Are you sure it won't pass the DCS signal? I have 4 of them (4 loops) installed between the track and the TIU and the DCS signal on each loop works perfectly: 10/10. I installed them after past derailments killed a TIU. :-( Does anybody know for a fact that there is a choke or filter in the PSX-1AC design that should be killing the DCS signal?
I believe they will pass the DCS signal, but as I recall some folks here were having problems with the PSX-ACs between the TIU and track. I'm thinking some could have added chokes? Been quite a while and I don't remember the exact outcome of the folks having problems? My PSX-ACs are pretty old (9-10 years) and the discussions I recall were all some time ago as well.
As far as I know there are no filters or chokes on my older PSX-ACs. I have no knowledge of this, but it's possible the PSX-ACs could have been updated to correct for the DCS signal interference?