YK,
IPD cannot improve the integrity of the actual RF link. That link is
the link between the rf module in the tx and the decoder in the rx. The TX
side is basiclly a normal PPM modulation. That is transferred to a standard
FM rf signal (same as PPM and PCM!). The only difference is the ability to
decode that signal on the other end (the Rx side). IPD shares the same
fault tolerance and bad data rejection that PCM does while adding the
variable frame tolerance and shorter data word (faster update rate).
The biggest advantage IPD has over PCM on the RF world is the ability to
vary it's tolerances to allow more data to get through while still
maintaining the servo limits. So when a slightly garbled piece of data gets
through (say channel 1-4 is fine but 5-8 is toast) then it will still
process some data (channels 1-4 in this example). PCm will reject the
entire string.
PCM is not dead. IPD is simply different. :)
Jason
----- Original Message -----
From: "YK Chan" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>;
<[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Wednesday, July 19, 2000 2:50 AM
Subject: Re: [RCSE] PCM is Superior
> It is less likely that IPD can improve RF link integrity, if I
> understand Jason's definition correctly. I define integrity as the
> link between the stick and the flight. Not just RF, interference, IPD,
> servo or mechanical. That means an effective IPD should meet Jason's
> requirement to some extend.
>
> YK Chan
> Seattle
>
> ----- Original Message -----
> From: <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
> Cc: <[EMAIL PROTECTED]>
> Sent: Tuesday, July 18, 2000 6:18 AM
> Subject: Re: [RCSE] PCM is Superior
>
>
> > In a message dated 7/17/00 10:22:39 PM Eastern Daylight Time,
> > [EMAIL PROTECTED] writes:
> >
> > << I learned more from Jason Werner's post regarding IPD than I have
> seen
> > or read elsewhere. As previously stated, if IPD increases the
> integrity
> > of the RF link between the TX and RX over what is currently
> available,
> > I'll use it.
> > See Ya, >>
> > I agree Simon, Jason's post explained it very well for me also.
> Bill
> > Grenoble
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>
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