Greetings:

I have noticed band pass filters designed for SDR applications limited
to less than an octave in band width and others that that are just a bit less
than two octaves.

I imagine the reason for less than one octave bandwidth filters is to
avoid a possible receiver spurious response at the second harmonic frequency
when operating close to the bottom edge of the passband for the filter in use.
But since the second order harmonic from a square wave LO as used here would be
inherently low I wonder if the need to limit the bandwidth to less than an
octave has been found unnecessary?

Since the SoftRock v9 filter design leans towards the two octave
bandwidth design I wonder how well these receivers perform with regards to any
second harmonic spurious responses when operating near the bottom edge of the
filter passband?

Has anyone documented any spurious response measurements for the
SoftRock receivers?

Can anyone here point me to relevant information on the Internet?

Thanks in advance for any help!

73 & Enjoy,
Tom, VA7TA