Digitrax SoundFX SDN144A0 Manual - Halaman 4

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decoder will result.

6. Inspect the installation before testing the sounds and replacing the shell. In

particular ensure motor tabs make proper contact with the PCB slots and

do not short to the frames, and the power tabs connect to the castings.

7. Connect to active DCC track power from a compatible DCC system and

select the factory default address 03 to enable sounds for testing

8. Be sure F8 (mute) is OFF to allow sound output, and after track power is

applied and the engine "starts", press F1(bell) or F2 (whistle/horn) ON to

hear these associated sounds. When removing the shell, note that the speak-

er is a snug fit and do not pull on the speaker wires to remove the speaker

from the shell.

9. Customize sounds by programming Sound CV's to adjust the desired con-

figurations, as shown in the following tables of Sound FX CVs. CV60=0

sound scheme is a GP38 and CV60=1 is an Alco C420. Other locomotives

may be downloaded from the Digitrax web site and conveniently pro-

grammed using a PR3 programmer. This "A0" form-factor PCB may be

used in a number of other N scale locomotives by applying a little modeling

ingenuity.

Speaker Mounting and baffle or enclosures.

The sound performance of any attached speaker(s) is greatly affected by the

mounting system and required baffle or rear enclosure space. Depending on

the locomotive model and construction and speaker chosen it may be necessary

to modify the frame or parts of the internal shell to make room for one or more

speakers and enclosure.

For the Atlas N scale GP38 installation shown here the whole body acts as a

sound baffle once the shell is in position. To optionally increase the sound vol-

ume it is possible to drill out the two rear fan details as shown and replace

these with painted BLMA brass fan parts that permit the improved venting of

sound.

Obviously the space inside this N-scale locomotive is limited since the frame is

configured for maximum weight and pulling effort, and the installation shown

here is just one variation of the possible locations for a speaker.

The baffle is used to isolate the speaker diaphragm front sound waves from the

"out of phase" rear sound waves. This minimizes sound cancellation, particu-

larly at lower frequencies. For most efficient sound generation, the cubic space

of the baffle should be as large as practically possible, and the baffle walls

should be acoustically rigid so not to allow acoustic interference.

For example, you can wire in the SDN144A0 in a modern HO-scale locomo-

tive with a high-efficiency can style motor as long as the stall current is less

than 1 amp at the track voltage in use. In this case it is possible to change to a

larger speaker(s) that has a "high bass" or similar enhancement. For best oper-

Complete Train Control

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