Dual Rates Modification | Futaba 4nbf

[Ragemaster]

Has anyone seen or heard of a mod to add Dual rates to a Futaba Conquest fp-t4nbf ?

Or even a wayto turm them down internally?

How about adjusting endpoints internally?


Thanks in advance

[Ragemaster]

Also, does anyone have a source for schematics for Futaba? In particular the FP-T4NBF?

[Ragemaster]

bump

[Mr.RC-CAM]

It's a messy hack to add dual rates. Here is the basic method shown with a microcontroller based encoder. Your Tx's NE5044 encoder does not impact the design.

RC-CAM

[cmosfet]

Hi Mr. RC-CAM,

I am a friend of ragemaster and will attempt to perform this operation :)
Should the new pots be the same value as the stick pot?
Also, am I right in assuming that the extra pots act as endpoints and the switch puts them in or out of the circuit?

I guess one of the hard parts is finding a home for all the extra pots :)

Thanks much for your time and the info,

Kalman

[Mr.RC-CAM]

Should the new pots be the same value as the stick pot?The value determines how aggressive the dual rates will be. If it was me, I would try it with values that are about 1/2 the main pot's value. Prototype it this way and see if you like the adj range.

Also, am I right in assuming that the extra pots act as endpoints and the switch puts them in or out of the circuit?
Yes, that is all there is to it.

I guess one of the hard parts is finding a home for all the extra pots.
Yes, it will be a challenge to create something that has easy access to the trim pots.

RC-CAM

[Ragemaster]

:) Thanks for posting that Mr. RC-CAM.

Looking forward to your answer on the pots.

We really appreciate this!!!!

[Ragemaster]

Thanks!!
Looks like we posted at the same time!

[OmegaDot]

See the December 1979 issue of Model Aviation, page 20, for an article on adding analog dual rates and roll button to a Tx. I don't have a scaner, so can't post the schematic. I think the back issues of MA are archived on the AMA site now.

[clipclop]

These may be usefull they are for a NE5004 encoder system

[Ragemaster]

Thanks for all the replies.
I finally got around to trying this.
I tried to do this using the schematics above, but it doesn't effect anything. Servo still travels the same amount. Everynow and then I get some glitching on other channels. I tried with just the 4.7k pots and then added the 1.5 resistors. What am I missing here?

Essentially what you guys were saying is to add a switchable/variable resistance in parallel to the stick pot. Right? Or am I way off?

Am I suposed to disconnect the 3 wires going to the stick pot and somehow put the resitance in series?

I am still hoping to make this work, so any suggestions?
Thanks again for getting me started.

[Mr.RC-CAM]

Am I suposed to disconnect the 3 wires going to the stick pot and somehow put the resitance in series?
Yes. Just follow the schematics.

RC-CAM