RE: [Autopilot] test protocol

[Coert S. L. <c.s...@ch...>]

Hi,

I do respect your motivation to setup such a system,
but I think I have to put you on the right tracks.
So, if you have some time :-) I like to give you some hints.

Though there are many roads leading to Rome,
I think in this matter we have to set (technical)limits.

- PPM RC Channel mixing with a external electrical signal.
DON'T DO THIS!
Your RC-control is your only backup to control/SAVE your model
if something goes wrong.
Besides this, if you make changes to the radio modulation,
hence your PPM signal, your radio link will exceed it's bandwidth spec's.
and will interfere with neighboring channels.
I think nobody wants to fly with you anymore!
A wrong channel is one of the most causes for model crashes.

So, leave your RC as original as possible.
To tap on the PPM signal at the RX or TX, use opto-couplers.
This way your RC system stays electrically isolated.
After this a digital mix is OK!
Use your own Microcontroller to interface between:
Opto-RC / SD / Servo's / Data-Link <> PC.

Hope you still follow :-)

Coert



-----Original Message-----
From: aut...@li...
[mailto:aut...@li...]On Behalf Of
Fernando Angulo
Sent: vrijdag 3 december 2004 00:04
To: aut...@li...
Subject: Re: [Autopilot] test protocol


yes, I want to insert a X hz. signal into a RC channel (or electronic
mix on ccpm heli systems)

and yes, I am using a regular RC Radio with a TX (JR) and RX using PPM


On Fri, 3 Dec 2004 00:00:24 +0100, Coert S. Langkemper
<c.s...@ch...> wrote:
> Hi Fernando,
>
> OK, as I said before, it difficult to know what you're aiming for in your
> final concept.
>
> - Do you want to insert a 50hz. signal into a RC channel?
> - Are you using a regular RC Radio with a TX and RX using PPM or PCM
> channels?
>
> Coert
>
> -----Original Message-----
> From: aut...@li...
> [mailto:aut...@li...]On Behalf Of
> Fernando Angulo
> Sent: donderdag 2 december 2004 23:41
> To: aut...@li...
> Subject: Re: [Autopilot] test protocol
>
> No, I mean to insert on the desired channel a 50 Hertz sinoidal signal
> in order to measure the response of the system at this frecuency.
>
> this test is made for a wide variety of frecuencies and with all the
> results you can get a time-frecuency model of the helicopter.
>
> on a easy way, I´m trying to obtain a mathematic model of the
> helicopter in order to know wich is going to be the response of the
> heli to a determinated control order. To the several parameters the
> model has, I need to do a lot of determinated flight tests to hte
> heli.
>
> it´s just a scientific method.
>
> hope I've explained better this time. regards.
>
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--
Atentamente,  Fernando Luis Angulo Rodrigo

(fer...@gm...)


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