ORIGINAL: stek79
Guys,
no comments about my observations?
I think that test should be explained in detail, I feel it is very valuable.
ORIGINAL: stek79
ORIGINAL: KeithB
ozzieflyer,
Here's a link to an excellent post from the NSRCA mailing list. It's a detailed description of testing done by an RC Club on PPM vs. PCM. One of the best post I've seen on the subject: [link=http://lists.nsrca.org/mailman/htdig/nsrca-discussion/2006-September/044780.html]PCM vs. PPM tests[/link]
Keith Black
Keith,
thank you so much for pointing out this test! Wonderful results to read...
I would like to discuss them more in detail here, in particular about how the test has been performed (perhaps you have spoken with Wayne, or know some detail about the test).
The fact that seems not stated is whether the PCM vs PPM tests was performed with TX with the SAME FREQUENCY or not. I assume yes, since otherwise no problem could result, but actually this conclusion is very surprising:
"If the primary was PCM and the shoot down TX was in FM
mode it was almost a non existent problem. A very very rare blip of power
when the shoot down TX was closer to the model than the primary. And this
was only with the shoot down antenna extended more than about 1/3 to 1/2
way."
So the question I have is: is the test proving that a PCM system will not be disturbed by a PPM one with the SAME FREQ? Is this correct?
To me it seems a bit strong result, I din't thought that PCM rejection was so good.
It would be very good to hear the opinion of somebody who knows exactly how the test was performed, if that actually was the result. I send an email to Wayne, but unfortunately he dind't replied me yet.
Thanks again Keith!
For me, the above info on pcm versus PPM is good, and a well conducted test. But it doesn't do a lot for me, personally, as I wasn't shot down. In fact, I was the only guy flying at the time. I will say I got a bit cross when people say, it (PCM) doesn't stay in shut down. It does. PERIOD. I've experienced it, I've seen it in other people's CRASHED 'planes, and I've had many people tell me as well. I have also seen two lucky guy's who managed to fly through it and get control back. But I think the ratio is 2 saved and 11 crashed, plus my own two.
It does happen.
I also got a bit cross when simple things like batteries and switches are pointed to as the cause, when I clearly stated all was well. And in typical fashion "normal" fashion, plug it all in, as I explained a few (a lot) posts ago, and all worked. All the range tests worked.
But as sh says. Once bitten twice shy. For me twice bitten, so ....
But now I have been given "Another chance" with a replacement rx. I guess I'll try it, but I know for sure, in a crappy cheap arf it will never fail. Put it in a Patternship, and good 'ol Murphy will say hello.
MikeEast.
Maybe you can pick out the good learning bits and summarise. I'm don't seem to be able to see the good bits anymore.