K1EL
WKUSB-AF User Manual
WKUSB-AF
WKUSB-AF User Manual
5/19/2022 Rev 1.0
Page 61
start and end of transmission. A good starting value is 50 for both lead in and tail. Once the transceiver is
configured to operate in RTTY mode you are ready to go. The only other configuration decision is whether diddle
should be on or off. The recommendation is to use diddle to fill in the empty space between paddle input letters.
Be sure that WKUSB-AF internal sidetone speaker is enabled (the
A
paddle command) so that you can monitor
paddle dit/dah entry.
To start a RTTY transmission, enter the Morse code di-dah-di-dah. This will key your transceiver and a CRLF
sequence will be sent followed by diddle if enabled. . As you enter letters on the paddle you will hear them
through the internal sidetone speaker. After each character has been completed, it will be sent in RTTY FSK
Baudot. FSK audio will also be output through the audio port. If you don’t want to listen to that, just turn WKUSB-
AF’s audio volume down and monitor it through your transceiver. It can be confusing but some ops like to hear
both. It is possible to overrun the RTTY input buffer if you send Morse very fast, about 20 - 25 WPM works well.
To insert a CRLF, enter the Morse code DAH-DAH-DAH-DAH. For tuning or testing, an RYRYRY string can be
generated by entering the Morse code DAH-DAH-DAH-DIT. When you are done sending enter di-dah-di-dah
which will unkey the transceiver and return you to receive mode.
Enter a test message into one of WK’s message slots. If you want to send a message, simply press the message
button and the transmit process will proceed automatically. You do not need to insert the di-dah-di-dah codes
into a message, WK will automatically do that for you. There are two banks of six messages to work with.
Some ops like to set up one User for RTTY and the other for CW. That way you can switch back and forth with a
user toggle command (
XU
). If you use some thought you can load messages that will work for both modes.
As in host RTTY mode, a lead and tail time should be set to help the receiving station quickly sync to your
transmission. Recommended values are 50 for both lead in and tail delay.
While paddle RTTY is not as easy as keyboard, it does provide a way of operating RTTY with minimal
equipment, especially if you have a transceiver that will decode and display received RTTY.
When RTTY is enabled, pressing and holding PB2 for two seconds will put the keyer in Mark tune mode. The
CPO will send out the Mark tone and Key and FSK will be sent out the output ports. To cancel, press the CMD
pushbutton. If PB3 is pressed for 2 seconds, the space tone will be heard along with Key and PTT assertion.
How the outputs are formatted will depend on the FSKMAP and Reverse settings.