Various examples from the screenshot above:
VFO.A 1840000
sets the VFO A frequency to 1.84 MHz
FA00001840000;
CAT command from WSJT-X MHz
ERR: Band
Error message “Band”
In this example, a CAT command was received from WSJT-X, to set the QDX to frequency 1.84
MHz. The CAT command is “FA00001840000;” - Note that the entries in the log file are not quite in
chronological order, since the VFO update event is printed BEFORE the CAT command event; the
reason for this is that the CAT evaluation must be completed in totality before the CAT command
log event takes place, because only then do we know if the CAT command was successful. The
final entry is an error message “Band” because 1.84 MHz is in the 160m band and this is not one
of the bands currently supported by QDX.
VFO.A 7074000
sets the VFO A frequency to 7.074 MHz
FA00007074000;
CAT command from WSJT-X MHz
Band 40m
Sets the band to 40m
The operator then realizes his error setting QDX to 160m in the WSJT-X drop-down and chooses
40m instead; this time the CAT command successfully sets frequency and band.
IF; IF00007074000 +00000000003000000 ;
Here the “IF;” or Information request CAT command is received from WSJT-X and QDX replies
with the CAT information string in the prescribed format.
For reasons known only to itself, WSJT-X likes to ask for the information screen multiple times in
quick succession even though the result is the same.
QDX operating manual; firmware 1_04
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