--- In [email protected], Larry W8ER <[EMAIL PROTECTED]> wrote:
> However I built 3 of these receivers and > experienced mirroring with all three. That is, with a LO of 3870, a > strong LSB signal on 3860 khz would appear as a strong USB signal on > 3880 khz but I do not think this is the fault of the oscillator. > > -- Larry W8ER > > I experience the same sometimes, but it proved to be the soundcard and the sampling. It needed calibration (skew, phase, sample delay etc.). On the DDS34 spurious, they do exist, but most of them come from the PC via the USB galvanic connection. When I unplug it, almost all are gone. 73 Christos SV1EIA
