Whats needed to run digi servos?

[matthew2456]

You need a special gyro to make the most of digi servos, but if you are running them on cyclic can the rx send out a high enough frequency signal to make a difference?

[Disc]

its about the fact the digital servos have more torque generally and they are Faster and the other biggy they re-centre and are WAY more precise and thats what the guys need and want Speed - Torque and Precision.

Yes the RX can send a signal thats quick enough... Just depending on servo but its more down to how fast can you move the sticks that will be the slow down.

Large rx battery 2500ma (or better) or regulator and li-po are also getting to be a requirement to power this through the day.


Scale flyers commit the biggest crimes putting a 3001 on cyclic on 60 machines so not just a heavy airframe then add the weight of the body.. reading ebay sometimes makes you want to cry or run up to them and slap them

[matthew2456]

so why does the 401 have a digi function?

[robgt]

To allow you to run digital or analogue servos on the rudder, should you want...

Cheers,
Rob

[Disc]

so why does the 401 have a digi function?

Because its better than an analogue one

[matthew2456]

from what i gather the servo being digital means that within the servo the motor is driven by a higher frequency signal, I dont see the benefit of the digi mode on a 401 if both old and new "digital" servos work on the same external interface.

[robgt]

Digi mode is there to allow you to run non-digital servos on the rudder (if you don't want decent performance from your rudder ) - i.e. turn off digi-mode.
Otherwise, if running a digital servo, switch digital mode on.

Cheers,
Rob

[matthew2456]

But from what was said earlier, and I have read from futaba http://www.futaba-rc.com/servos/digitalservos.pdf , "digital" servos share the same input interface, from the rx, with non "digital" servos. Hence you can run digital servos from a normal receiver.

It is the signal inside the servo sent to the motor that has a higher resolution, done with a uP "digital", so why is there a need for a digital and non-digital mode on a 401 but not a receiver?

[robgt]

All servos share the same input interface to the Rx.
The difference comes in the servo itself - how fast and accurate it is at getting to the correct position specified by the pulse width received by the receiver, and also the number of "steps" or frames of movement (servo resolution) that can be made.
Digitals operate at a higher frequency, so you can command more precise movement from them.

The pdf you've read does actually mention this

Again, the reason the 401 has a switch for digi and non-digi mode is so that you can use either type of servo.
Cheers,
Rob

[matthew2456]

All servos share the same input interface to the Rx.

the reason the 401 has a switch for digi and non-digi mode is so that you can use either type of servo.

This is contradictory and the reason for my post

[Disc]

This is contradictory and the reason for my post

no your over reading it all

[matthew2456]

How?

All servos use the same interface, so why do you need an option for digital / std servos?

[SRH990]

The receiver doesn't control the tail servo, the gyro does so sends a different pulse width to the servo than the receiver would. If you connect an anologue servo to a 401 gyro (or any other with a digital setting) and leave the gyro set to 'digital' the servo will die very quickly.

[marktigere1]

The 401 sends a different frequency of pulses to a Digital servo (270Hz) than an analogue one.

A RX won't do this. You get the advantage of Digital positioning and response but no need to drive the servo's as hard as a Gyro does.

If you drive an analogue at that frame rate you would burn it out hence the switch.

Or I could be wrong completely.

Cheers

Mark

PS. Sorry, posted after SRH990. What he said.

[matthew2456]

The receiver doesn't control the tail servo, the gyro does so sends a different pulse width to the servo than the receiver would. If you connect an anologue servo to a 401 gyro (or any other with a digital setting) and leave the gyro set to 'digital' the servo will die very quickly.

By going on what you say then if you plug a digi servo into an rx you lose the benefits of the digital aspect which was my initial question.

My understanding from Futaba is that both types of servos use the same external interface, its the internal control pulses sent to the motor that are of different width.