Michael,
I'll see what I can dig up.
But you are right, when you get "hit" you get hit. Not much you can do
about it other than hope the other guy turns off his radio <G>.
I think that the lockout is again the tolerance issue. In the computer
industry there is a similar standard for networks (can't remember the
standard name but it really does nto matter). Basiclly if the number of bad
packets exceeds the number of good ones, then the system stops responding to
both packets until the ratio goes below some set level. That level is
determined by time as well as the good to bad ratio.
PCM recievers work off the same principle.
But even so, the issue was not PCM vs anything. PCM works fine, and is
a very good choice for people, especially those who don't want to "see" that
glitch. PPM is fine also, and the newer IPD rxs are as well. Each has it's
plusses and minuses, and each will be touted forever as the "best" by
someone. But the key is that each has both positives AND negatives, and
that the user regardless of what the hype out there says has to determine
which one is for them.
I personally don't find that the advantages of the failsafe system for
PCM outweighs the cost, lack of compatibility with other brands, weight, and
disadvantage of having a slower frame rate. So yes, I am very interested in
another alternative. Plus I have lose several helis to the dreaded
"lockout" where as I have never lost one with a PPM rx in it no matter how
bad the glitches were. But that is my opinion and nothing more there.
Jason
----- Original Message -----
From: "Michael Neverdosky" <[EMAIL PROTECTED]>
To: "RCSE" <[EMAIL PROTECTED]>
Sent: Thursday, July 13, 2000 5:02 PM
Subject: Re: [RCSE] General sailplane radio: FM or PCM?
> Please let me know your source on this as this is completely at odds with
> everything credible I have ever seen on PCM.
> Even when the PCM is in failsafe, as soon as one good packet comes through
> the servos are sent the good data. There is no waiting, no 'lockout'.
>
> What looks like lockout is just a lack of good data getting through.
>
> See if you can find that helicopter magazine article, I would like
> to read it to see how they did their tests and what the results
> were.
>
> Another problem is that most pilots will have a hard time telling when
> they have control and when they don't, in the environment of strong
> interferance.
> This means that some pilots will think that they are getting some
effective
> control through the glitching on a PPM and also think that it takes longer
> to get control back on the PCM. The human observations are just not very
good
> for this sort of testing.
>
> I still say PCM lockout is a myth just as the same of the myth of being
able
> to save a bird through the glitching on PPM. If the interferance is bad
enough
> to 'lockout' the PCM, you will have NO control on the PPM system either.
>
> The problem is that it is very hard to do good simulation of the problem,
> making it very hard to prove one way or the other.
> The other problem is that legend, myth and advertizing hype are often
> substituted for facts, especially in RC.
>
> ALL RC radios have LOCKOUT, if the signal ain't getting through,
> THE SIGNAL AIN'T GETTING THROUGH!
>
> The question is, do you want the servos to be in a predictable position
> or do you want them jumping around all over the place, perhaps even
breaking
> themselves by driving past their mechanical limits?
>
> michael N6CHV AMA 77292
>
>
>
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