Sony DTC-87ES Operating Instructions Manual page 43

mrvelalalrerslmlayielanerciileyal
To record and playback the digital signal converted from
the analog signal, a recording/playback system which
ensures the frequency range of a few megahertz is
necessary. Since this is very difficult for conventional
stationary head system, the DAT deck adopted a helical
scan system with rotary heads which provides fast relative
tape speed. In addition, the DAT uses metal tape. These
factors provide a high density recording of 114 Mbit/inch?.
The DTC-87ES employs a 2-head system with the tape
wrapping around 90° for smooth and stable tape transport.
Tape Format and Construction of DAT Cassette
The tape format of DAT and construction of DAT cassette is ef
illustrated below, Although the width of tape is the same as a
conventional audio cassette tape, the tolerance is very
strict as much as +0/-0.02 mm.
The cassette shell has sealing mechanism to prevent
contamination of the tape.
20°
Plus azimuth «
20°
Minus azimuth o
BV
Tape edge
Tape format
48 kHz mode, 44.1 kHz mode, 32 kHz | 44.1 kHz wide track ol
mode, 32 kHz-LP mode, 32 kHz-4ch mode (for contact printing)
Tape width (mm) 3.81 (+0, -0.02)
Width of recording area (mm)
Track length 23.501 23.471
Track pitch (mm) 13.591 20.41
B | Track center (mm) 1.905
C | Optional track 1 (mm) 0.5
| | Optional track 2 (mm) 0.5
E | Edge guard 1 (mm) 0.1
F | Edge guard 2 (mm) 0.1
® | Track angle (degrees) 6°22'59.5" 6°23'29.4"
a. | Head gap azimuth +20°(+15')
angle (degrees)
Note
With <@30 (mm) head drum, wrap angle is 90.0°, and still angle is 6° 22'.
43