Timewave DSP-232, Operating Manual

Page: 143 / 271

Chapter 8 ASCII and Baudot Operation
WRU—(W)ho a(R)e yo(u)?—allows you to request the identity of the station you're conversing with by typing
(
CTRL+E
). This causes the DSP to send a FIGS-D request to the other station. For this reason, you should set your
own
AAB
message to
DE
(
your callsign
) . If you turn
WRU ON
, your station will automatically send your
AAB
message when another station requests your identity. With WRU OFF —or if AAB is empty—your station will
ignore this request.
WORDOUT
Some Baudot/ASCII users like to have their words sent out only when they are complete, rather than individual
letters sent as they’re typed. Turning
WORDOUT ON
allows the word you’re currently typing to be edited as long
as you haven’t pressed the ( SPACE ) bar or any punctuation and control characters.
Operating on the “Wrong” Sideband
By Amateur radio convention, BAUDOT is used while in LSB. If you find a station operating on USB, you can
reverse your receive “sense” with
RXREV to copy him. Likewise, if someone tells you that you are on the wrong
sideband you can correct your transmit signal sense using
TXREV
, but ideally you should just switch to LSB and
adjust your frequency accordingly.
Letters and Figures Case
In the old days, two keys were used on mechanical teletype machines to shift between punctuation and letters and
numbers since 5-bit Baudot is limited to 32 different characters. The DSP takes care of sending “FIGS” and
“LETTERS” automatically so no separate keystroke is required.
Unshift-On-Space—
USOS —automatically changes the received Baudot/Murray code characters to the LETTERS
or lowercase condition after any “space” character is received.
When operating Baudot RTTY under poor conditions, a received LETTERS-SHIFT character can be garbled, or
another character can be wrongly interpreted as a FIGURES-SHIFT character. Turning
USOS ON
helps reduce
reception errors under these conditions.
Some commercial, weather and utility RTTY services send groups of numbers separated by spaces. When receiving
such non-amateur signals,
USOS
should be off to prevent displaying LETTERS-shifted characters when the
originator may have intended the data to be FIGURES-shifted.
Function Keys
The following immediate commands and “Function Keys” are included for RTTY operating convenience:
K
(or Converse) Loads the transmit type-ahead buffer
L Forces LETTERS case. (Baudot)
N
Forces FIGURES case. (Baudot)
R Switches you to the receive mode and forces LETTERS case.
X
Switches you to the transmit (Converse) mode.
Control keys functions that you can embed in transmitted text:
(
CTRL-B
) Sends your AAB string as a “HERE-IS” message
( CTRL-D ) Stops sending when the transmit buffer is empty
(
CTRL-E
) Sends a “Who Are You?” (WRU) request to the other station
( CTRL-F ) Sends your callsign in Morse and shuts off your transmitter when the transmit buffer is
empty
( CTRL-J ) Carriage Return
(
CTRL-M
) Line Feed
( CTRL-N ) Sends FIGURES character (Baudot)
(
CTRL-O
) Sends LETTERS character (Baudot)
(
CTRL-T
) Sends the time if the
DAYTIME
has been set and the date if
DAYSTAMP
has been
enabled.
September, 05 8-5