Detachable 3-wire power cord supplied.
Grounding: Circuit ground is independent of chassis ground can be isolated or connected with a rear panel switch.
Safety Standards: ETL listed to UL standards, CE marked.
Operating Temperature: 32 to 122 °F / 0 to 50 °C for all operating voltage ranges.
Humidity: 0 - 5% RH, non-condensing.
Dimensions (W x H x D): 19" x 5.25" x 15.5" / 48.3 cm x 8.9 cm x 39.4 cm. Depth shown indicates rack penetration; overall front-to-back depth is 17.75" / 45.1 cm. Three rack units high.
RFI / EMI: Tested according to Cenelec procedures.
Shipping Weight: 40 lbs. / 18.1 kg