[NSRCA-discussion] 2.4 Ghz

[Jay Marshall]

Yes, there is a type of PCM as you mentioned. Unfortunately when you need
the fastest response, for a snap roll, everything moves at once to its
maximum position.
 
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Bob Richards
Sent: Tuesday, December 19, 2006 9:43 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] 2.4 Ghz
 
Seems about 10 years ago that I heard of one radio manufacturer working on a
PCM system with a priority type update. IOW, there is not much reason to
provide a fast frame rate if no channels are changing. If a few channels are
changing position, then this information can be sent immediately in a single
frame, and there is no need to immediately send the channels that have not
changed.
 
Also, I was under the impression that PCM1024 was more in the order of 45ms.
I believe there are multiple frames sent to cover all 9 channels (similar to
the two fields per frame of an interlaced TV signal).
 
I still think about my old ACE Micropro radio. Simple FM pulse stream. You
could program it to put out only the number of channels actually needed, so
as to speed up the frame rate. Great for something like pylon racers, you
could have an update rate better than 12ms for a 4 channel configuration.
:-)
 
Bob R.


Ed Alt <ed_alt at hotmail.com> wrote:
I just browsed some FAQ's on Futaba's site and they had a response about
frame rate for PCMG3.  They state that it is 17.6mS.  I had seen someone's
scope trace for PCM 1024 and they had that at around 23 ms.  I guess they
have improved their PCM coding algorithm with the introduction of the 14Z
and 12Z?  
 
Ed
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