I'm sorry to see Dale go too but can understand and share his frustration - https://www.marklin-user.../m643918-time-to-move-on

I'm not a computer scientist/engineer but do know the difference between DC logic pulses, typically 0V = 0 and +5V = 1, and the DCC/MM/mfx frequency modulated AC signal. Seems, many have already forgotten or may not even be aware of the address zero DC voltage shift method of operating a single analog DC loco along with DCC locos. Maybe because most on this forum started with and are most familiar with Märklin analog AC locomotives. This was an option on some early DCC central stations. It worked by superimposing the AC DCC signal on a positive or negative DC voltage. The DC voltage offset was determined by the address zero direction and throttle setting. The analog DC loco responded to the DC voltage offset, the DCC locos to the AC DCC signal. This has pretty much been abandoned because most DC motors do not like having the digitally encoded AC signal put on their windings.

Before anyone says, "but my all my digital locos have DC motors" remember the AC digital signal powers the decoder not the loco. The decoder rectifies the AC and sends an appropriate average DC voltage (average because the decoder output is typically a pulse width modulated fixed DC voltage) to the loco motor (and lights, smoke unit, etc.) based on the digital signal encoded in the frequency modulated AC.

These will be my final comments on the subject.

Edited by moderator 01 February 2022 06:41:37(UTC)  | Reason: Not specified

I think most of your post should be somewhere else, and then I wouldn't mind to answer..................

Per.



Moved posts into this new thread created by H0 /BDNZ

Edited by moderator 01 February 2022 06:43:11(UTC)  | Reason: Not specified

It can be done; but causes other problems

The DC voltage part would be added to the DCC peak voltage; which by "high" DC voltage most likely would cause the DCC decoders to be destroyed

If the DC voltage is equal to or higher than the DCC peak voltage, the signal would look like a PWM signal,
and the DC motor would respond accordingly - and then nobody could call the signal AC...........

If done on MM-decoders, the decoder would see it as a brake signal if the DC voltage was high enough;
but most likely the decoders would be destroyed before that = permanent brake

Per.

Yes, I know, I only answered the part that I quoted, and it was purely theoretically about what would happen if you superimpose DC on the digital signal

It had nothing to do with the address 0 DCC feature

Per.