That was a fascinating topic Larry. Thanks for the information.
@SammoKarm
4 жыл бұрын
Brilliant advice, I think you have solved my jerky loco problems.
@TheDCCGuy
4 жыл бұрын
If that doesn’t work you may need to dig into the BEMF settings. I tried all kinds of edits and auto-calibrations with the LokSound 4 that came with the Oxford Rail loco but just couldn’t get the slow speed fixed even after I removed the filter cap and chokes. I honestly think it is the cheap coreless motor they used. A fellow on RMweb pulled one and checked and found it was commonly used in personal vibrators made in China! Fortunately the Soundtraxx ECO decoder was able to deal with it. Good luck with yours.
@BC-fy1wn
4 жыл бұрын
Refreshingly informative and concise information on a subject that is not easy to explain. Doc BC
@davidaarons2488
4 жыл бұрын
Thanks, my Bachman 0-6-0 porter in which I put a Digitrax sound decoder in. it lurches like that at low speed in forward but in reverse works ok. I'll have to check that out. Thanks again Larry. God Bless Ya Dave
@geraldjones2278
3 жыл бұрын
Thank you for a very clear explanation of back EMF. I have heard this discussed without an explanation of what it actually is but now I understand. Plus I have two brand new BLI SD-9s that run very poorly at low speeds and this may just be the problem.
@mandbhomestead
4 жыл бұрын
Excellent video Larry, very educational. Thanks for sharing. Ken
@davennysouthern8717
4 жыл бұрын
Thanks Larry cheers David and Jenny
@MoosesWorkshop
4 жыл бұрын
Thanks for the resistor info!
@geac9100
2 жыл бұрын
The DC motor police are on the way!
@JohnHill-qo3hb
4 жыл бұрын
Those "resistors" are chokes, if the "resistor" has a greenish body, it is a choke. Standard electronic industry part.
@TheDCCGuy
4 жыл бұрын
John-thanks for confirming that those are chokes too, as I had assumed. Bachmann uses a variety of approaches on these circuits and I have seen them use two caps on a board, two attached to the brush contacts, and the more common one across the brushes, but most often use the typical wound copper wire chokes. This is the first instance where I have seen these used for this purpose.
@MoosesWorkshop
4 жыл бұрын
Yup!
@allenbarnes7202
3 жыл бұрын
I took a Bachman f-9 locomotive made back in the late 80's apart to see what it would take to install dcc decoders, and I did not find any of these , I take it i could switch to dcc with out much trouble.
@TheDCCGuy
3 жыл бұрын
Not too surprising as most Bachman locos from that era did not hVe them AFAIK. Your main issue will be current draw on those older motors.
@SammoKarm
4 жыл бұрын
My Oxford rail N7 0 - 6 - 2 tank loco works fine until it is going DOWN a 1 in 52 gradient with wagons behind it, its actions are that it, (gradually slows down, goes to the speed it is set at quickly, runs smooth for about 2 seconds) then repeats these until it gets on the level again, where it runs very well again. Going UP the gradient doesn't cause any problems.
@TheDCCGuy
4 жыл бұрын
Going downhill with a load can be a challenge for BEMF. What type decoder are you using? Another problem can be slop in the mechanism, as some models have too much play in the gears. On older Athearn diesels I used to use thrust washers made by NWSL to take up this slack and a fellow recently told me he used them in a LifeLike GP30. If your mechanism is anything like my Oxford Rails 0-6-0 you might check the spiral gear on the motor shaft to see if it has excess for and aft motion. Then check the gear train down to the drivers to see if there is slop in there. I am convinced many of these type models are made for flat table top running and don’t really factor in slopes.
@SammoKarm
4 жыл бұрын
@@TheDCCGuy I'm using Limo MX 600 I've checked the mechanics and can't find anything untoward, so believe the problem to be the back emf. I will have to go through the settings and try disabling the back emf altogether. Then gradually increase its application.
@TheDCCGuy
4 жыл бұрын
Sounds like a good approach. Also check the manual to see if to has an auto calibration procedure, many now do.
@SammoKarm
4 жыл бұрын
I've yet to remove the chokes / capacitors, from the Oxford rail N7. I will let you know if it solves the gradient issue.
@TheDCCGuy
4 жыл бұрын
Be aware that they may have used SMD components on the plug board, that’s the way my 0-6-0 was done. Here is a link to the YouChoos DCC website where they show how they solved their Zimo issue with these. www.youchoos.co.uk/Index-Resource.php?L1=Guides&Item=OO-OxfordDeanGoods
@bradmillard1689
4 жыл бұрын
While it is true that you can remove the EMI filters but if your modified decoders start to cause interference with other licensed radio services be prepared to have an authority on you door step demanding you replace the filters or fine you for the interference.
@TheDCCGuy
4 жыл бұрын
Yes, and as we use Wifi and Blue tooth more and more around our layouts for computer access and throttles we may see the effects moe directly so it is important to be aware of the possible consequences. I can remember when we used to have radio problems due to baby monitors and even the local cab office.
@TheDCCGuy
4 жыл бұрын
To see if there really is a potential problem I did a quick and straightforward test. I cranked up the DCC system and placed one of the Bachman 0-6-0 locos, that I had removed the filter caps and chokes from, on the track. Then I opened the KZitem app on my iPad and started streaming a video while at the same time running the loco right next to the iPad-perfect reception with no disruption of the Wifi signal at all. I then got out my Bluetooth airpods and connected to the iPad. With the KZitem video running I listened to the audio on the airpods and ran the loco at various speeds as I moved the iPad alongside. Still no impact on the audio or video. Although this doesn’t indicate what might happen with a dozen locos all running at the same time it does seem to indicate that at least for the frequencies of my Wifi and Bluetooth there is no impact with the locomotive running just a couple of inches away. I also have read that digital TV signals are not impacted either. So my opinion is these are old regulations left over from a time when analog TV and radio were likely to be affected by the RF/EMI created by DC motors. However I have been at this for over 40 years and haven’t had a complaint yet.
@TrainzLuvr
4 жыл бұрын
The small size of the decoder and the low power/voltage that goes through it makes its ability to cause EMI totally insignificant. I don't have a decoder like this, but I'd setup a spectrum analyzer to see if there's really any significant emissions coming from it. If this was some kind of a spark gap arcing at 5,000-10,000V, maybe there could be some wide-band EMI, but even that would be dwarfed by the soup of radio waves that is around us at any time. Besides, most of the comms today are digital, having error correction and there's very little analog transmission in any band that might notice EMI.
@jimnelson1969
4 жыл бұрын
Larry, what decoder did you install in the 060?
@TheDCCGuy
4 жыл бұрын
Jim, I used a Soundtraxx Econami UK steam decoder. It has a recording of a GWR 2-6-2, probably 4555 and a whistle among other associated sounds. So I use it for my 2-6-2 and 0-6-0 models. The really good thing is I can get one on eBay for $65 with free shipping.
@pieseasmyseas
4 жыл бұрын
I remember being a kid and we would be watching tv and mom would fire up the blender the tv would go to shit and we would flip out
@TheDCCGuy
4 жыл бұрын
I was thinking the same thing as I made the video.
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