> As near as I can tell the noise is only present when the board with
> the AD is attached

Re-reading earlier posts (so apologies for asking about something
you'd already mentioned)

"It appears the noise is originating on the board. The AD specs call
for 1K max input impedance. A unity gain op amp will probably fix
the problem for my needs"

I'm not aware of an AD conversing creating noise. The impedance
of your pot is not markedly different from the recommended. Being
slightly higher you can use a longer sampling time to offset this and
still get good results

and

"RA3 (AD pin) runs all over the board to the various sockets and
devices. However, the onboard pot does not exhibit the jitter"

So this perhaps doesn't appear to be a problem with the remote
pot at all, rather that the signal path from the connector to the AD
pin is picking up noise. Maybe EMF from a crystal ?

If you substitute the board pot with the remote (or put the board
pot on long wires) does this make a difference ? How about a
pot with shortish wires into the connector ?

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