Re: Help building custom electrical

On 8/20/03 4:30 PM, in article
[EMAIL PROTECTED], "[EMAIL PROTECTED]"
<[EMAIL PROTECTED]> wrote:

> Hello,
> 
> I am designing and building a flying model and unfortunately have had very
> little experience with non-out-of-the-box electrical systems.
> 
> I tried to learn about how my reciever works (Futaba FP-R127DF FM dual
> conversion) by taking a voltage tester to the 3 contacts designated for the
> servos. I then manipulated the lever on the transmitter (Futaba Conquest
> FP-T4NBF) while keeping an eye out for voltage fluctuations on the tester.
> What I discovered was the voltage between the red and black leads held a
> constant 5.28 volts regardless of the signal being recieved. Voltage
> differences between the white lead was not noticeable.
> 
> How does the reciever send a signal to the servo if not by fluctuating
> voltage? More to the point, how can I "read" this signal?
> 
> 
The white lead is the control lead.  It is a pulse width modulated signal.
0.5 msec to 1.5 msec with a repetition rate of about 16 msec I recall.  You
will need an oscilloscope to 'read' the signal.  The pulse goes from 0 volts
to the positive battery supply level and then back to 0 volts until the next
pulse occurs

The black lead is ground and the red lead the battery + supply.  Why do you
need to read it?  Not sure what you mean by non-out-of-the-box systems.
Futaba is a "boxed" system.

Howard