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Motivation for post: I use DCS exclusively.  I typically have used one TVS device per lockon (I use tubular track) on my TEMPORARY Christmas layouts.

I've read a few posts warning that having, as is usually mentioned, "too many TVS devices" can deteriorate the DCS signal.  I'm wondering how one determines this.

A few years ago using TVS devices was a hot topic here and discussed regularly.  All of the advice says the best place is internal to each engine.  I don't have the skills to do that so I started using a TVS device on each lockon. 

The number of lockons varies greatly each year based on the track plan that I use.  In 2022 it was basically just loops - my layout is 11' x 14' so the loops are kinda big.  I used one lockon on the back, front, and each side, each separated electrically from each other.

Because of recommended wiring strategies, when I have switches and 'X's in use, because the recommendations "force" me to break it into blocks, I use a lot more lockons, which means a lot more TVS devices.  One year I had 9 lockons on a set of trackage.

Is there a way to know what too many TVS devices is????

as always, thanks

walt

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I was hoping to be able to come up with some guesstimate that I could use.  Having just a temporary layout and given the order that I build it in, it would be to my advantage to have at least some idea of what to think.

I lay the all of the track in place and test it with a LIGHT old conventional steam engine, mostly to test for a short or a lack of continuity somewhere.  This means all lockons are in place.  I don't screw the track down until I prove there are no shorts or dead spots.

I guess I could run a heavier engine SLOWLY around the  trackage that uses DCS (some trackage stays conventional) after testing first with the lighter engine but before screwing it down. I guess I could limit the number of lockons with TVS devices and replace one TVS lockon with a non-TVS lockon at a time if don't get a high reading on the signal test.

I am aware of how to test the signal, but thanks for the reminder Vernon.

as always, thanks

walt

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