Re: [softrock40] XOR divide by two clock driver
> ...I am not sure that a DDS output is quite as symetrical, soThis is missed in most implementations. A low pass filter for the
> it might not work quite as well unless the DDS output is properly low
> pass filtered for the frequency of interest.
highest output frequency is constructed, so the signal becomes less pure
as the frequency of the DDS is lowered. After all, a low pass filter at
30 MHz won't suppress any components below that, so an LO for 80 meters
has plenty of opportunity for spectral junk.
I suspect 1/2 octave filters would work pretty well in a continuous
coverage application, otherwise bandpass filters for the band of
interest would probably work very well as long as the band if interest
is not too wide.