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Cessna RC Engine Sound System

Old 04-30-2013, 06:02 PM
  #1  
engines4u39
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Default Cessna RC Engine Sound System

Hi, Can anyone help me solve this problem?
I have fitted a Rc engine sound system to my Cessna 55" span plane.
I am using a KEMO 40w Amplifier and a 40w Speaker with a SPECTRUM DX5e transmitter and receiver.
The problem is that the engine sound to the speaker only cuts in when the throttle is at approx 50% open.
How can I get the sound to respond immediately I move the throttle which is the sound of the engine turning over slowly.
I have tried re-binding without success.
Any suggestions would be greatly appreciated.
AP
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Old 04-30-2013, 06:17 PM
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xmech2k
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Hi. Well, you've left off a critical piece of information: what sound system is it? I haven't tried any of those, but my first guess would be it has a different sensitivity to throttle input than your ESC. Did you check the documentation of the sound system or contact the manufacturer?
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Old 04-30-2013, 07:26 PM
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fhhuber
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Plug sound system to a separate channel and mix to throttle. Adjust the mix to get the sound to respond appropriately.

It is going to be something to do with the programming of the sound system... but without knowing how to program that... this will work.

Admittedly, its a work-around.
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Old 04-30-2013, 07:44 PM
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pizzano
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engines4u.......

I have a little experience with the Shock Wave systems, a buddy has one like this:

http://www.modelsoundsinc.com/docs/S...StartGuide.pdf

Since performing sound tech and cable jockey duties for a couple local churches in town (to include RC buddies), I get a few requests to help out with issues like this...most of the time the problems stem from 3 issues:

Lack of proper power supply and impedance matching
Incorrect hook-up combinations
A short somewhere in the system (they are fragile) and vibrations will cause a few headaches

Would be good to know which system you have, but most have common wiring combinations.
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Old 04-30-2013, 08:05 PM
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fhhuber
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I think we are understanding the issue of the OP differently...

I think he has good sound, but improper relationship to throttle stick.

Your post relates to not getting good sound.

Maybe he just has one... maybe he has both issues?
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Old 04-30-2013, 08:54 PM
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xmech2k
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Originally Posted by fhhuber View Post
Plug sound system to a separate channel and mix to throttle.
Great idea, but he says he has a Dx5e...
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Old 04-30-2013, 09:41 PM
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engines4u39
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Hi, many thanks for your reply, I am sure your suggestion of mixing the throttle with the sound system is the answer. The engine sound and volume are very good it is just a matter of synchronising them together. I will give it a try and keep you informed.
Many thanks
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Old 04-30-2013, 10:00 PM
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engines4u39
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Hi, Thanks for your reply, the sound module is a TPV Electronics, I had no instructions with it other than a diagram showing the RC signal input and amplifier and power connections. The sound is very good when it cuts in at about half throttle, maybe I didn't read the description properly, but have since found out that it does mention mixing the channels. will let you know how it goes.
Thanks again for your time.
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Old 04-30-2013, 10:53 PM
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fhhuber
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DX5e... sorry that I didn't notice. Computer radios are so common that I just passed that up.

There are little devices you can get to put between RX and "servo" (ESC or sound board too) to adjust the relationship of 2 things on one channel.

http://www.horizonhobby.com/products...system-JRPA900
(There are others... I have a pair from Hobby King)

Y the throttle direct, bypassing the device if trying a lower cost one. This will help prevent issues with the throttle channel if the device fails. The Hobby King ones have appx 20% DOA rate.
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Old 05-02-2013, 01:49 PM
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engines4u39
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Default Cessna engine sound module

Hi, Thanks for your reply about mixing channels.
If I use a Spectrum DX6i instead of my DX5i would I be able to mix the throttle and sound system to respond together.
Many thanks
AP
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Old 05-02-2013, 02:04 PM
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Yes, DX6i has mixing that should get acceptable results.
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Old 05-02-2013, 04:19 PM
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engines4u39
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Hi fhhuber, many thanks again for your help I am sure that your suggestion is the way way forward, it seems more logical with my problem.
Many thanks again.
Alan
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Old 05-15-2013, 11:22 AM
  #13  
engines4u39
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Originally Posted by fhhuber View Post
Yes, DX6i has mixing that should get acceptable results.
Hi, I now have a DX6i for my Cessna, can you please explain in laymans terms how I Mix the Throttle with the Sound System?
At the moment I have the Sound module plugged into the AUX and the Throttle to the ESC.
I have a good sound when I adjust the actual sound module but I still can't get the sound and throttle to synchronise, the manual is rather short of detailed information on mixing the two channels.
Sorry to bother you again, but your input would be appreciated.
Alan Pace
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Old 05-15-2013, 03:32 PM
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fhhuber
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Find the user programmable mixes.. select one of the mix slots.

Select throttle as the first channel in the mix, Aux (channel 6) as the second

Initially set the ratio to 100% at both ends.

Not sure if the DX6i has multi-point mixing available. If so you will probably want it.

Experiment (with prop off) with the throttle stick and adjust the endpoint values (to reverse the mix start at -100% each end) to get the relationship desired at high and to get the sound to come on when you want. Then adjust the multi-point curve if available.
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Old 05-15-2013, 04:46 PM
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engines4u39
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Many thanks for your advice, I will give it a try and let you know.
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Old 05-15-2013, 09:49 PM
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Originally Posted by engines4u39 View Post
Many thanks for your advice, I will give it a try and let you know.
If you really want to get more control on syncro you can also try to setup the model as a Heli with Normal swash.You can then use the Pitch Curve to sync the sound.You also wont eat up one of the 2 precious mixes.
Using Pitch Curve you also have a multipoint/curve mix and arent locked into a Linear Mix.
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