  The dominant contributions from a discrete gravitational interaction produce
the standard potential as an effective continuous field. The sub-dominant
contributions are, in a first approximation, linear on $n$, the accumulated
number of (discrete) interaction events along the test-body trajectory. For a
nearly radial trajectory $n$ is proportional to the transversed distance and
its effects may have been observed as the Pioneer anomalous constant radial
acceleration, which cannot be observed on the nearly circular planetary orbits.
Here we give calculation details of the alternative II, discussed in
gr-qc/0106046.
