On 24/09/2021 23:12, firstname.lastname@example.org wrote:
Hi -Hi Marty,
one reason may be that users who do not have CAT control of their rigs are following our advice to use Tx audio offsets above 1500 Hz. This ensures that any unwanted audio harmonics are greatly attenuated by the rig's Tx IF filter. Of course they can elect to tune their VFO dial down 1 or 1.5 kHz if they wish to get to those lower frequencies.