Servo Shuffle - Servos responding to wrong channels

[bill marks]

[color=#000000]I need some help. I have just finished the guts of my WTC for a 1]

[Guest]

Bill,
I'm not an electrical engineer

Bill,
I'm not an electrical engineer but I am an inveterate tinkerer. Since no expert has offered any advice, I can offer some suggestions. I assume you disconnected one servo or electronic device, connected to the receiver, at a time. if that failed to identify an offending component, I suggest you check your receiver battery voltage. I once had similar problems with a 6 V receiver battery which had just been fully charged, and was causing a lot of servo chatter. After discharging it slightly, the chattering stopped.

[carcharadon]

I've had the same experience

I've had the same experience as Art with the 6 volt. At one time even made a solid state voltage reducer/regulator. This worked for awhile. The transistor I used was heat sensitive and would work fine when cooled underwater. I was doing some surface testing and it over heated, no good after that. Someone posted a circuit for a regulator? The receiver battery is happy at around 4-5 volts, above threshold it glitches, below doesn't work. 5 nicads @ 1.2v charged with a 6v charger seem to work ok.

[Guest]

Bill,
Also, with the SC10, once

Bill,
Also, with the SC10, once you have a glitch, they shut down and have to be "re-booted" by turning the receiver off for several seconds and then on again.

[wheels]

Bill...Are you using a BEC

Bill...Are you using a BEC for power? If so disconnect and use a 4.8 v battery. If you using a 6 volt battery you might try placing a diode is series with the rx. The diode will drop at least a 1/2 volt off the 6 volt battery. Let us know what you find.

Jim Wheeler

[bill marks]

I am using a BEC

I am using a BEC to step down from 7.2 V to 5 VDC. The rcvr voltage looked rock solid at 4.99 volts.

I removed the rcvr from the wtc tray and disconnected all servo so that nothing was hooked into the rcvr. I powered up the receiver with a 4.8 V NiCd battery pack and had the same symptoms as I plugged in each component, one at a time, into each channel (tried every servo in every channel).

- The SC-10 controllers didn't work in any channel
- The PC-4 didn't work in any channel unless it was tiped just about vertical
- Each channel had "cross talk" with adjacent channels. Ch 5 caused movement of the servo in CH4 at one end of the control stick and movement of the servo in CH 6 at the other end of the control stick.
- All servos "twitched" continuously. This may explain why the SC-10s don't work.

Everything was fine until a couple of days ago. There was no precipitating incident except maybe hooking up the BEC.

More thoughts?
Bill

[carcharadon]

Your doing everything right. Hate

Your doing everything right. Hate to say it but it seems like you may hve a bad component - receiver BEC? Can you substitute?

[PaulC]

This is a very interesting

This is a very interesting thread because I've experienced similar problems and so have at least one other SR5 member.

Are your transmitter and main power batts fully charged? I've had one of those "doh!" moments when my system was twitching like you describe and it was a matter of not enough juice.

In a separate incident, after stuffing all the components into my WTC-3 they would chatter then lock up. It was a matter of rearranging the wiring and receiver location -- apparently something was shorting out in my set-up.

Currently, my system runs fine with everything powered up. But if I lose the transmitter signal the servos chatter uncontrollably, the motor races (not particularly good during l.o.s.) and the failsafe refuses to engage. I'm told this is due to electronic interference from cell towers, etc.

[mit]

Well here is another EE's

Well here is another EE's opinion.

Sounds like your receiver is shot. Try replacing it.
All it takes is a little tuning offset and will not be able to de-modulate any signals.

I don't know what brand you are using but based on many many years of RC flying, I have become a firm believer of Dual conversion receivers and more so JR products. Berg Rx's are also excellent since they use a nice 4-pole DSP filter.

Try a different type of receiver if can or just use another Rx of the same brand.

I would like to know what brand it is.

Nick

[bill marks]

More good ideas. The Tx

More good ideas. The Tx and Rx are Futaba. I did charge up the Tx and separate (No BEC now) Rx batteries last night. No change.

I have all the antennas stretched out for max signal.

I am going to open up my other boat (BARBEL SS-580) and test my components on that Tx/Rx combination tonight. If I don't have the problems that way, I'll just order a new rcvr next month. I don't know what I will do if I still have the problem with a new Tx/Rx.

Bill

[feet wet]

Lots of good ideas thrown

Lots of good ideas thrown out here, I've got a couple more.
Any chance that you have Invisible Fence or similar system for your dogs? Beleive it or not, this will cause your symptoms.
Also try checking and changing your frequency crystals.
Did you alter the receiver antenna when you installed the receiver in the WTC? Make sure the connects are good and sealed from H2O
Good Luck

[bill marks]

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