can you please explain to me what reversed sensing in an ADF system is
As explained previously, 180 degree opposite indication.
Also what does the legend say on this "reversed sensing" flag on the Tristar RMI or is it the normal power failure flag?
Normal OFF flag.
What resolver is this, is it located in that box you mentioned earlier....?
Yes, on those aircraft so modified.
Can you explain the interface between the comparator and the ADF (that you mentioned) on the Tristar, what exactly does it monitor and how does it indicate a mis-compare, how many degrees of error must there be before you get a warning...?
No, I fly 'em, not maintain 'em
You will have to ask an avionics tech about this.
This is all quite elementary, I'm surprised ASFKAP is not informed...then again, due to...
Obviously its been decades since I've seen an L1011 ...
...that may well apply.