Table of Contents
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106-0331-100
SECTION I
APPLICATION DATA
1.1
INTRODUCTION
The Kennedy Model 331 Cartridge Recorder is a
rugged tape handler expressly designed for high re-
liability digital data recording.
.
The machine utilizes the 3M DC300A converter 1/4
inch data cartridge, which features a unique isoelastic
drive system for maintaining constant tape tension
and tape motion with a single drive motor. Drive
power is provided by a high quality AC motor/tach-
ometer velocity servo system which provides both
tape and reel drive. The cartridge contains 300 feet
of 0.25 inch computer grade tape, along with internal
tape guides to ensure reliable recording.
The Mode1331 is fully bidirectional at 25 ips normal
speed, resulting in a data transfer rate of 40,000
bits per second at 1600 cpi recording density. For-
ward and reverse search modes as well as rewind
speed are 90 ips.
The drive can be equipped with a variety of heads
for maximum flexibility. One, two and four-track
versions are available. Each track is treated in-
dependently, allowing cartridge interchange between
transports of differing track configurations. Every
track is equipped with a separate erase gap to ensure
against inadvertent data erasure.
The Model 331 is designed to meet the requirements
of the proposed ANSI standard for quarter-inch car-
tridges.
The standard provides for a recording
density of 1600 cpi written in aphase encoded format.
A 16 character preamble precedes the data for read
synchronization. Data is followed immediately by a
16 character CRC and then a 16 character postamble.
Record gaps are 1. 2 inches minimum.
The write electronics in the Model 331 consists only
of head drivers. The proper phase encoded data in-
cluding preamble, CRC and postamble must be pre-
sented to the unit in the correct serial order.
.
Read electronics consist of preamplifiers and cross-
over detectors. Outputs are in digital form, TTL
compatible.
The Model 331 provides an extremely reliable means
of storing digital data.
It
is well suited
to
use as a
programming device for minicomputers, a storage
1·-1
•
device for terminal and pOint-of-sale systems, and
any other data processing applications requiring
maximum capability in minimum space.
1.2
ELECTRICAL/MECHANICAL SPECIFICATIONS
Table 1-1 lists the general specifications for the
Model 331. Figure 1-1 is an outline and installation
drawing for this unit.
Cartridge type
3M, DC300A Isoelastic
Data Cartridge
Tape width •• •
0.25 inch, 1. 0 mil
Tape length • • • • • • • •
• • • 300 feet
Recording density. •
• • • • • • • 1600 bpi
Number of tracks.
• •••• 1, 2, or 4
Recording head. •
Dual gap read-after-write
wi th separate erase bar for each track
Record format • •
Single track, phase encoded
Record mode • • • • • • •
Single track serial
Normal tape speed • • • • • • • • • • • • • • 25 ips
Rewind/search tape speed • • • •• 90 ips nominal
Start/stop time • • • • • • at 25 ips, 30 ms ±1 ms;
at 90 ips, 120 ms nominal
Start/ stop displacement ••• at 25 ips, 0.375 inch;
at 90 ips, 5. 4 inches nominal
Transfer rate • • • • • • • • 40,000 bits per second
Instantaneous speed variation
• • ±5 percent
Long term speed variation •
• • ±!2 percent
Write
Bidirectional
Read • • • • • • • • • •
Power requirements
Weight. •••
Bidirectional
• • +5 vdc at 0.5 amp
±24 vdc at 3 amps peak
(unregulated)
• 3.75 pounds
Dimensions • • • • • • • • • • • • 6.5 inches wide,
4.75 inches high, 8.625 inches deep
(16.51 em x 12.06 em x 21. 9 em)
Interface • • • • • • • • • • • • DTL/TTL low true
Table
1-1.
Specifications
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