On Fri, Nov 17, 2023 at 11:52?AM Ashhar Farhan <farhanbox@...> wrote:
The KX3 is a direct conversion transmitter. It has a single oscillator at the tx frequency. It will have no spurs, only the harmonics, and the push-pull power chain can null the 2nd order harmonics very well.
The reason we didn't opt for it was that the IMD as well as the images are not very well controlled.
For instance, on sbitx the opposite sideband is non existant. On kx3, -55dbc is your best case.
Thanks very much, Bob!? ?Those look like they generally agree with what I found (after correcting for the problems with D20/D21).? ?You and I also see some increase in the noise spectrum around the fundamental, and some spurs that are right around the limit, but the low pass filters are doing a fine job on the harmonics.? ? Thanks also for including the KX3 for comparison!
