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HelicopterMain Discussion › Servo question
04-26-2004 08:50 PM  13 years agoPost 1
helimanzero

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Lancashire UK

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HI
Can digital servos be used with ppm receivers and can standard servos be used with pcm receivers ???

thanks

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04-26-2004 08:51 PM  13 years agoPost 2
armageddon

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N. Y.

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yes on both...

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04-26-2004 08:53 PM  13 years agoPost 3
helimanzero

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Lancashire UK

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cheers armageddon

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04-26-2004 09:07 PM  13 years agoPost 4
Darksider

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Derby United Kingdom

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it does work but it isn't just as simple as yes they work, there can be many complications with running digital servo's on a ppm reciever, for the best safety you should use pcm for all digital heli's, if however you only plan to run say 2 digital servo's including the tail and the rest are analogue, you can often get away with it, but each time you change an analogue for a digital your increasing the amount of noise the reciever has to filter leading often to glitching problems.

Gareth

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04-26-2004 09:27 PM  13 years agoPost 5
helimanzero

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Thanks Gareth
I will probably get PCM with digital servos, you dont need a fail safe unit connected to the throttle servo with PCM do you?

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04-26-2004 09:52 PM  13 years agoPost 6
Darksider

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Derby United Kingdom

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if you use a pcm reciever, you can set the failsafe's for all channels in the event of a transmitter failure/loss of signal, so no you dont need to use one, only exception i know of to this rule is if your flying a turbine heli, i believe there's a rule that all turbine's have to have independant throttle failsafe's fitted, they were mainly designed with ppm in mind anyway to allow you to still let your throttle go to idle but all your other channels would hold their last recieved positions as is normal with loss of signal in ppm, basically a heli that crashes at idle looks alot better than one that came in at full throttle after a crash, when at full they pretty much rip themselves to bits.

hope this helps

Gareth

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04-27-2004 02:56 AM  13 years agoPost 7
TMoore

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Cookeville, TN

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Gareth,

What radio are you running that won't allow you to use 5 digitals on FM/PPM?

Terry

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04-27-2004 05:03 AM  13 years agoPost 8
Fullagas

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Michigan

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.
Darksider,

I believe yes is the right answer in both instances.

What do you base your opinion on? I've seen nothing from any radio manufacturer that recommends PCM for digitals. I've been running standard servos on PCM and PPM for years. I don't see how a digital servo would operate any differently using PPM or PCM. But I'm not a radio guru, either.



.

Flying helis since gyros had springs.

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04-27-2004 10:07 AM  13 years agoPost 9
Darksider

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Derby United Kingdom

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i use jr radio gear, to answer your question terry, fullagas yes is the right answer but as i said above it just isn't that simple, i base my opinion solely on my experience of trying to use all digital servo's on a ppm reciever, if i plug them in yes they'll work the same way as an analogue would, but they'll glitch, very few ppm reciever's are good enough to filter all the noise created by digital's escpecially when your trying to use all digital servo's, a couple i've heard of are the schulze and the multiplex ipd ones, though i've never tried them, it's far easier to just buy a pcm reciever.

Gareth

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