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HelicopterRadio - Spektrum DSM › Signal issue AR6100's in a metal building - anyone​else?
11-30-2011 03:04 AM  5 years agoPost 21
jschenck

rrProfessor

La Vista, NE.

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I would stil guess that the uncommanded full negative may have been a result of something other than radio interference BUT having said that I did have my 450 running an older AR6100 go into full negative uncommanded. I had plenty of time regain it since I was inverted and it's a tall ceiling (indoor vollyball court) but didn't get it back. The heli hit some duct work and hit a few items on the way down. It went straight up from a very low and steady inverted hover so it was full negative. The AR7000 I put in there following that incident works great in there. It's an older one without quickconnect so I don't know if I've had a radio issue on one rx but not the other on the AR7000.

Again, as I've said a few time here the DSMX AR6115's haven't seen this issue. Several of us in the club flew DX8's last year, all had problems in there, all have no problems since switching to DSMX rx's as far as I remember, other than unrelated hardware problems on the DX8 such as the loose gimbal wiring harness. We were working with Horizon on this issue at our club and they were very supportive.

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11-30-2011 03:27 AM  5 years agoPost 22
pgoelz

rrVeteran

Rochester MI

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The only other explanation that makes (partial) sense is tail belt static. It had been longer than I care to admit since I sprayed the tail belt and it could have discharged and confused the receiver. Under those circumstances, probably anything is possible.

I kinda like the idea of DSMX, but I'm not sure about replacing all my receivers. I could conceivably replace just the ones I fly indoors. I hear my DX7 can be retrofitted to do DSMX. The way DSMX was explained to me, it is a frequency hopping scheme similar to Futaba but it apparently only hops to frequencies that it determines are the least busy. Not sure if it is continuously hopping or only when necessary.

Paul

Paul Goelz
Rochester MI USA
http://www.pgoelz.com

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12-12-2011 07:05 PM  5 years agoPost 23
pgoelz

rrVeteran

Rochester MI

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More input....

I swapped the version 1.2 AR6100 in my Trex 450 for a later model AR6200 with rapid reconnect. It seemed to be OK for a couple indoor sessions and then last week it once again acted in a way that I cannot explain.

I had flown a normal uneventful flight and I had landed. I was sitting on the ground at about -2 degrees collective and while my head was turned to talk to someone, I heard the heli "grunt" for a couple hundred mS. It had returned to normal operation by the time I turned my head back to look at it. The person I was talking to said that it looked like it squatted and the tail rotor contacted the astro turf. I initially thought it had gone full aft cyclic but I now think it was the same uncommanded full negative collective that crashed me a couple weeks ago. After the event, the LED in both receivers was steady, not flashing.

Again, the issue here (and in the event the OP reported) is not that something might have happened to the RF link.... that would not surprise me at a crowded indoor session. The issue is that something moved my servos and it wasn't my transmitter. THAT is not supposed to be possible.

At the time, my failsafe programming was full negative collective. However, as I understand it, the only time that failsafe is invoked is during boot. After connection, a corrupted RF link is supposed to cause a "hold in place", not failsafe. If the radio rebooted, the LED would be flashing. It was not.

I have been trying to get comment from Spektrum on this via HH support but after a couple weeks, they have not seen fit to contact me.

I have subsequently re-programmed failsafe to be zero pitch so if it happens again, it will not produce such an extreme reaction. But unless I can find another explanation, this is a safety issue at indoor flying sessions. Especially with 450 size helis.

Paul

Paul Goelz
Rochester MI USA
http://www.pgoelz.com

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