The filter can be easier but the IQ/phasing a large part of the work is at audio.
Doing it with high speed switch ICs can simplify it or even DBMs for the RF work.
A pair of DBMs and a twisted wire hybrid is a very low parts count path.
I've done it multiple ways and one item to note most IQ phasing rigs using
at least a 2nd order allpass (audio phase shifter) will sound better than a
filter rig. That allpass takes a few dual Opamps to make it go. RF filters
especially some of the lower frequency ones have significant delays
that are not uniform in the pass band. That adds audible distortion.
I've done a bit of work with them and have what I call a hybrid radio using
superhet front end at 6M and phasing hardware (miniR2/T2) as the IF.
The trick is that it was for 6M and phasing hardware works as well for
an IF at 36mhz as it would at 1.8mhz and that made the VFO simple
(14mhz).
That said the QRPlabs phasing RX as an IF has two features, one being you
can pick the frequency to suit yourself in a range from a few mhz up to
30-40mhz it performs just as well.
Allison
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