The 7800 has some decimation error issues and can be off from the
standard by up to 0.1Hz A simple demo of this is to put main and sub RX
on the same signal on
the same antenna and listen in stereo for the slow phasing that goes on
between the 2 receivers, it's horrid and makes it a very poor diversity
receiver.
That's likely why Icom has yet refused to add auto Main/Sub tracking. OTOH,
one of the first tests I conducted was to sync the 7800's Main and Sub
receivers and sample the audio into an oscilloscope in X-Y mode to establish
a Lissajous pattern. Any phase shift is represented by a change in the
pattern from a straight line to a fuzzy line, then to what appears as a
fuzzy ball. I could leave the 7800 running for days and not notice any
phase shift unless I induced the phase shift (e.g., moving the sub Rx by 1
Hz, for example).
Paul, W9AC
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