K1EL K45 CW Modem Manual K45
K-45 User’s Manual - Rev A.0
6/6/2021
Page 17
When the K45 is set to RTTY mode, it will transmit in Baudot only and Morse transmission is disabled. The
transmit window acts the same way it does for Morse operation with the exception that Baudot strings must
be delimited by square brackets. A starting
[
keys the transceiver and the user can then send Baudot on the
keyboard. When finished, entering a
]
will unkey the transceiver ending transmission. it. For example:
RTTY 1 IDLE
[CQ CQ CQ DE K1EL K1EL
K1EL PSE K][W8RTY W8RTY
DE K1EL K1EL K]
Figure 11 – RTTY Operational Display
Using delimiters ensures that the transmitter is keyed and stable before starting FSK, an additional lead in
delay time is usually required. Also, to prevent character chopping when transmit is turned off a tail delay is
also usually required. PTT is asserted on the leading
[
and held till the trailing
]
. Any text keyed outside the
brackets will be ignored. For typeahead press INSERT before entering the delimited string and when ready
to send, press INSERT a second time. After sending has started, the forward slash character
/
will clear the
transmit buffer and RTTY transmission will stop immediately. The right brace
}
will force a CRLF sequence:
CR CR LF LTRS. (The ENTER key will also generate a CRLF).The left brace
{
will initiate an RYRYRY test
pattern that runs for a line of 45 characters and the stops. All ASCII characters which map to Baudot
characters are accepted and printed. The only non-printing Baudot characters acted on are the brackets
[ ]
,
slash
\
, left brace
{
, and right brace
}
. Commands relating to Morse are ignored. Those acted upon are
shown below.
1) Tuning command ^T
2) Transmit Pause (INSERT)
3) Clear Tx buffer (DEL)
4) Set PTT Lead/Tail
CRLF handling
While transmitting, a carriage return/line feed ends the current line and starts a new one. This can be
handled in one of two ways.
1) A CRLF can be inserted manually using either the Enter or } keys.
2) Automatic CRLF can be enabled to automatically insert CR LF when the line length exceeds 45
characters.
RYRYRY Test
WK will send a long RYRYRY string automatically in response to a
{
character. It will automatically send
CRLF at the start of the test string.
RTTY Setup
The RTTY Setup Menu is initiated by
ESC-R
. Two menus are accessed using the Up and Down arrows.
Figure 12 – RTTY Setup Menu 1
RTTY On/Off
When RTTY is on, K45 will only transmit RTTY Baudot as configured in the menus presented here. Morse
function, including sidetone is disabled. Changes made to Morse related configuration will be recorded but
not utilized until RTTY is turned off which will re-enable Morse. CW paddles are ignored when RTTY is on.
FSK Assignment
FSK output can be mapped to either the K45’s Key output or the PTT output. The default, FSK=PTT, sets
the PTT output to be FSK and the KEY output to transmitter key. This is the way most transceivers with a
