Sound not synchronising with motion

C

Clive

Drama - acting, Woodwork, G Scale, railways
Country flag
This is so strange but there is probably a simple solution to some of you . I have a LGB Heidi loco, DCC factory fitted. I installed a Massoth sound unit ( emotion S ) successfully and all was well.
There was a rattle recently inside the loco and I investigated. It was the smoke box floor. Refitted, not touching the sound unit.
The loco on exceedingly slow speeds sounds great but at running speed the sound is charging way ahead for the correct speed ie. at eg. Speed 6 it sounds as though she is running at 100 mph and about to expire.
Anyone know why please and what I can do to remedy this situation.
Many thanks
 
Unless there is a 'chuff switch' (colloquial name for a device to provide triggering information) then it is down to a couple, or three, CV's and is something of a compromise..
 
Greg Elmassian said:
DCC factory fitted, so did you remove the stock DCC and replace with the Emotion S, or did you just add the S?
Click to expand...
Heidi has factory-fitted DCC, but it does not include sound..
The Massoth S, is a sound-only (plus the odd function) decoder, and could be using the SUSI bus interface.

PhilP
 
PhilP is right. I just added the emotion S . Hi Phil
What is chuff switch and where would it be? I also have no notion of SUSI BUS interface. I could PM you - if you wouldn’t mind
 
Clive said:
PhilP is right. I just added the emotion S . Hi Phil
What is chuff switch and where would it be? I also have no notion of SUSI BUS interface. I could PM you - if you wouldn’t mind
Click to expand...
Hello again Clive.. :)

I am not sure if Heidi was fitted with a chuff-sensor? - Probably not, as she is the older model, I believe.. :wasntme:

Massoth do a kit (for either push-fit, or screw - fit axles /wheels :

AllAboutLGB: Massoth Decoder Accessories

We sell, service, and install Massoth Electronics Products. We carry Massoth's entire product line and we usually have nearly-all their products in-stock for immediate delivery.
www.allaboutlgb.com www.allaboutlgb.com

You have to remove an axle from the loco.
Switch the wheels to the replacement axle.
Glue the ring-magnet.
Slip the hall-effect sensor into the motor-block.
Feed the wire up, into the loco, and configure the 'S' to take triggering info from it..

Sounds scary, because you have to get the mystical 'quartering' correct, when you put the loco back together.. ;):D

Time for me to try to get to sleep, but I can pick up any PM's in the morning.

PhilP
 
I'm guessing since you installed the Massoth S sound to the original locomotive.
You may need to adjust some CVs to get the correct chuff rate.

The only way to get perfect sync is as others said, via a chuff sensor of sorts.
So that the detector can recognize the correct quartering.
 
The issues with most sound units is that the chuff rate is approximated by the speed. Normally you can get it sounding good at low speeds, but sounds like a machine gun at higher speeds.

Then people often tune the system for 2 chuffs per revolution versus the prototypical 4 chuffs per revolution. That normally sounds better at running rates, but clearly wrong at low speeds.

That's the normal compromise that people go through.

There are more sophisticated ways of doing this, but only a few decoders do a good job. (I use those decoders). (They cost more or are hard to get)

Greg
 
Clive said:
This is so strange but there is probably a simple solution to some of you . I have a LGB Heidi loco, DCC factory fitted. I installed a Massoth sound unit ( emotion S ) successfully and all was well.
There was a rattle recently inside the loco and I investigated. It was the smoke box floor. Refitted, not touching the sound unit.
The loco on exceedingly slow speeds sounds great but at running speed the sound is charging way ahead for the correct speed ie. at eg. Speed 6 it sounds as though she is running at 100 mph and about to expire.
Anyone know why please and what I can do to remedy this situation.
Many thanks
Click to expand...
Clive - You don't have to go to all that pain to install a Hall Sensor to get the chuffs in sync with the wheels. I agree, that certainly would provide very accurate chuff rate. However, just hook up your Massoth S to a DCC Programming Track and use CV 197 and 198 to adjust the chuff timing and rate. The Massoth S Sound-only DC/DCC Decoders only require connecting its two wires to the locomotive's track power.
 
Greg Elmassian said:
Tom, at what "speed" (which must be speed step" do the 2 CV's have effect, i.e. what/when/how fast is "high speed"?

Greg
Click to expand...
Greg, CV197 Steam Chuff Speed in Max Speed has a range of 0 (fast) to 20 (slow). If this CV is set to 1 - 3 range, the chuffs go super fast even at low speed steps. I usually set the Massoth decoders I install to 20 which gives a more hearty throat chuff sound. Then you set CV198 Clock Simulation Time Basis which has a range of 1 - 255. I usually set the decoders to around 35 - 45 range which would be 4 chuffs per wheel revolution. You have to test the settings to see what you want. If you set CV198 to around 65 - 75 range, you'll get 2 chuffs per wheel revolution. Again, testing various combinations of CV197 and CV198 for the overall sound and chuffs per wheel revolution you like.
 
You must log in or register to reply here.
Back
Top