A big Thanks and a one bit question

[Hutch]

A big thank you for having the only understandable DCC forum available for an almost senile old man.

The circumstances: After the demise of the Crest Revolution I've re-entered DCC. In order to utilise my MTS 1 starter set that was in the back of the closet with vintage fishing reels, (which had only the capability to set the short address) I purchased an SPROG JMRI to read and write bits.

What I did was install a brand new LGB 55021 decoder that was plug and play in a 20605 Schoema.

The one bit question: The problem is that on an analogue track the engine will run forward until slowed to a crawl, stopped, or reversed. It then sits and stubbornly refuses to move until it's put on a DCC track. It will work fine in DCC mode. When checked with the SPROG thing the value 4 in CV29 has turned off. If reset to on with the SPROG or a newly acquired (used) 55015 the original symptoms will repeat.

My other 2 DCC locos work fine in all currently set modes.

What's broken beside my wallet?

 

[PhilP]

CV 29 value '4' (decimal) in a 55021 decoder..
14 speed-steps, normal direction, analog and digital.

So that should be correct to work on an analogue system.
What are you using to power the track? - Some PWM supplies can confuddle older decoders..

 

[Hutch]

CV 29 value '4' (decimal) in a 55021 decoder..
14 speed-steps, normal direction, analog and digital.

So that should be correct to work on an analogue system.
What are you using to power the track? - Some PWM supplies can confuddle older decoders..

Delete

 

[Hutch]

CV 29 value '4' (decimal) in a 55021 decoder..
14 speed-steps, normal direction, analog and digital.

So that should be correct to work on an analogue system.
What are you using to power the track? - Some PWM supplies can confuddle older decoders..

An old Hartland supply for testing. Will swap supplies this afternoon. Am trying to run main line analogue or Revolution and switch yard DCC. But occasionally carry an engine to the other area.

 

[ntpntpntp]

Very unlikely that PWM pulses or such would actually cause a CV value to change, it requires a specific sequence of programming commands.

After setting CV29 with SPROG/JMRI, try reading it back and make sure it's definitely set.

 

[Hutch]

Very unlikely that PWM pulses or such would actually cause a CV value to change, it requires a specific sequence of programming commands.

After setting CV29 with SPROG/JMRI, try reading it back and make sure it's definitely set.

The power supply swap made no difference, unhappily. CV29 reads back properly when read back immediately. If the engine is let sit during lunch, CV29 loses it. Swapped the decoder and all is now well. I'm glad this wasn't a soldered installation.

Thank you all.