Operating instructions

7.1 Tape Transport
Tape Width And Tracks 1-inch (25.4 mm) 8 tracks* *manufactured to order
2-inch (50.8 mm) 16 tracks
2-inch (50.8 mm) 24 tracks
Heads Plug-in head blocks with full access to independent head azimuth
adjustment.
Motors 1 DC capstan motor;
2 fully servoed DC reel motors.
Reel Size Up to 14 inches diameter (35.63 cm)
NAB hub with reel size auto sensing
Tape Speed 30 ips (76.2 cm/s) and 15 ips (38.1 cm/s)
15 ips (38.1 cm/s) and 7.5 ips (19.05 cm/s)* *manufactured to order
Tape Speed Accuracy max. ±0.1%
Tape Speed Deviation max. 0.05% (from beginning to end of reel.)
Pitch Control ±20% continuously variable control, percentage or ips readout with 0.01%
precision.
Wow and Flutter 30 ips: max. ±0.04%
(Peak wtd. per DIN 45507) 15 ips: max. ±0.05%
7.5 ips: max. ±0.08%
Start Time (with 14" reels) 30 ips: max. 1.0 second
15 ips: max. 0.6 second
7.5 ips: max. 0.5 second
Stop Time (with 14" reels) 30 ips: max. 1.0 second
15 ips: max. 0.6 second
7.5 ips: max. 0.5 second
Fast Wind Time min. 85 seconds for 2400 feet (760 m) tape.
Drive System Pinchrollerless direct drive capstan system with ±20% speed control.
Constant tension servo-controlled reel motors.
Cue Control Rotating Cue knob for variable speed tape winding (bidirectional)
proportional to cue knob rotating; button also defeats tape lifters in fast wind
and rewind modes.
Tape Time Counter Six-digit LED readout from tachometer/logic measurement circuit; indicates
hours, minutes, seconds, and tenths of seconds.
Section 7 Specifications
7 - 2
October 1990
MTR-90III Operation and Maintenance Manual