A common cause of incidental AM is ripple in the crystal filter(s) in
use. One reason I went to the 2.8 kHz filter was that it had less
ripple, and the difference was obvious on RTTY.
73, Jim K9YC
On 7/12/2019 3:45 PM, Conrad PA5Y wrote:
It should be mentioned that FT8 and JT65 are constant envelope and therefore
there should not be any AF envelope to follow. Actually when I recently
measured the AF output from WSJT-X there was a tiny amount of AM, around 1.4%
in fact which so small as to be of no consequence.
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