FM Transmitters from Transmitters 'R' Us.

PERFORMANCE

Specifications apply for measurements from analog Left/Right input to stereo composite output and to FM analog Left/Right output.
Frequency Response (Bypass Mode): 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. The dynamic range of the A/D Converter, which has a specified overload-to–noise ratio of 110 dB, primarily governs it. 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 L / R Channel Separation: >50 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.
Processing Sample Rate: The 2300 is a “multirate” system, using internal rates from 32 kHz to 512 kHz as appropriate for the processing being performed. Audio clippers operate at 256 kHz (and are anti-aliased), while the composite limiter operates at 512 kHz.
Processing Resolution: Internal processing has 24 bit (fixed point) or higher resolution; uses Motorola DSP56362 DSP chips.

INSTALLATION

Analog Audio Input

Configuration: Stereo.
Impedance: >10k ohm load impedance, electronically balanced.*
Nominal Input Level: Software adjustable from –4.0 to +13.0 dBu (VU).
Maximum Input Level: +27 dBu.
Connectors: Two XLR-type, female, EMI- suppressed. Pin 1 chassis ground, Pins 2 (+) and 3 electronically balanced, floating and symmetrical.
A/D Conversion: 24 bit 128x oversampled delta sigma converter with linear-phase anti-aliasing filter. Converter outputs 64 kHz sample rate, which the 2300 then decimates to 32 kHz in DSP using an ultra-high-quality image-free synchronous sample rate converter.
Filtering: RFI filtered, with high-pass filter at 0.15 Hz (–3 dB).

Analog Audio Output

Configuration: Stereo. Flat or pre-emphasized (at 50 µs or 75 µs), software-selectable.
Source Impedance: 50 ohms, electronically balanced and floating.
Load Impedance: 600 ohms 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 ohms or greater load, software-adjustable.
Signal-to-Noise: >= 90 dB unweighted (Bypass mode, de-emphasized, 20 Hz–15 kHz bandwidth, referenced to 100% modulation).
L / R Crosstalk: <= –70 dB, 20 Hz–15 kHz.
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 AES/EBU standard, 24 bit resolution, software selection of stereo, mono from left, mono from right or mono from sum.
Sampling Rate: 32, 44.1, 48, 88.2, or 96 kHz, automatically selected.
Connector: XLR-type, female, EMI-suppressed. Pin 1 chassis ground, pins 2 and 3 transformer balanced and floating, 110 ohm impedance.
Input Reference Level: Variable within –30 dBFS to –10 dBFS.
J.17 De-emphasis: Software-selectable.
Filtering: RFI filtered.

Digital Audio Output

Configuration: Stereo per AES/EBU standard. Output configured in software as flat or pre-emphasized to the chosen processing pre-emphasis (50 µs or 75 µs), with or without J.17 pre-emphasis.
Sample Rate: Internal free running at 32, 44.1, 48, 88.1 or 96 kHz, selected in software. Can also be synced to the AES/EBU digital input at 32, 44.1, 48, 88.1 or 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 ohm impedance.
Output Level (100% peak modulation): –20.0 to 0.0 dBFS software controlled.
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 ohm voltage source or 75 ohm, jumper-selectable. Single-ended, floating over chassis ground.
Load Impedance: 37 ohm 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 degrees to 40 degrees 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 = 3.5Vp- 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 ohm 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 ohms
SCA1 Sensitivity: Variable from 220 mV p-p to >10 V p-p to produce 10% injection. Sensitivity is adjustable by an internal PC-board-mounted trim pot.
SCA2 Sensitivity: Fixed at 772 mV p-p to produce 10% injection.
Connectors: Two BNC, unbalanced and floating over chassis ground, EMI suppressed.
19 kHz Pilot Reference: SCA2 input can be re- jumpered to provide a 19 kHz pilot reference output.

Remote Computer Interface

Configuration: TCP/IP protocol via direct cable connect, modem, or Ethernet interface.
Serial Port: 115 kbps RS–232 port dB–9 male, EMI-suppressed.
Ethernet Port: 10 or 100 Mbit/sec on RJ45 female connector.

Remote Control (GPI) Interface

Configuration: Eight (8) inputs, opto-isolated and floating.
Voltage: 6–15V AC or DC, momentary or continuous. 9VDC 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.

POWER

Voltage: 100–132 VAC or 200–264 VAC, switch-selected on the rear panel, 50–60 Hz, 40 VA.
Connector: IEC, EMI-suppressed. Detachable 3- wire power cord supplied.
Grounding: Circuit ground is independent of chassis ground, and can be isolated or connected with a rear panel switch.
Safety Standards: ETL listed to UL standards, CE marked.

ENVIRONMENTAL

Operating Temperature: 32 ° to 122 ° F / 0 ° to 50 ° C for all operating voltage ranges.
Humidity: 0–95% RH, non-condensing.
Dimensions (W x H x D): 19” x 1.875” x 14.25” / 48.3 cm x 4.8 cm x 36.2 cm. One rack unit high.
Humidity: 0–95% RH, non-condensing.
RFI / EMI: Tested according to Cenelec procedures. FCC Part 15 Class A device.
Shipping Weight: 19 lbs / 8.7 kg

WARRANTY

Two Years, Parts and Service: Subject to the limitations set forth in Orban's Standard Warranty Agreement.

Because engineering improvements are ongoing, specifications are subject to change without notice.

* No jumper selection available for 600 ohm. Through-hole pads are available on I/O module for user-installed 600 ohm termination.