macman44 Posted December 20, 2018 Share Posted December 20, 2018 Are the R8249 and X9659 (aka '4-pin decoder') decoders functionally identical apart from the wiring harness? Looking at the illustrations on Hornby's website they appear different. If they aren't the same, what are the principal differences? I can't find any technical information about the X9659 on the website, and in particular it doesn't state that it is NMRA compliant, which the R8249 does. How would we expect the X9659 to behave on an NMRA-based DCC system such as Digitrax? Thanks,Paul. Link to comment Share on other sites More sharing options...
Rog RJ Posted December 20, 2018 Share Posted December 20, 2018 I've always assumed them to be the same as they seem to use all the same CVs and they perform the same on my layout using either an Elite or my NCE Powercab. Obviously, no lighting outputs available and they may have been disabled within the decoder, but I don't think they have. Link to comment Share on other sites More sharing options...
96RAF Posted December 20, 2018 Share Posted December 20, 2018 R8249 can have a 4, 7 or 8 pin plug.It has the R9659 designation if fitted with a 4 pin plug.The 7 pin version was for Pendolino only. X9719 is the designation for,this one from memory.The main difference between them is the 4 pin decoder does not support any functions as it doesn’t have the wires connected to the pcb.Rob Link to comment Share on other sites More sharing options...
macman44 Posted December 20, 2018 Author Share Posted December 20, 2018 Thanks for that reassurance, everyone. Although I have an X9659, I will use the technical info I have for the R8249. I don't need the additional functions. I have had some trouble getting it to run well, but it's OK now. On a related note, has anybody tried to shoehorn one of these decoders AND some form of stay-alive into a J52 0-6-0 tank engine? Since this engine's centre driving wheels don't contact the track (design intent, apparently) they don't pick up power, and this engine stalls on certain trackwork that has plastic bits (frogs, etc) at inconvenient spacing - e.g. Peco code 100 long crossing. If so, what stay-alive was used, how much dead time was covered, and how was it all arranged in the small space available? Thanks,Paul. Link to comment Share on other sites More sharing options...
Bugler999 Posted December 21, 2018 Share Posted December 21, 2018 I have been led to believe that if the additional wires are attached onto the pads all the functions available will work. Link to comment Share on other sites More sharing options...
96RAF Posted December 21, 2018 Share Posted December 21, 2018 No reason why not B999 unless the functions have been disabled in the decoder firmware. Proof of the pudding as they say is in the soldering.Rob Link to comment Share on other sites More sharing options...
Fishmanoz Posted December 21, 2018 Share Posted December 21, 2018 I sure hope I don’t find any lumps of tin and lead in my pudding this year! Link to comment Share on other sites More sharing options...
2e0dtoeric Posted December 21, 2018 Share Posted December 21, 2018 The lumps of lead to watch out for are the ones traveling at high speed, in front of a noise that goes BANG! 😛 Link to comment Share on other sites More sharing options...
BR63 Posted December 22, 2018 Share Posted December 22, 2018 Oh! Do you mean a bullet train?? Link to comment Share on other sites More sharing options...
Fishmanoz Posted December 22, 2018 Share Posted December 22, 2018 I think I’ll stick with thruppences and sixpences and trust the pudding is not a Goon batter pudding mark II, the type that goes bang. Link to comment Share on other sites More sharing options...
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