AP2000i Glitch counter??

[dreslism]

I experienced some glitch counting myself this past weekend with my ap2000i, but never visually experienced anything "wrong" with the heli. After a 3 minute flight, my glitch count was at 12, but I would never have known or seen anything.

In another thread, Gary G. statee he was running a DP148 Rx which is a PCM Rx right?

In my mind, if there is a glitch on the PCM Rx, it is either going to hold last state, or put out your pre-programmed position as it jumps into fail safe right?

By your PCM Rx going into failsafe, the ap2000i is downstream of the Rx, so how can the ap2000i see any glitches?

For an PPM Rx, I could see the ap2000i counting glitches, but I can't see how it could with a PCM Rx.

I am asking this as I was all excited about the ap2000i glitch count after hearing DJ talk about it. I asked Angelos to put in the auto display of the glitches, and then I *thought* I realized this would be useless as I am running a PCM Rx, so the ap2000i would never see the glitches.

I know DJ, has seen glitch counts on his ap2000i, Gary has, Mark has, I have, and Robert (rerazor) have all seen glitch counts on our ap2000i.

DJ, Mark, and Robert I believe all had the swash twitch which gave glitch counts on the ap2000i, and have all fixed the glitches which seemed to be externally introduced due to tail static. I could see this causing the ap2000i to count glitches, but with a PCM Rx, I would NEVER expect the ap2000i to see a glitch.

Is it possible for the ap2000i to see glitches with a PCM Rx?

Hopefully Angelos will chime in here.

[GGoodrum]

Hmmm, good question. Mine could've been the same swash twitch problem as well. Nonetheless, I have had numerous times, both on my Raptor and on my Logo 10, where I've momentarily lost control, and have had lots of weird things happen with the camera controls. Now that I have all DX7/DX6-based receviers, I have had zero problems. Well, zero problems with the Logo 10, which is the only one flying at the moment. Both my Raptors are apart at the moment.

-- Gary

[AZ ChopperCam]

about 50% of the time I end up with 2 glitches. today I had 6 on one flight. many times sero. I never see the helicopter glitch.

One thing I did notice is if I use a metal screwdriver to push the button to see the glitch menu(do not have latest firmware) I can sometimes induce a clitch if the crewdriver rubs the carbon face. I've tested that by doing right after a flight with a plastic screwdriver and it's zero then I use a metal one and rub the carbon face when I do it and it reads 1 or 2.

Not sure on lost frames. Even if the PCM goes into lockout it'll still feed the AP a clean signal so not sure on the purpose of bad frames indicator

[Angelos]

The glitch counter is only beneficial on PPM receivers. The PCM receivers mask out all radio glitches. If the AP-2000i is counting glitches they must be induced after the receiver. It could be from occasional static discharge being picked up from the input cables of the AP-2000i or electrical noise from motor or ESC. Very likely these few glitches that the AP-2000i sees at its inputs don’t all come at the same time and this is why you don’t see the helicopter respond. It is also possible the servo cables after AP-2000i may also occasionally pick up similar glitches but there is nothing there to count them. A single glitch is too short to make the heli move.

You may be able to avoid these glitches by routing the input cables different or making them shorter if you don’t need the full length or coil the excess legth around a ferrite ring. I’ll also try to replicate this here (must make some sort of static/noise generator) and also have a look if there is anything wrong in the firmware that may be incorrectly counting glitches.

[QUOTE]One thing I did notice is if I use a metal screwdriver to push the button to see the glitch menu(do not have latest firmware) I can sometimes induce a clitch if the crewdriver rubs the carbon face. I've tested that by doing right after a flight with a plastic screwdriver and it's zero then I use a metal one and rub the carbon face when I do it and it reads 1 or 2.[\QUOTE]

The front panel of the AP-2000i is conductive and connected to the radio system ground. The glitch could be due to static discharge between you and the helicopter. If possible try using a plastic tool. If it stops doing it my theory is probably correct.

-Angelos

[dreslism]

The glitch counter is only beneficial on PPM receivers. The PCM receivers mask out all radio glitches. If the AP-2000i is counting glitches they must be induced after the receiver. It could be from occasional static discharge being picked up from the input cables of the AP-2000i or electrical noise from motor or ESC.
-Angelos

Thanks for the clarification Angelos. That's what I was expecting you would say. (Only good for PPM)

[rerazor]

I had the "collective glitch" I could spool up the heli without blades and the swash would raise and drop (120 ccpm). All three servos moved together. It has happened in test flights and the heli quickly jumps. Pretty much freaks you out and is a great reason to land and :dontknow :dontknow . I have grounded my tail servo boom mount to a common and to the negative of the UBEC. Last 3-4 flights have shown zero on the glitch count.

I have also noticed the glitch when touching the Api with a metal screw driver etc... that DJ posted.