JR S-PCM Versus Z-PCM Receivers
01-13-2002, 02:51 AM
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JR S-PCM Versus Z-PCM Receivers
I'm fixing to go PCM for the first time on a 1/4 scale. Can anyone tell me the difference in S-PCM and Z-PCM? Is it just a JR thing or widely used?
Jack
Jack
01-17-2002, 11:54 PM
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s-pcm vs z-pcm
The s-pcm is the most current from JR.
Depending on which transmitter you have the failsafe option are a little better with S-pcm too. Jr still sells the z-pcm stuff .the 910 is Z as is another 6 channel one . I use the 649 s-pcm in 5 different planes with great results I also have a 627x and a 910z Z-pcm recievers and they work great also.
Dave
Depending on which transmitter you have the failsafe option are a little better with S-pcm too. Jr still sells the z-pcm stuff .the 910 is Z as is another 6 channel one . I use the 649 s-pcm in 5 different planes with great results I also have a 627x and a 910z Z-pcm recievers and they work great also.
Dave
01-18-2002, 12:44 AM
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JR S-PCM Versus Z-PCM Receivers
Me thinks the difference is very simple...
Z = 512 bit data stream.
S = 1024 bit data stream.
Additional bits ( binary digits) provides a more refined data stream or code scheme which is harder to punch holes in.
In real time it is a more accurate method to interpret 1024 pieces of code as compared to 512 pieces of code. End result; more code for error checking provides less chance for interference.
Not sure if or how resolution would be a factor here?
Z = 512 bit data stream.
S = 1024 bit data stream.
Additional bits ( binary digits) provides a more refined data stream or code scheme which is harder to punch holes in.
In real time it is a more accurate method to interpret 1024 pieces of code as compared to 512 pieces of code. End result; more code for error checking provides less chance for interference.
Not sure if or how resolution would be a factor here?
01-18-2002, 06:12 AM
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JR S-PCM Versus Z-PCM Receivers
Ok, am thinking more clearly now, I resend my previous statement. Servo resolution was increased. The original 512 PCM data stream was improved with the 1024 bit data stream. 1024 bit/point systems offer a servo resolution on 60 degree rotation two times better than 512 bit/point systems. DUH...
01-18-2002, 02:59 PM
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Z vers S PCM?
I flyer at our field has a 1/4 scale Tiger Moth, the elevators are huge, he uses Z PCM and you can actually see the "steps" (lower resolution) in the elevator when it moves up and down, when I first saw it I asked why the elevator was sticking like that, he said that was normal and has always done that. With S PCM the movements would be smoother and more precise because there would be twice as many "steps". ---------BladeRunner.
