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HelicopterMain Discussion › Frequency hit by school yard
06-05-2004 04:01 PM  13 years agoPost 1
Raffy

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Chicago, Illinois

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Got up 6am to fly my heli at a school yard today. But upon take off I noticed the heli was taking off vertically on it's own even when I tried to bring it down. Then, I pulled back on the elevator, it responded but would not level back. I fought with it back and forth until I decided to hit throttle hold. Luckily all the controls functioned on auto and landed safely.
Checked all electronics in the heli and radio and everything was ok.
Looked at the roof of the school and saw a tall thick white antenna that's about 30' high. I packed my gear and went to a construction subdivision lot and flew my heli there with no interference.
What's that antenna on the roof for?

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06-05-2004 04:38 PM  13 years agoPost 2
S_Owen

rrApprentice

Wichita Falls, TX.

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Most public schools are being equipped with RF repeaters for emergency services (police, fire, paramedics, etc.). They want to be sure that if something bad happens, emergency services that enter the building will have good radio contact. Some schools also have campus radio stations.

[b]Murphy's Constant:[/b] Matter will be damaged in direct proportion to its value.

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06-05-2004 04:54 PM  13 years agoPost 3
maller

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Bucks County, PA

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So, to be safe - stay away from schools completely? They can be great when they're empty.



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06-05-2004 04:57 PM  13 years agoPost 4
daggit

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Claremont, MN

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I flew by one yesterday with no issues.

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06-05-2004 05:21 PM  13 years agoPost 5
AirWolfRC

rrProfessor

42½ N, 83½ W

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It's rather strange that you got hit on ONLY the collective and then everything was fine when the power was cut.

You may have other problems.

Wolfgang

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06-05-2004 06:24 PM  13 years agoPost 6
S_Owen

rrApprentice

Wichita Falls, TX.

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I am not saying that that caused the problem. They use different frequencies than we do. But, there may be something wrong with their TX or your RX, and being there just exposed the problem. It may be that your RX is just more susceptible to interference. Some are. Is it PPM or PCM?

[b]Murphy's Constant:[/b] Matter will be damaged in direct proportion to its value.

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06-05-2004 06:35 PM  13 years agoPost 7
AirWolfRC

rrProfessor

42½ N, 83½ W

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I'm saying that it is next to impossible for the school to have caused the problem.

Interference does not pick out a single channel like the collective and leave the other channels alone.

Wolfgang

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06-07-2004 04:55 AM  13 years agoPost 8
Raffy

rrElite Veteran

Chicago, Illinois

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I have a JR 8103 radio with an SPCM receiver. I said I fought with the controls- that means I was having a hard time leveling the heli and when it did I hit throttle hold at about 10 ft and luckily there was control to save the heli from crashing.
It would have been foolish for me to try and fly again at the school yard to find out if the problem would re-occur. My experience told me to get out of there!
Sure enough, I did not have any problems with my radio since I have logged in 6 flights with no problem flying at other open fields.

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06-07-2004 11:06 AM  13 years agoPost 9
w.pasman

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Netherlands

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It might be that that nearby transmitter injected some bad signal into your own transmitter, and that for some reason one stick was affected more than the other. Injection of HF signals is known to be able to cause weird effects in all kinds of electronics... [and humans as well ...]

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06-07-2004 01:33 PM  13 years agoPost 10
Raffy

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Chicago, Illinois

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injected some bad signal
That kind of describes what I experienced as the controls were going off and on.
It was an awful feeling as I gasped desperately to save my Raptor90 from plunging into the ground with the governor on.

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06-07-2004 02:12 PM  13 years agoPost 11
AirWolfRC

rrProfessor

42½ N, 83½ W

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Since you indicate that you had a "having a hard time leveling the heli", it sounds like you in fact did have interference. Good save.

Wolfgang

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06-07-2004 04:25 PM  13 years agoPost 12
AGRAV8

rrProfessor

Mosquito Coast......Houston Texas

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Scan it

I use an ICOM T-90A transciever (ham license required in the states) to scan the freqs I plan to fly and during operations as well. It lets me know if there are any "gremlins" waiting on a certain frequency, and has show that there is some areas that 72 MhZ channels are getting "hits" on. Not a cheap solution, but money well spent. I also carry it to a FF, not that I don't trust the impound folks.......

James

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HelicopterMain Discussion › Frequency hit by school yard
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