here’s a brief list of common commands with explanations of the Elecraft K3/KX3 programming language.
For a detailed reference please read the official “Elecraft K3 and KX3 Programmer’s Reference” manual that can be found here:
Each command consists of a command code and optionally a numeric/alphanumeric value. This is usually needed when you are setting or sending values.
All the command have to end with a semi column (;).
I’ll be explaining how to set/send things for your KX3 KeyApp buttons/switches.
MODEs (Command: MD)
Sets LSB Mode
Sets USB Mode
Sets CW Mode
Sets FM Mode
Sets AM Mode
Sets DATA Mode
Sets CW REV Mode
Sets DATA REV Mode
Mode 6 (MD6) is used in conjuction with the DT command to set the sub mode (DATA A/AFSK A/FSK D/PSK D)
Sets DATA A
Sets AFSK A
Sets FSK A
Sets FSK D
Sets PSK D
FREQUENCY (Commands: FA and FB)
FA sets the frequency for VFO A
FB sets the frequency for VFO B
The number has to be an 11 chars number
to set VFO A frequency to 7.070 Mhz
to set VFO B frequency to 14.200 Mhz
POWER OUT (Command: PC)
Sets Power to 0W
Sets Power to 1W
Sets Power to 5W
Sets Power to 10W
Sets Power to 100W
FILTER BANDWIDTH (Command: BW)
Sets filter bandwidth to 1500Hz
Sets filter bandwidth to 700Hz
Sets filter bandwidth to 50Hz
BUTTON/SWITCH EMULATION (Command: SWH/SWT)
SWT stands for Switch emulation TAP
SWH stands for Switch emulation HOLD
After the SWT/SWH you have to put a two number code based on the following table
10 FREQ ENT
11 MSG (<-)
44 ATU TUNE (.)
16 XMIT (0)
32 AF/RF-SQL (7)
19 PRE (1)
27 ATTN (2)
20 APF (3)
28 SPOT (4)
21 CMP (5)
29 DLY (6)
33 PBT I/II (8)
34 KEYER/MIC (9)
24 REV (FM/RPT)
So, for example, to switch one band up (BAND+) the command is:
To start the ATU auto tuning (ATU TUNE) the command is:
To enable/disable text decoding the, command is:
MENU SELECTION (Commands: MN, MP)
They let read/write options value in the options menu.
There’s a table with all the table codes at page 17 of the above linked manual.
So for example, if you want to turn Off the backlight, the command is:
Let’s see what that means:
is to recall the BACKLIGHT option (see table on page 17 of the Programmer’s Reference PDF)
sets the value to ON
exits the menu. Remember to always add that when you’re done with the menu options!
Most of the options require byte values. If you want an easy way to know what to send based on each of the possible options you can set it manually on the KX3 and then READ the MP value for the selected value option with the Elecraft Utility.
For example if you want to know the MP value for BACKLIGHT ON:
- in the KX3 manually set to option to BACKLIGHT ON
- open the KX3 Utility
- go in the terminal tab
the result will be the MP value you’ll have to put to have the same effect.
SEND MESSAGE (Command: KY)
KY MESSAGE; or KYWMESSAGE; are the commands to be used to send CW/PSK/RTTY messages.
To send a CQ message the code is:
KYWCQ CQ DE IU4APC SK;
The W tells the KX3 to wait for the message to be sent before elaborating what’s after the “;” (command may be concatenated).
Also remember that there’s a limit in the number of chars after the KY(W) command of 26 chars.
So if you want to send a longer message you have to split the message in multiple KY(W) commands.
For example, to send “CQ CQ CQ DE IU4APC IU4APC IU4APC CQ PSE K” (41 chars)
KYWCQ CQ CQ DE IU4APC IU4APC;KYW IU4APC CQ PSE K;
All the commands can be concatenated.
So for example if you want to switch frequency to 7.070Mhz, change mode to CW and send a CQ message:
FA00007070000;MD1;KYWCQ CQ DE IU4APC SK;
One more thing… I suggest you to change mode AFTER a change of frequency.