Features

• Modular design with complete Erase, Bias, Record, Reproduce and "Recordist Monitor" functions

• Automatic Bias, Level and EQ Swithcing

• OLX™ (Oxide Linearity eXtension) predicts, cancels and eliminates THD and IM distortions.

• HFX™ (High Frequency eXtension) program-adaptive biasing

• Two sets of non-interactive IN/OUT timing adjustments

• LINEUP mode with front panel "trim" adjustments for Bias, Record Level and Record EQ.

Specifications

Overall Frequency Response

• 35mm/ ± 1.5dB, 25Hz - 20kHz
• 16mm/ ± 2dB, 20Hz - 12kHz

Signal-to-Noise Ratio

• in dB, referred to a “peak” flux level of 370nW/m, or 6dB above Operation Level
• 35mm/ OVERALL(u’wtd -67/A-wtd -75)
• 35mm/ STANDBY(u’wtd -74/A-wtd -82)
• 16mm/ OVERALL(u’wtd -63/A-wtd -70)
• 16mm/ STANDBY(u’wtd -70/A-wtd -77)

Distortion

• Oxide-induced distortion will reach aproximately 1% THD at a fluid level of 290W/m, or approximately 4dB above Operating Level. (This depends on an oxide formulation.)
• Distortion in the electronics is >0.1% at any level up to signal clipping. The electronics internal clipping points are at least 20dB above typical operating levels.

Equalization

35u-sec for 35mm tests, 70u-sec for 16mm, and a “flat” low frequency characteristic per the SMPTE Specification. Equalization presets are automatically switched with jumpers in plug-in head assemblies.

Line Input

Transformerless, electronically-balanced/bridging; appears at the back panel “XLR” female connector. Differential input impedance >10k-ohms; accepts nominal program line levels between -5dBu and +15dBu, +4dBu nominal. (0dBu = 0.775V r.m.s.). Common Mode Rejection >40dB.

Line and Recordist Monitor Outputs

Transformerless, electronically-balanced; appear at 600-Ohm source impedance; clipping level +24dBm into 600-Ohm load.

Erase Frequency

125kHz

Erasure

<75dB erasure of 500Hz signal recorded at or below oxide saturation.

Bias Frequency

250kHz

IN/OUT Timing

Separate, non-interactive adjustments for 35mm and 16mm film speeds. IN and OUT timing delays are each independently variable between 40 and 500ms.

Head Requirements

• Erase: 2mH, ±10%, with >90% magnetic efficiency at 125kHz; dual-gap construction.
• Record: 5mH, ±20%, with >80% magnetic efficiency at 250kHz; recommended gap spacer, 200u-inches.
• Reproduce: (Recordist Monitor) 5mH, ±20%; recommendedgap spacer 200u-inches.

Power Requirements

The Model 390 Channel Modules each require a preregulated bipolar supply of ±118vdc at 350ma, and a 500kHz Erase/Bias “pilot” signal of 15 volts p-p. The Inovonics Model 990 Power Supply, which satisfies these requirements for a system of 8 channels or less, operates fro 115/230-volt AC mains, 50/60Hz, and draws about 120 Watts fully-loaded

Line Output

Balanced, transformer-isolated, with provision for balanced, transformerless operation if desired. May be adjusted for nominal line levels between +4 and +10dBm. Clipping level, +28dBm into 600-ohm load; +30dBmV into bridging inputs.

Size and Weight

• 390 Channel Modules: 7 x 4.3 x 8”: 4lbs.
• 990 Power Supply: 3.5 x 19 x 10” (2U); 17 lbs.
• 999 Rack Frame: 7 x 19 x 8” (4U); 3lbs.