4
DKB-2010 SPECIFICATIONS
RTTY MODE
Code:
International Teletype, Baudot
Character Format:
1 start bit (space)
5 data bits (mark or space)
1.5 stop bits (mark)
The duration of each bit is one select time,
determined by the transmission rate. The minimum
stop bit length for Baudot code ranges from 1 to
1.46 bits, depending on transmission rate and
application.
Data Sense:
Mark or "1": holding condition, output con-
ducting.
Space or "0": signaling condition, output noncon-
ducting.
Character Transmission Rates:
60 words per minute, 45.45 baud.
Select time: 22 msec.
66 words per minute, 50.0 baud.
Select time: 20 msec.
75 words per minute, 56.9 baud.
Select time: 17.57 msec.
100 words per minute, 73.7 baud.
Select time: 13.47 msec.
Also available on special order:
132 words per minute, 100 baud
Select time: 10 msec.
Transmission Rate Accuracy:
Crystal controlled to within ± .05 % for ambient
temperatures from 50 to 95 °F (10 to 35 °C).
Output Interface:
Isolated loop switching transistor.
Ratings:
Voltage, nonconducting: 250 V DC
Current, conducting: 80 mA DC
Isolation voltage rating:
Either loop connection to chassis and ground 250
V AC or DC.
Output Power Rating: 1 Watt.
RTTY Keyfunctions:
10 numeric (0 through 9)
26 alphabetic (A through Z)
15 punctuation marks:
. , : ; / " - ! " # & $ () '
3 carriage control keys: linefeed
carriage return, and blank
2 shift keys
1 break key
2 manual case-change keys
2 three-character memory keys (CQ and AUX)
(repeating)
Unless otherwise requested, AUX key transmits
"DX" plus a space.
1 identifier key (HERE IS) (repeating)
1 test message key (QBF: "quick brown fox")
(repeating)
1 space bar
Identifier:
Transmits the letters "DE" followed by the pre-
programmed station call sign of up to 12
characters when the HERE IS key is struck.
Message repeats as long as key is held down.
Test Message Generator:
Transmits the message "THE QUICK BROWN FOX
JUMPS OVER THE LAZY DOG'S BACK
Ø123456789" when the QBF key is struck.
Repeats if key is held down.
End-of-Line Warning:
Panel lamp lights and audio tone burst is emitted
if more than 64 printing characters are trans-
mitted without an intervening carriage return.
Character Buffer Memory:
Stores up to three characters if typing speed
exceeds character transmission rate. Panel lamp
warns when memory is full. Optional 64 and 128
character buffers are available.
N-Key Rollover:
New key may be pressed before the preceding
key is released.
Automatic Case Shift:
Numbers may be transmitted without use of the
shift key; case shift codes are transmitted auto-
matically.
Summary of Contents for DKB-2010
Page 1: ......
Page 20: ...18...
Page 39: ...37 Table 4 3 ROM Converter Input and Output Codes...
Page 52: ...50 Figure 6 1 Logic Circuit Board Test Points...
Page 53: ...51 Figure 6 2 Keyswitch Circuit Board Test Points...
Page 54: ...52 Figure 6 3 Power Supply Circuit Board Test Points...
Page 57: ...55 Table 6 4 DKB 2010 Wire List...
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Page 96: ...A1 EXTENDED MEMORY OPTION FOR THE DKB 2010 KEYBOARD INSTRUCTION MANUAL...
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