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Spockie-Tech
Site Admin
Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia
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In "PCM" mode, the data transferred between the Tx and the RX is quite complex, and has all sorts of addtional information in the stream for failsafes, error correction and many other things.
There are some web pages out there where people have attemtped to reverse-engineer the Futaba PCM1024 (and higher) protocols and found it a real black art, so I can understand why the Spectrum module wouldnt work in that situation..
*However*, Once you put the Tx into "FM" mode (which the 7Cap and presumably the 9CAP) will do, then the final modulated data stream that is sent to the RF module turns back into the simple variable-width pulse train that nearly all Radio's use, and there is no reason that a Spectrum module couldnt take that and encapsulate it in its own data packets.
In FM mode, all the clever mixing, curves, channel interrelationships and so on are all done in the Tx and end up as a simple "servo 1 goes here, servo 2 goes there" stream.
Using "FM" mode would not present any operational disadvantages reliability wise since the Spectrum Module would handle signal-integrity issues, I'm not sure how the the fail-safes might work though.
There may some minor some positive/negative signal polairty issues, but when you get down to it, just 3 wires go the RF mdoule. power, ground and data, and it should be easy to adapt a JR capable unit to run from a Futaba (ignoring physical mounting issues). _________________ Great minds discuss ideas. Average minds discuss events. Small minds discuss people
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Thu Feb 09, 2006 7:11 pm |
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