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HelicopterThunder TigerOther › Raptor Interference
10-24-2004 12:56 AM  13 years agoPost 1
DOperchal

rrApprentice

Ft Rucker, AL

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I have a serious problem with my raptor. The past three crashes that i have had have been due to some type of interference. I went to a PCM reciever thinking that that will alleviate the problem but today i was locked out as my raptor went into the ground. It is not my flying field because it has happened at two different fields. Are there any inherient problems with the raptor getting RF interference. I am running a velociraptor 50 package with the Mavrikk tail supports and an aluminum center hub. Is there any way that i gan check for RF noise on the ground without flying it?

Need the help bad, $400+ in a month.

Peace through superior firepower

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10-24-2004 02:10 AM  13 years agoPost 2
TerryG

rrApprentice

So. Daytona, FL

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Why would you think using a PCM receiver would alleviate the problem? It won't - the best you could hope for is that it would hide the problem until it got bad enough to... Well, you already know where that comment is going.

There's nothing in the Raptor design that makes it more susceptible to RFI than other helis. It could be a bad bearing, bad servo(s) or perhaps a bad receiver crystal (is your PCM receiver using the same crystal as the previous PPM receiver?) It could be a transmitter problem, too, instead of an RFI issue.

How is the range check? Does the interference happen on the bench with engine stopped? Engine idling? How is the range check with engine idling (and someone holding the head)? Does it affect all channels, or just one? Are you using any 'cheap' servos, such as the throttle servo? If so, you might replace it.

Have you sent the radio in for repair/checkup after any of the crashes?

What antenna are you using - original wire, or stubby whip? Are there any servo or power leads within an inch or two of the antenna? If so, relocate them away from the antenna.

How old is the heli? How much flight time? When was the last time you tore it down and greased/replaced the high speed bearings (clutch stack, main shaft, and T/R shaft bearings)?

In short, LOTS of things can cause a loss of signal. Tracking down the cause is the fun part.


Terry

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10-24-2004 02:11 AM  13 years agoPost 3
raptorv2

rrApprentice

Deerfield Beach,​Florida

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no the raptor is plastic!!..you have a problem of course..how are you running your antenna?..close to the aluminum boom supports? what radio? Do you use a module? have you change crystals? , have you perform a range check with your antenna down and walk away at least 100 feet to see if you still have a link? There are so many things..

Since you change the receiver, it is obvious that the problem lies in your radio or the way you are running your antenna..

Also have you check you area to see if there are other fliers by?

hope this helps..

Mr. Hover

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10-24-2004 03:10 AM  13 years agoPost 4
Andrew_S

rrVeteran

Gaston, South​Carolina

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Someone else turning on a radio with the same frequency even?

Drewskie

www.congareeflyersinc.com

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10-24-2004 03:32 AM  13 years agoPost 5
DOperchal

rrApprentice

Ft Rucker, AL

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The PCM reciever is new. The range check checks out without any problems. I am running 9252's on everything but throttle where i am running an S3003. I am using a whip antenna beneath the landing gear and i have made sure that the lead is not coming out. The raptor is only a couple months old with a little over a gallon of fuel through it. And i fly at a private field with no other fliers.

When i get it fixed i will try to run the wires different see if that makes a difference.

Peace through superior firepower

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10-24-2004 03:46 AM  13 years agoPost 6
TMoore

rrMaster

Cookeville, TN

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PMFJI,

A range check with a PCM issue is pretty much of a useless venture. IOW, it doesn't tell you anything. It isn't like doing a range check on an FM RX because with the PCM Rx you can't measure the hits.

If I were you, the first place I would look is the whip. What sort of whip antenna is it? What battery pack, what radio, what gyro. Details please.

TM

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10-24-2004 04:15 AM  13 years agoPost 7
rtrickyjr

rrVeteran

Drumore, PA (SW of​Quarryville)

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Amperage?

Do you have enough reserve battery to prevent low spikes? Just a thought, I've seen some RR members talking of using Nmh without enough ma's to support the load, which creates low spikes. Only heard of the gyro dissengaging, but, might be worth a look ...

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10-24-2004 04:34 AM  13 years agoPost 8
DOperchal

rrApprentice

Ft Rucker, AL

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I have a deans whip antenna mounted underneath the landing gear. I am using a 4.8V1700-mah NiCad on a GY401. I am using a Futaba 8UAFS that has been flawless with the other 6 models i have on it.

Peace through superior firepower

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10-24-2004 04:37 AM  13 years agoPost 9
rtrickyjr

rrVeteran

Drumore, PA (SW of​Quarryville)

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Battery ...

Has the battery cycled well? Also, I had a Futaba switch that caused a similar type of problem. I only use the Gem rocker now, so far no problems.

I sure hope you can find something wrong, it'd be bad to fly it again without finding something

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10-24-2004 04:40 AM  13 years agoPost 10
TMoore

rrMaster

Cookeville, TN

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Is this a screw on type of Deans whip?

TM

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10-24-2004 04:20 PM  13 years agoPost 11
DOperchal

rrApprentice

Ft Rucker, AL

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I am using a JR heavy-duty switch on the RX. I am not using the screw on deans whip, just the one that sticks to a flat surface, ie the landing gear. I dont think however that it is the antenna. I changed receivers before my last crash using the original antenna without the whip.

Peace through superior firepower

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10-24-2004 04:25 PM  13 years agoPost 12
TMoore

rrMaster

Cookeville, TN

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Go back to the long antenna wire temporarily and take the Deans Whip out of the equation. The wire should be 39" long.

TM

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10-25-2004 01:05 AM  13 years agoPost 13
DOperchal

rrApprentice

Ft Rucker, AL

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Before my latest crash i installed another PCM reciever in the Raptor. I left the original long antenna on the reciever and i got severe enough interference that it locked me out for over 5 seconds.

Peace through superior firepower

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10-25-2004 02:50 AM  13 years agoPost 14
jerrythercpilot

rrVeteran

--South Florida --

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Have you ever dropped the Tx?

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10-25-2004 03:05 AM  13 years agoPost 15
DOperchal

rrApprentice

Ft Rucker, AL

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No. This transmitter has never been dropped.

Peace through superior firepower

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10-25-2004 03:09 AM  13 years agoPost 16
DOperchal

rrApprentice

Ft Rucker, AL

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Thanks for all the suggestions. I just packed up all of the equipment; 4 servos, Rx, Gyro, TJ Pro and sent it back to the manufactures for a check-up/repair. Hopefully they will find something wrong that contributed to my recent string of radio related crashed.

But if there are any other sugguestions or ideas i would really appreciate them.

Peace through superior firepower

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10-25-2004 03:13 AM  13 years agoPost 17
Glenn in Den

rrKey Veteran

Longmont, Colorado​area

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You're going to have to find someone near you with some equipment to listen and monitor the freq you're using. Or if you can't find anyone to help you with that, try changing frequencies.

It sounds like you are getting some external interference . . . either from a nearby R/C flyer or some other system. Could be almost anything or a strange combination of things. Are you flying near any businesses or power stations, etc.?

Around here, lots of people avoid channel 20 because of external interference. Keep in mind the interference doesn't have to be exactly on the frequency. It could be a mathematical multiple below it or a strong signal close to it or even two signals mixing.




Glenn.

I'm not really an R/C pilot, I stayed in a Holiday Inn Express last n

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10-25-2004 03:40 AM  13 years agoPost 18
TMoore

rrMaster

Cookeville, TN

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Were you using a remote glow? Sometimes these things can cause all sorts of havoc. Before you send it back to JR, put the TX in a metal filing cabinet and just crack the door so a little RF can get out and you can get your hand in to operate the sticks. With the full length antenna on the RX see if you can pull test all the connections, crank up a dremel (these are notorious for making all sorts of DC noise) and get it near the pcm and see if the RX goes into hold.

TM

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