Virgil Posted January 26, 2021 Share Posted January 26, 2021 (edited) Well I'm not having much luck with my sound ventures recently, or is it me? {:O) Having very successfully fitted a Soundtrax Econami decoder, adaptor board and sugar cube speaker into a Samhongsa CPR K1a 4-8-4 and with it running and sounding really good on DCC, I then tried enabling DC mode running on the decoder programming. Not at all straightforward as to enable CV12 must be set to 1 (fine, no problem) then CV29 has to be changed with the number being arrived at by totalling the bit weights which are determined by turning each one of 8 separate bits in CV29 on or off. I enabled Bit 1 (speed steps) which has a Bit weight of 2, Bit 2 APS (DC mode) which has a Bit weight of 4 and Bit 5 (EAM) which allows extended addressing . Bit 5 has a weight of 32, the three weights totalled = 32+4 +2= 38. However when testing on DC power (2 different controllers tried) sound is enabled OK but wheel revolutions are paused at each chuff which itself is only briefly played. Had anyone successfully enabled DC running with sound on on of these decoders please? Edited January 26, 2021 by Virgil To correct mistakes in numbering Link to post Share on other sites More sharing options...
Nigelcliffe Posted January 26, 2021 Share Posted January 26, 2021 Your maths for CV29 looks wrong to me : CV29=34 does not enable DC running. I wrote this page, years ago, to explain and calculate CV29 http://2mm.org.uk/articles/cv29 calculator.htm - Nigel Link to post Share on other sites More sharing options...
GoingUnderground Posted January 26, 2021 Share Posted January 26, 2021 No Bit has a weight of 30 in CV29. So it's more than your maths that's wrong. If you look at the Soundtraxx manual, or the NMRA standards, you'll see that the Bit weights are Bit 0 1 2 3 4 5 6 7 Weight 1 2 4 8 16 32 64 128 A value, or weight, of 34 turns on Bits 1 and 5 as 2 + 32 = 34, which will not enable DC running. Link to post Share on other sites More sharing options...
Virgil Posted January 26, 2021 Author Share Posted January 26, 2021 Hi Nigel, I looked at your link and tried the ticked suggested setting of 6 for CV29 with no joy, the resultant being no motion at all on DCC or DC though with background sound as before (air pump and generator). If bit 5 long loco address is included then a total of 38 for CV29 is indicated. This is actually the figure I had arrived at on rereading the Soundtraxx manual, I had not enabled the 28/128 Bit 1 speed step mode (Bit weight 2) totalling 38. With CV29 set to 38 the chuffs as before stop wheel movement for the normal duration of the chuff. Link to post Share on other sites More sharing options...
Virgil Posted January 26, 2021 Author Share Posted January 26, 2021 Indeed 32 is the Bit weight of Bit 5 so 32+4+2=38 Link to post Share on other sites More sharing options...
Nigelcliffe Posted January 26, 2021 Share Posted January 26, 2021 47 minutes ago, Virgil said: Hi Nigel, I looked at your link and tried the ticked suggested setting of 6 for CV29 with no joy, the resultant being no motion at all on DCC or DC though with background sound as before (air pump and generator). If bit 5 long loco address is included then a total of 38 for CV29 is indicated. This is actually the figure I had arrived at on rereading the Soundtraxx manual, I had not enabled the 28/128 Bit 1 speed step mode (Bit weight 2) totalling 38. With CV29 set to 38 the chuffs as before stop wheel movement for the normal duration of the chuff. CV29 = 6 would be the default in a new decoders. But that would be a short address (default of address 3, unless the user changed the short address). There are other CV's for which functions are active on DC: CV13, CV14, those may be relevant to what happens. No I don't own one of those decoders. My calculator is correct, and matches the NMRA standard, and the Soundtraxx manual extract quoted above. - Nigel Link to post Share on other sites More sharing options...
Virgil Posted January 26, 2021 Author Share Posted January 26, 2021 That's fine Nigel but Bit 5 has to be enabled at 32 weight in order for the loco to run on an extended address. This is the default setting for the Soundtraxx decoder as it is usual for most users to have several locos. Regards Doug PS I am looking at CVs 13 and 14 to see if they need tweaking. Link to post Share on other sites More sharing options...
Virgil Posted January 26, 2021 Author Share Posted January 26, 2021 I have been trying to upload a short video clip of the faulty running on DC sound with this loco but can't make the clip small enough to fit in the 10 MB limit on this forum. Can anyone assist with this please? Link to post Share on other sites More sharing options...
smokebox Posted January 26, 2021 Share Posted January 26, 2021 1 hour ago, Virgil said: I have been trying to upload a short video clip of the faulty running on DC sound with this loco but can't make the clip small enough to fit in the 10 MB limit on this forum. Can anyone assist with this please? Post the video on YouTube and then paste a link to it here. Link to post Share on other sites More sharing options...
Virgil Posted January 26, 2021 Author Share Posted January 26, 2021 Great, I’ll give it a go, thanks. Link to post Share on other sites More sharing options...
Virgil Posted January 26, 2021 Author Share Posted January 26, 2021 Please see the youtube link to see the problem. https://www.youtube.com/watch?v=5f-wvwjUBiQ&feature=youtu.be Link to post Share on other sites More sharing options...
Nigelcliffe Posted January 27, 2021 Share Posted January 27, 2021 You say "2 different DC controllers" but at no point say what they are, or whether you have a meter to measure their output. Those controllers may be relevant. - Nigel Link to post Share on other sites More sharing options...
Virgil Posted January 27, 2021 Author Share Posted January 27, 2021 (edited) Thanks for the reply and query. The first controller is an AGW PE143 transistor power unit, and the second is a Hammant and Morgan Duette, both working well and used for my DC locos with no problems and both giving exactly similar results when used with the Soundtraxx decoder. Edited January 27, 2021 by Virgil Link to post Share on other sites More sharing options...
Virgil Posted January 28, 2021 Author Share Posted January 28, 2021 For the record I have the following CV values set thus: CV12=1 CV29=38 CV13=0 CV14=3 CV241=0 CV242=0 Link to post Share on other sites More sharing options...
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