USER'S GUIDE
OPERATING MODES
PK232UG Rev. B 9/86
4-6
59
4.3.3
CCITT On/Off
Use the
CCITT
command when operating Baudot RTTY to select the correct character
translation between the standard "American keyboard" and the internationally standar-
dized keyboard used outside the U.S.A. The CCITT option automatically translates your
typing into International Telegraph Alphabet Number 2 (ITA #2) to avoid character con-
flicts when working stations overseas. (Part 97.69 of the FCC Rules calls for this code
when operating Baudot RTTY.)
If
CCITT
is set ON, characters typed on the keyboard or loaded from disk files are trans-
lated into CCITT ITA #2 before being sent. If
CCITT
is set OFF, characters sent to the PK-
232 are not translated into CCITT ITA #2, but remain in the American standard Baudot
format (typically Western Union). For a description of the keyboard configurations, see the
CCITT
command in Chapter 5, Command Summary.
4.3.4
Unshift-On-Space (
USOS
)
Unshift on space automatically changes the program to the LETTERS or lower case condi-
tion after the "space" character is received.
When operating Baudot RTTY under poor HF receiving conditions, a received LETTERS-
SHIFT character can be garbled, or another character can be wrongly interpreted as a
FIGURES-SHIFT character. Many otherwise good characters received after this point would
be interpreted as "upper case" (number and punctuations), rather than the lower case let-
ters typed by the originating station.
USOS
helps reduce reception errors under these conditions. However, be aware that some
commercial, weather and utility RTTY services send consecutive groups of numbers sepa-
rated by spaces. In these cases, the use of
USOS
will produce unacceptable results by re-
turning the system to lower case characters when the originator may have intended the
data to be upper case characters.
4.4
ASCII RTTY Operation
From the Command Mode, type
ASCII
or
AS
, followed by a
<RETURN>
to enter the
ASCII RTTY mode. The PK-232 will respond with the previous mode:
OPMODE was Baudot
o
Type
X
to turn on your transmitter.
o
Type
K
to enter the Converse Mode and begin the contact.
o
Type
<CTRL-D>
to shut off your transmitter and return to the Command Mode, or
o
type
<CTRL-F>
to send your callsign in Morse and shut off your transmitter and re-
turn to Command Mode, or
o
type
<CTRL-C>
to return to the Command Mode.
o
Type
R
to shut down your transmitter and end the contact.
Содержание PAKRATT PK-232
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