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  • #16
    Originally posted by trvo View Post
    Could be interesting, non-dx7 tx's don't hold the resolution during the full stick movement, I have no idea if the dx7 does or not...

    Trev

    I think the DX7 stuff caters for this,not 100% sure but if it does then maybe part of what the Cyclock offers is not needed when using Spektrum,i wonder if the module based systems are the same??

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    • #17
      We'll see, I also like the fact that I can limit travel on the cyclock in a circular movement rather than the standard tx square shape, I currently have a cyclic disk in my tx but I may actually be able to take it out and shut Jim up about needing the full square area for planks...

      Trev
      Sent from my PC using Windows 7

      - CSM
      - Midland Helicopters

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      • #18
        I don't remember speaking?

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        • #19
          Different Jim
          Sent from my PC using Windows 7

          - CSM
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          • #20
            I Tried to post this before the interrupted forum service.



            That is a good question R50L, I was under the impression that the latency was introduced before the RF modulation and it was the way the signal was prepared to be broadcasted (i.e. processor)

            I believe that the Spektrum modules will work from a PPM signal and convert it into 2.4GHz which would mean you would lose,

            Model Match
            Servo Sync
            Reduced Latency

            I have notice on the advertising bumph they do not mention the above issue which is why I am only presuming at this stage, I think will try and get clarification on this.
            Raptor 50 V3 Titan
            OS 50 hyper-MP2 pipe-9252-401 & 9254-Rev Max-Radix600-Radix 95- Kasama Head

            Trex 600N Pro R.I.P
            OS 50 Hyper-MP5-9451-611 & 9256-RevLock 20-CycLock-Radix600-Align Tail Blades

            Knight 3D
            OS 50 Hyper-MP5 Pipe-9255-Logictech 6100-Rev Lock 20-Radix600-Radix 95

            Trex SEV2
            4S TP 2000-Medusa 28-40-3400 Jazz 40-6-18-GY401 & 9650-HS65MG

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            • #21
              Originally posted by jimbob View Post
              I don't remember speaking?

              Well we would have a hard time to shut you up
              Raptor 50 V3 Titan
              OS 50 hyper-MP2 pipe-9252-401 & 9254-Rev Max-Radix600-Radix 95- Kasama Head

              Trex 600N Pro R.I.P
              OS 50 Hyper-MP5-9451-611 & 9256-RevLock 20-CycLock-Radix600-Align Tail Blades

              Knight 3D
              OS 50 Hyper-MP5 Pipe-9255-Logictech 6100-Rev Lock 20-Radix600-Radix 95

              Trex SEV2
              4S TP 2000-Medusa 28-40-3400 Jazz 40-6-18-GY401 & 9650-HS65MG

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              • #22
                Just found this on Spektrums site, it does not mention servo sync though it says it is feeding from the PPM stream so I would expect servo lag.

                Will Model Match work with the Module System?


                No. Model Match is a patented feature that prevents a model from being operated using the wrong model memory. Model Match can only be integrated into a dedicated Spektrum transmitter such as the Spektrum DX7. The programming necessary to make Model Match functional must be embedded into the transmitter´s programming.


                I hear a lot about latency and response time. Supposedly the DX7 is faster than any 72MHz systems. Is the Module System as fast as the DX7?
                The DX7 is a purpose-built 2.4GHz spread spectrum radio. With the DX7, the stick inputs are directly converted to digital code bypassing the PPM stream. This is the primary reason the DX7 is so fast and responsive. The module system needs to utilize the transmitter´s PPM stream and converts it to the appropriate digital code. Because of this extra processing step, the module system cannot be as fast as a dedicated system. It´s important to remember that the PPM stream is actually faster than PCM. In reality, the latency and response time of the Spektrum Module System is virtually identical to PCM systems.
                Last edited by Nutz; 03-04-2007, 02:50 PM.
                Raptor 50 V3 Titan
                OS 50 hyper-MP2 pipe-9252-401 & 9254-Rev Max-Radix600-Radix 95- Kasama Head

                Trex 600N Pro R.I.P
                OS 50 Hyper-MP5-9451-611 & 9256-RevLock 20-CycLock-Radix600-Align Tail Blades

                Knight 3D
                OS 50 Hyper-MP5 Pipe-9255-Logictech 6100-Rev Lock 20-Radix600-Radix 95

                Trex SEV2
                4S TP 2000-Medusa 28-40-3400 Jazz 40-6-18-GY401 & 9650-HS65MG

                Comment


                • #23
                  Latency is produced before transmission, and the stick to xmission signal in the DX7 is slow, but the xmission from tx to rx is fast thus making it seem faster than normal.

                  In the 14mz it is the opposite, stick to xmission is fast, and as with all 35mhz systems, the tx to rx xmission is slow.

                  The new modules work in PPM mode as you suggest, but that means that the internals of the transmitter will be working at a very low resolution. I can see it being faster than normal 35mhz for transmission but you would loose out on the resolution, meaning accuracy problems.

                  Trev
                  Sent from my PC using Windows 7

                  - CSM
                  - Midland Helicopters

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                  • #24
                    Anyone know what the resultion of the DX7 is compared to a 35Mhz FF9 on PPM or PCM?
                    Raptor 50 V3 Titan
                    OS 50 hyper-MP2 pipe-9252-401 & 9254-Rev Max-Radix600-Radix 95- Kasama Head

                    Trex 600N Pro R.I.P
                    OS 50 Hyper-MP5-9451-611 & 9256-RevLock 20-CycLock-Radix600-Align Tail Blades

                    Knight 3D
                    OS 50 Hyper-MP5 Pipe-9255-Logictech 6100-Rev Lock 20-Radix600-Radix 95

                    Trex SEV2
                    4S TP 2000-Medusa 28-40-3400 Jazz 40-6-18-GY401 & 9650-HS65MG

                    Comment


                    • #25
                      I think that the DX7 would be faster since it is bypassing a lot of the slow internals that a normal ppm / pcm radio would use...but that's a guess...

                      I have a FF9 if anyone knows how to get this data from it? Very much doubt home equipment is up to the job...

                      Trev
                      Sent from my PC using Windows 7

                      - CSM
                      - Midland Helicopters

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                      • #26
                        http://www.rcheliaddict.co.uk/attach...2&d=1174658951

                        Here ya go...

                        Trev
                        Sent from my PC using Windows 7

                        - CSM
                        - Midland Helicopters

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                        • #27
                          I have seen that chart, did you see the artical that moyesboy (sorry if I spelt the name wrong) posted regarding latency on PPM & PCM???

                          See if I can find it.


                          found it
                          http://graphics.tudelft.nl/~wouter/p.../pasman03i.pdf
                          Last edited by Nutz; 03-04-2007, 03:16 PM.
                          Raptor 50 V3 Titan
                          OS 50 hyper-MP2 pipe-9252-401 & 9254-Rev Max-Radix600-Radix 95- Kasama Head

                          Trex 600N Pro R.I.P
                          OS 50 Hyper-MP5-9451-611 & 9256-RevLock 20-CycLock-Radix600-Align Tail Blades

                          Knight 3D
                          OS 50 Hyper-MP5 Pipe-9255-Logictech 6100-Rev Lock 20-Radix600-Radix 95

                          Trex SEV2
                          4S TP 2000-Medusa 28-40-3400 Jazz 40-6-18-GY401 & 9650-HS65MG

                          Comment


                          • #28
                            Very interesting, will have to digest it fully when I have some time.

                            I'll just have to limit my investigations to 'how it feels' since I don't have that sort of equipment lying around at home

                            Trev
                            Sent from my PC using Windows 7

                            - CSM
                            - Midland Helicopters

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                            • #29
                              also rember that some of the latency you get is from the transmitter doing some maths before broadcasting the signal out and i cant rember the figures but the cyclock is quicker at the proccessing due to having two procceesors (or something like that)

                              also for resolution a standard jr box has say 300 points 100 each way for standard travel and 50 each way for ATV's so by having your travels set to 100 each way you are loosing 1/3 of the acuracy (i hope I got my maths right)
                              Don't argue with idiot's on forums; people watching may not be able to tell the difference.

                              Sponsored by Midland Helicopters, CSM and OptiFuel.

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                              • #30
                                in PCM mode a JR 9X2 is only marginally slower than the DX7. To run the module it will be in PPM mode which is faster than PCM mode. Plus you have the faster transmission rate of 2.4 ghz.

                                I think the 9X2 module is worthwhile for these reasons, other tx I'm not so sure.
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