Hi

I have signal modul 72441 and want to use it. [}:)]

I have locomotive's with 6090x and mfx type dekoder.
Will the signal module work nice with both type of dekoder's

Hi Alberto

Thank you for fast and a excellent answer with video [:p]

Yes I have also locomotive's with the SDS motor

Really strange to look at this video, it slows down, speeds up and then slow down to stop [}:)]

I think I open my window and through out the 72441
As I think then it is better to just let the loco's stop [B)]

Thank's again

I guess this behaviour is due to the transition section with half-wave rectified negative voltage without filter capacitor.

If I remember it right my mfx locos showed quite strange behavior when exposed to such half-wave rectified signals. The mfx decoder will probably not recognize the transition section voltage as a brake signal, but due to the decoder's extreme sensitivity to track voltage, it will brake anyway. Then, when it comes into the real brake section, it recognizes the brake signal. But now it is back to full voltage so the loco accelerates up to its original speed before the braking takes effect. A contributing factor is probably the strange speed regulation curve of the mfx locos, where the "brake delay" to some part is an actual delay before the speed change starts to take effect.

I took a decision long ago to not use the brake modules. I think I have no reason to regret that decision. The brake module has never been well integrated in the Märklin digital system. It doesn't work with older models and now not with newer ones either. It is simply not a good technical solution. The problem is that it is difficult to come up with something better that serves the purpose without adding a lot of complexity to the system.

Not correct: mfx decoders are not voltage dependant - the problem exists only with the compact C sine (Almagik is wrong, too: this is not a problem with the 1st C sine motor).

This problem should be fixed with the new SDS (haven't tested it yet).
Can be cured for compact C sine locos by replacing the motor driver PCB that is hooked between decoder and motor - this part is strongly voltage dependant!

I think you are right that the most severe voltage dependency is caused by the compact C-sine motor itself. However, I have observed a similar effect with other mfx models as well. Mainly those with non-C-sine can style motors but also my only DCM model with mfx shows much more voltage sensitivity than my DCM+6090x models. All decoder/motor combinations show some voltage sensitivity but for the DCM+6090x it is definitly below my annoyance threshold.

Hello, all;

This is a result of the voltage sensitivity experiment of each motor.
SDS is improved very much, but SDS has a problem with the brake module.