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Morning Ladies and Gents ,

Let me just start by saying all of my moderate 3 rail experience so far has been with Lionel. That said, I just bought what appears to be a real nice MTH transformer controlled UP GP-38 off eBay. In the back of the owners manual I received with it there is a list of compatible transformers that can be used with it. All but a couple are older post war Lionel but my newer Lionel CW-80 isn't included in the list. I believe I saw or read where the (newer) Lionel transformers use a chopped sine wave  where my new MTH engine needs a transformer that produces a pure sine wave. Regardless, I do also have an MTH Z1000 transformer. Can I assume the Z1000 is compatible with my new GP-38? or are there other factors I have to consider?

I would very much appreciate any and all comments.

Randy

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There has been previous discussion about this, try a search:

https://ogrforum.com/t...356#2415514336585356

If you want to run some MTH then the Z1000 would be a good choice. The CW-80 is not garbage, lots of people use them, they just are not compatible with an MTH engine...

... The CW80 is probably fine if you're going to operate Lionel trains, but I do not recommend it for MTH locomotives. MTH doesn't recommend it either (they list about 25 compatible transformers in their owners manuals) ...

Last edited by Ace

How different is the CW80 from the ZW-C in this regard?  I use the ZW-C with my MTH trains and do not have a problem.  I thought it had a chopped sine-wave too?  Is the problem the chopped sine-wave or something else about the CW80?  I did have a CW80 at one time, and I got some weird results at times.  In the end, I just needed more power to run multiple trains.

George

The Z1000 black brick transformer puts out a pure sinewave of a fixed voltage.  The Z1000-controller chops this pure sinewave to create the variable voltages to drive your "transformer controlled" GP38.   Your engine does not need pure sinewaves to operate.

That said, there are slight variations in how controllers chop sinewaves leading to possible variations in engine behavior when driven by a CW-80 vs. a Z1000.  So you'll see workarounds such as adding a lighted load to the track to suppress sometimes erratic behaviors such as whistles and bells going off by themselves.

If you later choose to dabble in DCS command control whether the full-TIU system or the Remote Commander, the communications is more reliable when there is a pure vs. chopped sinewave.   In such a case you would then just use Z1000 brick's pure sinewave and put aside the Z1000 controller.  Or, as Eddie reports, if you only have a CW-80 you can turn it up to full (where there's less "chopping").

To answer as simply as possible, without all of the information, I would say that if the CW-80 will cause problems, so will a Z1000 with Z-controller.  If your engine actually needs a pure sine wave to run, use a transformer that provides a pure sine wave.  if it will run on a 'chopped' wave from one transformer, it should run on a 'chopped' wave from any other transformer.  On the technical end, the wave-form may be different between various brands, but the effects on the electronics are going to be practically the same.

JGL

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