garrytheskate Posted August 27, 2020 Share Posted August 27, 2020 I have run the Hornby class 50 on dc for many years, later on converted it to DCC. No Problem. I have recently fitted a Hornby sound decoder. Using a Bachmann controller, the loco set for 14 speed steps. When the speed is set at 1/14 the loco judders, the distance varies from 10 to 25mm. Increasing the speed to 2/14 the control is perfect from then on up to 14/14. Any ideas please. Thanks Link to post Share on other sites More sharing options...
smokebox Posted August 27, 2020 Share Posted August 27, 2020 Tts decoders need to use 128 step mode. Link to post Share on other sites More sharing options...
cravensdmufan Posted August 27, 2020 Share Posted August 27, 2020 Agree, using 128 speed steps is far better. Also changing CV150 to 1 (default is 0) usually cures juddering. 1 Link to post Share on other sites More sharing options...
reggie Posted August 28, 2020 Share Posted August 28, 2020 12 hours ago, cravensdmufan said: Agree, using 128 speed steps is far better. Also changing CV150 to 1 (default is 0) usually cures juddering. Yes - had the same problem with mine even in 128 speed steps you need to change CV150. 1 Link to post Share on other sites More sharing options...
fezza Posted September 3, 2020 Share Posted September 3, 2020 A work around is to bypass the speed steps that cause juddering. For my tts 50 (on 128) the problem steps were 1-3 and 7-9. With this method it still started slowly on 4 and accelerated smoothly from 6 to a slow crawl at 10. I have had problems with my two TTS decoders. Sometimes the CV150 won't change for some reason on these chips. I wouldn't recommend them. I've had no problems with Bachmann or specialist DCC sound suppliers. Link to post Share on other sites More sharing options...
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