Size of decoder?

BrownMouse

New Member
Ok, here is a silly one. How big are decoders? I am planning to scratchbuild a 4-4-0 American, and would like to leave the option of fitting a DCC decoder at some future date open, but I have not been able to find out the answer to that rather basic question. Thanks,
Elnathan
 

UP SD40-2

Senior Member
Ok, here is a silly one. How big are decoders? I am planning to scratchbuild a 4-4-0 American, and would like to leave the option of fitting a DCC decoder at some future date open, but I have not been able to find out the answer to that rather basic question. Thanks,
Elnathan
BrownMouse:wav: , your question is NOT silly, but rather complex:119: . heres the problem, there is no "standard" decoder size, in fact the same brand, like MRC for example has at least 5 different decoder sizes:eeki: . Digitrax, and others ALSO have different sizes, it just depends on the decoder you want, what you want it to do, and what brand you want to buy:winki: . I'm sorry it doesn't seem like much help, but the cold hard fact is like i said, there IS NO standard size:winki: .

in a steamer, your best bet would be to put the decoder in the tender, then you should have enough room in there to put just about any decoder you choose:winki: .
:deano: -Deano
 

Jim Krause

Active Member
Are you talking HO, or ???. I think you may have to go tender mounting for your decoder if so. Most manufacturers of decoders list the physical size of their equipment.
 

myltlpny

Member
To expound upon UP SD40-2's response, you can also use a decoder meant for a smaller scale if space is at a premium. I had to resort to using an N-scale decoder on a particularly tight HO loco. It works fine. The loco isn't one likely to see any huge loads and so a 1 amp decoder was fine. In your case, a 4-4-0 isn't likely to haul a great number of cars and should be fine with a smaller decoder.
One way to test I've read about requires using an ammeter in series with the track and power pack. Hold the loco still and apply pressure until it stalls. That amperage is the required decoder size. I've never had to try it myself.
 

BrownMouse

New Member
Thank you all. The problem is that the motor is likely to be in the tender too (since the 1850's locos are so small), but I guess I can manage an N sized decoder if necessary. IIRC, the motor I am planning to mount draws .5 amp at stall, so I should be fine...

Elnathan
 

Fluesheet

Member
If the motor is in the tender, I'd wager you'd have room in the boiler for the decoder. Lenz, Digitrax, Zimo and NCE all make some remarkably small decoders. Once you know the size of your space, navigate over to one of the larger DCC-specialists like Tonys Trains, Loys Toys or the like and compare the physical dimensions of the various brands to see what will fit that space. Good Luck!
 

Triplex

Active Member
People have managed to squeeze decoders into Z scale hood units, so I don't think there'll be any HO boiler too small for a decoder.
 

60103

Pooh Bah
For a 4-4-0, you probably don't need many extra functions (mars lights, or even headlights) so a low-end decoder should do. and no mounting socket. But can someone take a ruler to a decoder and say how small or big they can be?
 

Jim Krause

Active Member
Go to Tony's Train Exchange website. Find "Decoder Comparison Matrix". Length, width and height are listed for most brands of decoder, along with other details. Lots of other info regarding DCC on the website also.
 
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