ORIGINAL: rhklenke
ORIGINAL: specialFX
ORIGINAL: rhklenke
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I know of no ECU that will monitor the incoming pulses and filter them like an IPD receiver will, so the only way to get reliable shutdown on loss-of-signal is to use PCM.
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Bob
That´s not exactly true, the ACT diversity system provides reliable programmable failsafe with PPM. The system monitors signal integrity of both receivers and is able to establish safe transmission even if one RX completely fails. The integrated data-logging can be downloaded after each flight into a Palm for further investigation and storage on a PC. It logs signal strength and how often during a flight one (or even both) RX´s lost signal and in how many cases the diversity sys was able to recreate full connection. Very useful. Seems to be a well engineered system.
regards
Thomas
Maybe I wasn't clear. When I said ECU, I ment commercially available turbine ECU, e.g., JetCat, Artes, AMT, etc. As far as I know, none of these ECU's monitor the incoming signals to make sure that they "make sense" and aren't experienceing glitching. Therefore, as long as the glitching PPM signal stays within the operating range, the turbine will continue to run whereas the PCM failsafe function can (and SHOULD) be used to signal the ECU to shut the turbine down.
Bob
Bob, maybe i was not exact enough, but the ACT diversity system is a receiver system. You are right that ECU´s can´t make a decision which signals are correct and which are bad. but what all(?) actual ECU are able of is determinign if a signal is within acceptable range. And Failsafe programming with ACT diversity works like with other PCM RX´s. Teach the ECU a acceptable range and program your failsafe value far out of this, as done with PCM. No differencies here. And the diversity system eliminates any(!) glitches on servo signals within acceptable range. Like hold on PCM´s.
Thomas