14
Figure 3.1 Location of Controls and Keys
As soon as you type the first character of a series, the keyboard will begin transmitting it. You may then
type two more characters, even though transmission of the first one has not been completed. The keyboard
will "remember" characters and transmit them in the proper sequence. To help you pace your typing, the
MEMORY FULL lamp will light when three characters have been stored. Simply wait until the light goes out,
indicating that there is room for another character in the memory, before your next keystroke. If you should
happen to press another key while the memory light is on, the last character in the memory will be replaced
with the new one typed.
The n-key rollover feature means that you do not have to release a key before striking the next one. The
keyboard will transmit the characters in the proper order.
Another operating convenience of the keyboard is the Line length indicator. If you type more than 64
consecutive printing characters, the END OF LINE lamp will light and an audio tone will be emitted as a
reminder to send a carriage return and linefeed. Non-printing characters, such as Linefeeds and blanks, are
not counted as part of the 64 characters, This warning feature is particularly useful when you are punching
paper tape.
Five standard RTTY control keys are provided. The LINEFEED, RETURN (carriage return), and BLANK
keys perform their normal functions of advancing the printer paper one line, returning the carriage to the
left margin, and punching blank characters on paper tape, respectively. Although the keyboard produces all
required figures-case and letters-case codes automatically, a figures (FIGS) key and letters (LTRS) key are
provided so that you may manually shift the case of the receiving teleprinter. It is not necessary to use
these keys when transmitting characters which appear on the upper half of the keytops. Instead, use one of
the SHIFT keys as described previously. The keyboard will automatically transmit the figures-case code, and
will also return the printer to letters case the next time a letter key is struck.
The keyboard includes a number of special keys which simplify RTTY operation by automatically
transmitting strings of several characters at a single keystroke. The key labeled QBF produces the standard
RTTY test signal: "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG'S BACK Ø123456789". It is not
necessary to hold the key down once the message has started. If, however, the key is held down through
the end of the sequence, the entire message will be repeated.
A station identifier, actuated by the HERE IS key, is preprogrammed to transmit the letters "DE", followed
by your station call sign. The sequence will be repeated as long as the key is held down.
The CQ key produces the letters "CQ" followed by a space. Another special key, labeled AUX (for
auxiliary) can be preprogrammed to transmit any group of three characters. On factory-assembled
keyboards, this key is programmed with the characters requested by the purchaser when the keyboard was
ordered. If not specified, it is programmed to produce the letters "DX" followed by a space. Kit builders may
select the characters at the time of construction. Both keys repeat their character sequence if held down.
Summary of Contents for DKB-2010
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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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