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Battery Radio Control ... In My 44-Ton 'O'-Scale Locomotive
 Moderated by: W C Greene Page:  First Page Previous Page  1  2   
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 Posted: Sat Jul 16th, 2011 10:11 pm
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Toeffelholm
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Woodie,


The 'Kyosho' or 'Losi' combined ESC/receiver boards are an exceptional case in the car/boat/plane RC world.
Normally you have a receiver with connections as many as channels and where you plug in your ESC, servo or switching circuit.


I personally need the additional LiPo warner.
I'm just to talented to forget things.
So my scatty factor is just much higher than yours. :)


To the end of the year the 'Kyosho' boards you use, are also available in 2.4 GHz !! :bg:
then also the 2.4 GHz users are able to use this combined boards. :2t:


Juergen




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modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
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 Posted: Sat Jul 16th, 2011 11:31 pm
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Toeffelholm
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Sorry, I was wrong.


Team Losi 2.4GHz combined boards are available to the end of the year.

http://www.losi.com/Products/Features.aspx?ProdId=LOSB9524


They can be controlled with Spektrum transmitters.
So I'm able to try them.


The combined Kyosho boards are already available for 2.4 GHz

http://www.kyosho.com/eng/products/rc/detail.html?product_no_1=82003

But do only listen to Kyosho 2.4 GHz transmitter.


Juergen




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modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
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 Posted: Sun Jul 17th, 2011 12:22 am
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W C Greene
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Juergen-I have been really lucky with what I use, both Kyosho and Losi boards. The Kyosho boards can handle a 3 cell li po but the Losi boards will smoke on 11.1 volts. All my boards/transmitters are the old 27 MHZ AM but they work quite well. I would love to get into 2.4GHZ but the economics won't allow that now. My transmitters are old JR, Kyosho, Traxxas, and a couple of unknown jobs but all work with what I have. If I could afford one, I would try a Stanton system but money is very tight. I prefer the Kyosho boards since their size makes tight installations possible.
Woodie



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 Posted: Sun Jul 17th, 2011 02:19 am
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Nortonville Phil
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Ed,

Great to have you here and doing battery RC.

I converted my first engine a MTH O scale 2-8-0 this past winter.

It ran great.

But I have since removed the RC stuff from that loco and sold the loco to a friend

but kept the RC goodies for another project.




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 Posted: Sun Jul 17th, 2011 10:05 am
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Toeffelholm
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Woodie,


If your 27Mhz equipment works without appreciable disturbances, there's no need to change.

In my case - after having used different RC controls for my trains over the last 7 years - with 2.4 GHz RC I have absolute disturbance free connection for the first time.

For guys being new to this field like Ed,
it is good to invest in the newer technic, I think.


@Ed,

what PWM frequency does your ESCs have?
Do they give an audible noise?


Juergen




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modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
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 Posted: Mon Jul 18th, 2011 10:49 pm
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Ed Reutling
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Woodie


This my first experience in R/C.

I had no real outside help, other than Action.com in UK.


They had an ESC which would just fit in the hood of the loco, built before LiPo and had no low voltage cut off.

The receiver has a max of some 3.? volts maximum feed from the battery which I chose as 7.4 volts, because of size.

Therefore I needed a constant voltage device to reduce the 7.4 to 3.? volts to the receiver, there are all the components.


Not having your experience in the LiPo slow down and not knowing that if they are completely discharged,

one can never re-charge them I poofed some $40 + on my lack on knowledge.

Live and learn.


Now, I will ask you for a link to an ESC with LiPo low voltage and built in 3.? volt outlet for the receiver.

At that time I will only have ESC, receiver and battery.

No extraneous parts.


I would like it clean and simple but did the best I could for a first timer,

at least I think so.


Ed Reutling

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 Posted: Tue Jul 19th, 2011 01:56 am
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W C Greene
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Ed-I think you did just right. I was "exposed" to the tiny r/c car stuff when I went to work at a hobby shop that sold them. Previously, the train store where I worked considered my interest in r/c as "devil worship". I didn't know anything like what I have existed until I got to see it for real. Just go to a train shop and tell them that you are interested in r/c..they will be laughing as they throw you out! What I have is an old friend who is a r/c jet flyer, he has taught me quite a lot about radio and encouraged my interest when others thought I was crazy. That's why I always tell others to get a friend who flys, drives, or sails with r/c..they have the best advice.
Woodie



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 Posted: Sun Aug 7th, 2011 11:34 pm
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Ed Reutling
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Juergen you said :-

@Ed, what PWM frequency does your ESCs have?

Do they give an audible noise?


Sorry I missed it.


The only audible noise is the motor hums at low starting speed.

Something about the pulse frequency of the ECS, acording to the maker of the board.

It does not really bother me that much, but it is noticeable.



As a change of topic, a modeler had heard of what I have done and asked if he could come by and see what it is all about.

It appears that he is going to try it in one of his locos, a Weaver RS-3.

He was really awed [?] by what he saw !!


Ed Reutling

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 Posted: Mon Aug 8th, 2011 06:58 am
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Toeffelholm
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Hi Ed,


I think I haven't expressed myself clear enough.

Yes, it is the motor that is excited by the PWM frequency.

As you describe it, your ESC seems to have a low frequency like my ESCs from the 1:87 RC car division, that have about 50 Hz.
This, being a frequency in the lowest section of the human audible range.
I notice it as a silent deep toned hum, that doesn't bother me much.

But it goes worse when using an ESC with a frequency at e.g. 1kHz, what seems to be a rather common frequency on many ESCs.
This gives to my experiences an absolutely annoying whistling.

The sound disappears when using a ESC of really high frequency,
that means when it reaches the upper auditory threshold.
I have a very good ESC with 16 KHz that gives no sound at all.


Nowadays DCC decoders also have a very high PWM frequency.
The first DCC decoders I have used on my G-scale locos as they have been rather new to the market,
gave a sound that I thought I destroyed the loco.


Juergen




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modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
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 Posted: Tue Aug 9th, 2011 12:37 am
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W C Greene
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Wow-I guess in my "dumb luck", I have missed the high freq noise you mentioned. My old lokies run very nicely and quietly. Go figure...
Woodie



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