TTS decoder for Class 121

[JsionyRN]

Good Evening

Could anyone tell me if there is a TTS decoder that woulkd be suitable for a hornby class 121 driving motor brake (R 2510)

Regards 

Jsiony RN

[ColinB]

It is an 8 pin DCC ready loco according to Hattons website, so any 8 pin DCC decoder. The Hornby R8249 will be ok, but really you can pick anyone you want. It is a DCC Hornby product so I expect their decoder to work. I don't know how much space there is inside, so that might be a deciding factor but the Hornby one is small and cheap. I have the equivalent Dapol to which I fitted sound, so there was enough room in that one, I suspect the Hornby is the same.

[96RAF]

Colin he is looking for a TTS decoder and there are no kits for DMUs yet.

[ColinB]

Sorry misread it, I did wonder why he was asking. I bought a Zimo as I got the Dapol one really cheap and it runs so well. I suppose it does sound a bit like like a class 37, definitely not like a class 47, well anyway my one does, but then I am no expert.

[96RAF]

DMUs have twin lorry engines and gear changes and stuff. 37s have a proper tractor engine.

[ColinB]

@RAF96 thanks for that. With the Zimo and probably the LokSound you probably get all those noises, I know with mine you do, but I suspect if it were implemented in a TTS you would just get the basic engine noise as there isn't the memory. I know with my TTS class 47 and LokSound class 47 (the loco had it in it when I bought it), the overall effect is totally different between the two.  

[96RAF]

From the little knowledge I have I suspect to build the sound file you would have an idle, then a rising rev range to gear change point, a blip in the revs with a crunch of gears, then repeat the revs bit and gear change for as many gears as available.

 

I would also suspect the awkward bit would be arranging the correct sounds coming down the speed range, as I don’t know if a DMU changes down the gears or just slows and picks the correct gear to take up slack at that speed. In fact I don’t even know if they were auto, pre-selector or manual gearboxes. That’s a question for DMU buffs.

[ColinB]

I just tried my class 121, it sounds like a really rough diesel engine. It sort of beats. The Zimo doesn't do the gear changes, not that I could hear. It does sound a bit like a really rough class 37, but not once it gets going. it is nothing like it. It is completely different to a class 47.

[JsionyRN]

Thank you all very much sounds like I need to source one outside of the TTS range

regards jsiony RN

[96RAF]

Listening to the bubble car at our local station (Mid Norfolk Railway) it sounds just like an old motor bus driving off, except it has two engines, so like two buses driving off. Not harsh at all.

[ColinB]

I suppose I was comparing it to a modern diesel, but even against the class 47 and 37 it sounded rough. Nice sound though and I think it does make gear changes, it is a bit difficult to tell over the other noises it makes.