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RC Smoothness and Sound
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 Posted: Thu Mar 28th, 2013 02:51 am
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J.Brown
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Nathan
Oh, if I went with Wireless DCC a decoder with sound would be one of the main reasons! There’s no doubt that DCC has some great features. As for listening to Bach from the loco, I’ll have to admit that didn’t occur to me—I’d be listening to music from the stereo and the train through my hearing aids!
-Jim
;)

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 Posted: Thu Mar 28th, 2013 11:46 am
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Bernd
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Jim,

Not having seen them in person I can't tell. Being that they are produced in this age, I'd say thay are all plastic.

Bernd

Last edited on Thu Mar 28th, 2013 11:47 am by Bernd

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 Posted: Thu Mar 28th, 2013 04:07 pm
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dan3192
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Jim, this is the model I was talking about in Post #10:


The first battery powered r/c unit looked like this:




Pretty scary looking, but it demonstrated (to me) r/c for HO could be done. The receiver was a Spektrum AR500 that came with the transmitter. The reversing ESC was for a race car, but will no longer be used because of the braking feature, which causes the engine to stop after running in reverse after approx. 10 seconds.

My personal choice is to run with one transmitter and one loco. Any number of receivers/locos can be bound to one transmitter. This means when I run loco A, loco B is turned off, BUT, if you have say two identical engines, each with their own receiver, like an A-B arrangement, they will take the same transmitter commands and run together in unison.

Sound can be very annoying, especially if the volume is set too high, or the bell is always on, or if there is too much woo-wooing. I do like the basic chuff sounds of a steamer and the varying pitch sound from a diesel engine, but I keep the sound volumes very low when running my BLI Hudson or Atlas Trainmaster. Both have QSI sound systems. I run on DC and use a Quantum Engineer for cab/sound control. 

BTW, my next project is converting an Athearn Genesis 2-8-2 Mikado to battery power and r/c. Engine and tender have plastic shells, so reception should be OK. After that, I'll be putting together batteries and a receiver for a Hustler switcher.

Last year I gave a clinic on battery power and r/c for members of the Nutmeg Div./NMRA here in CT. In January I ran my engines on a couple of layouts at the Big E train show in W. Springfield. As a result, I got an invite to talk about my cab control system with the membership of the Mohegan Pequot Model Railroad Club, which I did this past Sunday. There seemed to be a lot of interest.

I also have invitations to do a clinic at the Northeast/New England Railroad Prototype Modelers Meet in Collinsville, CT on June 1 and the 400-member Hub Div./NMRA outside of Boston in October or November. I'd be pleased to exchange ideas with any fellow r/c enthusiasts planning to attend any of these events.

Dan      

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 Posted: Fri Mar 29th, 2013 04:56 am
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J.Brown
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Dan
Quite a progression in projects!
I wish we could get you out to the West Coast. I'd love to see that Athern Genesis 2-8-2 Mikado.
-Jim

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 Posted: Fri Mar 29th, 2013 02:21 pm
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Herb Kephart
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Dan

Great that you are spreading the word around!

Herb



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 Posted: Fri Mar 29th, 2013 06:43 pm
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J.Brown
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Dan
You mention that the electronics consist of a 12mm x 13mm Del Tang 3-6V combination Rx/ESC ($47.00). It is a 2.4 GHz (frequency) chip with DSM2 (modulation), and has an 800mA reversing ESC output for the drive motor. It is a perfect match for my Spektrum DX5e transmitter ($59.95).
My question is this: If you wanted to use the existing (brushed) motor in a typical HO locomotive would this control system work or would it only work with a brushless motor? Initially I would like simply to drop a Rx and battery into the loco and not mess with the electric motor.
Eventually, I imagine that there are advantages of a geared down brushless motor in terms of battery life and smoothness that I would want to explore but as a novice I’d like to get into R/C without getting into those complications yet. Is that possible?
-Jim

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 Posted: Fri Mar 29th, 2013 09:37 pm
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Toeffelholm
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Jim,

The DelTang esc's are for brushed motors.

You don't need to use a geared coreless motor. It improves running qualities but conventional drives are also possible without problems.

Only that with some drives -also with the PWM control- the minimum voltage of the motor does not allow a creeping start.

But there are also conventional drives, that can be run in absolute creeping mode.

Juergen

Last edited on Fri Mar 29th, 2013 09:39 pm by Toeffelholm



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 Posted: Fri Mar 29th, 2013 10:47 pm
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J.Brown
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Juergen
Thanks for the good news!
What is a “PWM control”? Also, what minimum voltage must a motor have to allow a creeping start and how can one determine the minimum voltage of the motor? Thanks for your patience!
-Jim

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 Posted: Sat Mar 30th, 2013 12:18 am
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bobquincy
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PWM (pulse width modulation) is a method of controlling the average voltage by varying the amount of time the power is on versus the time it is off.  Zero percent = zero volts, 100% = full voltage, anything in between is roughly equal to the percent X the system voltage.  Although the pulses are full voltage they are delivered rapidly enough, and the motor smooths them out enough, that the result appears as a smoothly varying voltage.

A benefit is that the rapid full voltage pulses help to overcome any friction in the drivetrain, giving smoother starts and improved low speed operation.

Different motors have different starting voltages, we can determine the starting voltage by using a variable power supply (or a PWM receiver) and a meter, reading the voltage at which the motor starts to run.



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 Posted: Sat Mar 30th, 2013 12:53 am
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J.Brown
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Bob
Many thanks.
-Jim

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