DCS & TMCC

Sure- DCS is a high frequency digital signal that follows in parallel on the power wires to the track. TMCC is a low frequency radio signal that is also using the track as part of the antenna system. Both signals can coexist.

Simply connect the 1 wire from your TMCC or Legacy base system to the outer rail or common of your track system or anywhere in the power system.

I'm finding that the DCS signal can get degraded by a TMCC loco on the same track.  I'm going to have to start putting chokes in some of the worst TMCC offenders.  If you can't get a dcs loco to respond check the signal strength.  TMCC locos have knocked mine down into the 3 and 4 range in certain cases.  Some work fine.

Simple test, do a signal strength test with just the DCS engine on the track, then without moving it, add the TMCC/Legacy engine next to it and do the test again.  If the signal is significantly weaker, add the choke to the TMCC/Legacy engine.

John, I'm curious, what type of choke would you recommend?

@Weener Dog posted:

John, I'm curious, what type of choke would you recommend?

Typically a 22uH choke, rated for the expected current. In a locomotive that is typically well under 5A on modern stuff.

Similar previous topic (searching for DCS choke)

https://ogrforum.com/topic/amp-rating-for-dcs-chokes

DCS inductor:

https://ogrforum.com/topic/wti...acy-engines-on-track

And a quote with a search link for suppliers of 4A chokes

@gunrunnerjohn posted:

It's not uncommon for some Legacy locomotives to impact the DCS signal.  The cure is a 22uh inductor in series with the power pickups.  Obviously, this requires opening up the engine, so it's not a solution that everyone can do on their own.

Here's a list of suitable inductors for use internally in a single Legacy locomotive.

Legacy Locomotive DCS Protection Inductors