Futaba RX failsafe

[miaguitaamarilla]

Hi people.

I just finished a home made dual RX for my heli, using a couple of FUTABA FP-R129DP (PCM 1024), some TTL circuits and a pic as "brain".The receivers are programmed to switch on channel 8 signal (for example +100%) when a failsafe is detected. Pic micro is checking CH8 signal of both receivers (and also CH7, as it integrates a Co-Pilot switch) and switches between the receivers. System was tested with two emmiters, one as Main as the other as secundary. When Main emitter was powered off, the secondary emmiter got control of the heli (in two different frecuencies, of course). The only "problem" I have is that receiver waits about 2 secs. when the main emitter is switched off until it activates CH8 signal... I supouse it tries to get correct data and waits 2 secs before considering it is a failure. I would like a 0.5 Secs. delay or so....
Is there a way of changing this delay? Do you know any way of doing signal failure check?

Thanks!

[AndyOne]

Hmmm, an interesting project but I can't help thinking you would create more reliable system by using a commercial fail-safe system such as found in PCM or the Multiplex system using only one frequency.

Multiple frequency systems tend to use 3 separate channels and the logic at the business end compares all three and ignores which ever signal does not agree with the other two. If you only have two frequencies how do you know which is the correct signal.

Andy.

[miaguitaamarilla]

Hi Andy.

In fact, I use two PCM receivers with fail-safe system that activate a signal on CH8 when detecting a fail-safe... the problem I have is that the receiver takes about 2 secs until it considers a fail-safe .. I was wondering if there is a way of detecting a fail-safe earlier, don't know if the receiver can be programmed that way or there is some signal inside de Rx I can check.

Regards

Roman.

[Mr.RC-CAM]

JR allows you to change the flywheeling time. Down to 250mS. But, I do not believe Futaba has such a feature. If your Tx supports this then it will be in the Failsafe section of your manual.

RC-CAM

[e-sailpilot86]

ack... I didn't know the Futaba FS could be that slow...