To be precise for transmitting WSPR on 20m:
the actual TX frequency must be inside the mentioned block for WSPR:
20m: 14.097000 – 14.097200 MHz
Now if we use the Beacon mode of a QMX machine then we have to choose the frequency exactly inside that band. For example 14.097130 MHz
But if you do the WSPR using for example the WSJT-X program then by choosing the WSPR mode you get set the 14.095600 MHz. To get the actual transmit frequency you have to add an offset set in the WSJT-X program. Normally this offset is set to 1500Hz. So if nobody changes that all WSPR transmissions would be at 14.097100 MHz. This would be very unfortunate. It is a very good practice to change this offset. For the mentioned example of the output frequency 14.097130 MHz the offset would have to be 1530 Hz.
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73 Bojan S53DZ
