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DelTang 2.4GHz receivers - pt.I
 Moderated by: W C Greene Page:  First Page Previous Page  1  2  3  4  5  6  7  8  9  10  11  ...  Next Page Last Page  
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 Posted: Mon Oct 8th, 2012 10:15 am
   
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mwiz64
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Lead, follow or get out of the way, says I. Somebody is going to jump on this at some point. Maybe David should be approaching one of the heavy weights to see if they are interested. I bet Spektrum might be. They are a bit of a new comer in the radio business even though they hold the majority of the market here in the US. They have that majority because they were the first to bring spread spectrum technology to the R/C hobby industry. If I were David, I might be giving Horizon Hobby a call.

Mike

Herb Kephart wrote: MRC probably spent a bundle of money developing and selling the DCC idea, and wants to milk as much money out of that cow as they can.

Herb  



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 Posted: Mon Oct 8th, 2012 10:26 am
   
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DavidT
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Herb,
I've not measured Losi but I have measured several other receivers with embedded ESCs. It seems common for the PWM frequency to be around 1kHz. This has a bit of a whine. My receivers go up to 700Hz. I found a web site by a train enthusiast and electronics guru who listed many commercial mains controllers for trains and they used low frequencies around 100Hz. So I have 60 and 130Hz which are probably the best for trains, 300Hz just in case and 12hz which makes a 'pop pop' sound in my little boat.

The 60 and 130Hz settings make a 'gravel crunching' sound and I think the 300hz is fine too.

Capacitors can help reduce whiny ESCs. I got the impression from my tests that you need somewhere between 1uF and 100uF. This is easiest done with two tantalum or electrolytic caps. Since these are polarised you need two. The negatives of both need to be connected together and each positive goes to the motor terminals. Caps change the startup characteristics and the low frequncies I now have make a nicer sound so I've not pursued caps further.
dt.

Last edited on Mon Oct 8th, 2012 10:27 am by DavidT

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 Posted: Mon Oct 8th, 2012 10:59 am
   
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DavidT
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I believe HH own Losi and Atherne. Losi have a Spektrum version. So it would not surprise me if radio control trains were just around the bend. Spektrum have not struggled with being innovative up to now.

For people that don't know, the more advanced Spektrum transitters have model memories. Each of these have a unique ID and have to be bound to separately. It's called ModelMatch. All Spektrum and compatible receivers can only be bound to one model memory at a time. However, it's not difficult to make my receivers bind with two memories. I have this on a prototype.

If implemented for trains, each train could be bound to two Tx memories. One could be unique and used only for that train. It would be used for driving the train on its own and perhaps bringing it up to a consist arrangement. The other could be used for controlling the consist. In that case all the trains bound to the consist memory would work together when that memory is selected on the Tx. Only one transmitter memory can be active at one time so the trains will either obey their individual commands or act as a consist.

It does not make the receivers much more complex because each time you bind it just replaces the 'oldest' one. It then accepts signals from both so whenever you select either model memory it just works as normal. But I'd need to know if it has a use.
dt.

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 Posted: Mon Oct 8th, 2012 12:53 pm
   
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mwiz64
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HH does own those brands. They would be a natural to develop a product like this. I the meantime, I need to get a good receiver/ESC for a 5V system for my Bachmann On30 Porter. Which one of your systems do you recommend, David?

Mike



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 Posted: Mon Oct 8th, 2012 12:59 pm
   
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DavidT
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I'll PM you Mike.

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 Posted: Mon Oct 8th, 2012 11:45 pm
   
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35er
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Hi David

in response to your comments regarding diesel sound chips I suggest you take a look at http://www.35rctank.com and listen to their various diesel sounds.

they recently modified the Leopard chip for me to a Deutz single diesel, which sounds superb with a 25x12mm speaker.

I have also used their standard Leopard chip in a RC controlled / battery operated 1:35 scale "Ferry" together with their dual motor controller. again the sound quality is excellent using a 25mm round (quality) speaker.

Have fun & stay cool
Bernard

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 Posted: Tue Oct 9th, 2012 03:32 am
   
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DavidT
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Interesting stuff. Thanks. David.

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 Posted: Thu Oct 11th, 2012 04:36 am
   
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Rod Hutchinson
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Hi David,

Thank you for pointing me to the video. Is it possible to see a photo of the installation?
Otherwise a description of the install.



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 Posted: Thu Oct 11th, 2012 04:42 am
   
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DavidT
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Hi Rod. Posts 28 to 31 in this thread cover my N gauge in the video. OK?
David.

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 Posted: Thu Oct 11th, 2012 04:51 am
   
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Rod Hutchinson
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Hi David,
Found after I sent the post. This is all new to me.a Can you review my shopping list.

Receiver
Battery
Transmitter
Charger for battery?



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