With earlier QRP Labs you had to set a frequency of the official dial frequency? plus 1500 Hz plus or minus 100Hz. This is because a conventional SSB Tx would take a tone in the range 1400 - 1500 Hz and transmit this as upper sideband, whereas the QRP Labs equipment outputs directly.?
As far as I know QMX works the same, but I've not tried WSPR on my QMX.
