Radio Range Trouble.
10-24-2004 | 07:02 PM
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From: Kristiansand, NORWAY
Radio Range Trouble.
Radio range trouble with the turbine running.
When the turbine running I only get about 180-200 Meter radio range before it enter fail safe, with the TX antenna fully extend.
Turbine in use are Sonic 7000,with manual start.From Sim Jet.
Radio in use are..PCM10X And MX22 (JR)
Receiver in use are...MC20 And SMC-20 DS.
Have also try with only the “ECU” and battery (no switch) connected to the receiver with the same result.
Then take out the receiver battery pack and the wipe antenna, and move it so far away from the “ECU” and fuel pump that the throttle cable allowed. Still same result.
The plane are not new build this problem came up after 20 Flights. And happened on the second flight that day. It went in fail safe, the turbine shut down and I got the control back and make a dead stick landing.
Then I change Receiver(SPCM dual conversion),wipe antenna, and a new channel on the radio. Never use before. And I also got a different TX.Make range test on the ground with the antenna down everything look OK. Take of and in the first turn......Fail Safe. And the history repeat. This time it was on a different airfield, and I was the only one with problem.
I try with a new fuel pump but NO.
So something have start to make “noise” and weaken the incoming radio signal. So I only get this short range.
When the turbine is not running the range are not a problem.
I have been looking over the “ECU” after bad soldering, but look OK to me.
So now I desperately need some good advise.
Anyone?
Sorry for the bad English. School wasn't mine thing.
Roy Jimmy.
When the turbine running I only get about 180-200 Meter radio range before it enter fail safe, with the TX antenna fully extend.
Turbine in use are Sonic 7000,with manual start.From Sim Jet.
Radio in use are..PCM10X And MX22 (JR)
Receiver in use are...MC20 And SMC-20 DS.
Have also try with only the “ECU” and battery (no switch) connected to the receiver with the same result.
Then take out the receiver battery pack and the wipe antenna, and move it so far away from the “ECU” and fuel pump that the throttle cable allowed. Still same result.
The plane are not new build this problem came up after 20 Flights. And happened on the second flight that day. It went in fail safe, the turbine shut down and I got the control back and make a dead stick landing.
Then I change Receiver(SPCM dual conversion),wipe antenna, and a new channel on the radio. Never use before. And I also got a different TX.Make range test on the ground with the antenna down everything look OK. Take of and in the first turn......Fail Safe. And the history repeat. This time it was on a different airfield, and I was the only one with problem.
I try with a new fuel pump but NO.
So something have start to make “noise” and weaken the incoming radio signal. So I only get this short range.
When the turbine is not running the range are not a problem.
I have been looking over the “ECU” after bad soldering, but look OK to me.
So now I desperately need some good advise.
Anyone?
Sorry for the bad English. School wasn't mine thing.
Roy Jimmy.
10-25-2004 | 03:34 AM
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From: richmond hill,
GA
RE: Radio Range Trouble.
do you have a lot of carbon fiber near the rx? you have changed out all of the radio gear(tx rx) so that should rule them out as your problem. check the turbine for hi speed balancing. put your finger nail on the housing and feel for a vibration. let me know
10-25-2004 | 03:53 AM
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From: Kristiansand, NORWAY
RE: Radio Range Trouble.
Nope.No Carbon fiber in this jet.Only fiber glass,and some Kevlar. And is no "bad sound"or vibration from the Turbine.By the way the bearing was change 6-7 Flights ago.And the turbine have a major check by the manufacturer.And I know what a unbalanced turbine sound like,by experience.
This problem is driving me nuts,so any input are welcome.
Roy Jimmy
This problem is driving me nuts,so any input are welcome.
Roy Jimmy
10-25-2004 | 04:52 AM
#6
RE: Radio Range Trouble.
make sure that your RX antenna and servo leads are as far away from your ECU and Fuel pump as you can get them! Are you using a whip antenna on your RX or is it stock? I had this problem even with the antenna outside of the plane and I put on a Revolution antenna and it fixed the problems.
10-25-2004 | 06:10 AM
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From: Littleton,
CO
RE: Radio Range Trouble.
ORIGINAL: Roy Jimmy
Radio range trouble with the turbine running.
When the turbine running I only get about 180-200 Meter radio range before it enter fail safe, with the TX antenna fully extend.
Turbine in use are Sonic 7000,with manual start.From Sim Jet.
Radio in use are..PCM10X And MX22 (JR)
Receiver in use are...MC20 And SMC-20 DS.
Have also try with only the “ECU” and battery (no switch) connected to the receiver with the same result.
Then take out the receiver battery pack and the wipe antenna, and move it so far away from the “ECU” and fuel pump that the throttle cable allowed. Still same result.
The plane are not new build this problem came up after 20 Flights. And happened on the second flight that day. It went in fail safe, the turbine shut down and I got the control back and make a dead stick landing.
Then I change Receiver(SPCM dual conversion),wipe antenna, and a new channel on the radio. Never use before. And I also got a different TX.Make range test on the ground with the antenna down everything look OK. Take of and in the first turn......Fail Safe. And the history repeat. This time it was on a different airfield, and I was the only one with problem.
I try with a new fuel pump but NO.
So something have start to make “noise” and weaken the incoming radio signal. So I only get this short range.
When the turbine is not running the range are not a problem.
I have been looking over the “ECU” after bad soldering, but look OK to me.
So now I desperately need some good advise.
Anyone?
Sorry for the bad English. School wasn't mine thing.
Roy Jimmy.
Radio range trouble with the turbine running.
When the turbine running I only get about 180-200 Meter radio range before it enter fail safe, with the TX antenna fully extend.
Turbine in use are Sonic 7000,with manual start.From Sim Jet.
Radio in use are..PCM10X And MX22 (JR)
Receiver in use are...MC20 And SMC-20 DS.
Have also try with only the “ECU” and battery (no switch) connected to the receiver with the same result.
Then take out the receiver battery pack and the wipe antenna, and move it so far away from the “ECU” and fuel pump that the throttle cable allowed. Still same result.
The plane are not new build this problem came up after 20 Flights. And happened on the second flight that day. It went in fail safe, the turbine shut down and I got the control back and make a dead stick landing.
Then I change Receiver(SPCM dual conversion),wipe antenna, and a new channel on the radio. Never use before. And I also got a different TX.Make range test on the ground with the antenna down everything look OK. Take of and in the first turn......Fail Safe. And the history repeat. This time it was on a different airfield, and I was the only one with problem.
I try with a new fuel pump but NO.
So something have start to make “noise” and weaken the incoming radio signal. So I only get this short range.
When the turbine is not running the range are not a problem.
I have been looking over the “ECU” after bad soldering, but look OK to me.
So now I desperately need some good advise.
Anyone?
Sorry for the bad English. School wasn't mine thing.
Roy Jimmy.
First thing to do is find out exactly what your Baseline range is (nothing but your receiver & servos operating). If you have the ability to do it with trans ant fully extended fine. The distance you get should be no less than 4 tenths of a mile (2112 feet). The test is done turning the transmitter & aircraft in all relative positions to one another. The aircraft must be on a non-metallic stand and about 3 feet above the ground. If you can't get at least 1584 feet fail-safe free solid... something is wrong with your transmitter or receiver R/F link and you must get that fixed first. Find exactly your Baseline range and let us know what that is, and how you did the test (exact details)! If you want to do the test with the transmitter antenna removed you can just report exact distances and method. More later got to go to work now...
Lee H. DeMary
AMA 36099
10-25-2004 | 07:33 AM
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From: Kristiansand, NORWAY
RE: Radio Range Trouble.
OK.
Here are the way I was check the range. First only the battery pack and one servo connected in the receiver. Program this servo to a different position when entering fail safe mode. Turn on the radio and the antenna fully extended. The radio was place about 2 meters high. And free area between the TX and RX.
I was holding the Receiver, whip antenna and the servo in my hand. And was start walking (The was a lot of walking this weekend)
And I reach about 400-500 Meters (1160 feet) And still have a good signal I put the whip antenna on the ground nothing happened. I take the whip itself out of the connector, then and only then I got the fail safe. To me this look to be a good radio gear.
And so to the next test. The turbine , “ECU” and the ECU battery still in the airframe. Out side we have the receiver battery, the receiver and the wipe antenna. And the only connection is the throttle cable from the “ECU”. Make a start up, spool up the turbine got the green lamp flashing that show the full rpm. Is OK. Throttle back to idle. Take out the antenna on the TX. And start walking. The air frame are in a wood stand. After ca 180-200 meters (590-656 feet). Fail safe and the turbine shut down. Before this we was doing several testing with every thing in the airframe and every thing connected. With the turbine running I always get to the same spot 590-650 Feet and it shut down. After is shut down everything else working fine again. And this was the same thing I feel when I got this thing happened in the air, Fail safe no responding on the stick, after the shut down the control got back.
And look at the facts that I was using to different radio gear, also a different whip. I cannot see the problem are coming from here. Every battery pack is check out.
The only thing that have been the same all the way is the turbine and the “ECU”.
We also making a test with another jet with the same equipment in it. Let the turbine running on idle, take the TX and start walking the way I know very well after 1600 Feet we still not have any problem, I have to turn the TX off to get the airframe to get in fail safe. And the airframe was on the exact same spot as mine use to stand. This was a long story, but I think its been explain how we have performed this test.
Here are the way I was check the range. First only the battery pack and one servo connected in the receiver. Program this servo to a different position when entering fail safe mode. Turn on the radio and the antenna fully extended. The radio was place about 2 meters high. And free area between the TX and RX.
I was holding the Receiver, whip antenna and the servo in my hand. And was start walking (The was a lot of walking this weekend)
And I reach about 400-500 Meters (1160 feet) And still have a good signal I put the whip antenna on the ground nothing happened. I take the whip itself out of the connector, then and only then I got the fail safe. To me this look to be a good radio gear.
And so to the next test. The turbine , “ECU” and the ECU battery still in the airframe. Out side we have the receiver battery, the receiver and the wipe antenna. And the only connection is the throttle cable from the “ECU”. Make a start up, spool up the turbine got the green lamp flashing that show the full rpm. Is OK. Throttle back to idle. Take out the antenna on the TX. And start walking. The air frame are in a wood stand. After ca 180-200 meters (590-656 feet). Fail safe and the turbine shut down. Before this we was doing several testing with every thing in the airframe and every thing connected. With the turbine running I always get to the same spot 590-650 Feet and it shut down. After is shut down everything else working fine again. And this was the same thing I feel when I got this thing happened in the air, Fail safe no responding on the stick, after the shut down the control got back.
And look at the facts that I was using to different radio gear, also a different whip. I cannot see the problem are coming from here. Every battery pack is check out.
The only thing that have been the same all the way is the turbine and the “ECU”.
We also making a test with another jet with the same equipment in it. Let the turbine running on idle, take the TX and start walking the way I know very well after 1600 Feet we still not have any problem, I have to turn the TX off to get the airframe to get in fail safe. And the airframe was on the exact same spot as mine use to stand. This was a long story, but I think its been explain how we have performed this test.
10-25-2004 | 07:58 AM
#9
RE: Radio Range Trouble.
Hi all!
I was there this weekend and try to help Roy Jimmy with this interference issue!
I was sitting beside the airplane when Roy Jimmy was standing about 2-300 meters down the runway with the radio (antenna fully stretched out)
When the turbine and ECU was shut off, there were no problems. There was also no problems when the turbine was at idle.
When throttle was increased and the turbine ramped up, it entered fail-safe (could tell because flap is raised in FS mode). When the turbine again reached idle, everything was working perfectly again. Because Roy Jimmy at that time had the throttle up, the turbine started to ramp up again and then it entered fail-safe again and so on.....
He has tried with different radios, crystals, receivers. we also moved the fuel pump on the outside of the plane when running + that we also tried with a new fuel pump.... Results was still the same.
I was told that a turbine with ceramic bearings could not cause interference, but now I am not so sure anymore...???
Any clues anyone??
I was there this weekend and try to help Roy Jimmy with this interference issue!
I was sitting beside the airplane when Roy Jimmy was standing about 2-300 meters down the runway with the radio (antenna fully stretched out)
When the turbine and ECU was shut off, there were no problems. There was also no problems when the turbine was at idle.
When throttle was increased and the turbine ramped up, it entered fail-safe (could tell because flap is raised in FS mode). When the turbine again reached idle, everything was working perfectly again. Because Roy Jimmy at that time had the throttle up, the turbine started to ramp up again and then it entered fail-safe again and so on.....
He has tried with different radios, crystals, receivers. we also moved the fuel pump on the outside of the plane when running + that we also tried with a new fuel pump.... Results was still the same.
I was told that a turbine with ceramic bearings could not cause interference, but now I am not so sure anymore...???
Any clues anyone??
10-25-2004 | 09:48 AM
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From: Oslo,
RE: Radio Range Trouble.
Hello Roy
Thank's for last weekend from us that kept it going.
I recommend you to call Lars at SimJet and explaine him the problem. It could bee a possibilety that
he knows something that we smart gays dont know. As you all remember he invented SimJet and all
the following problems!
But he always help you out. If not, I will call him for you.
Cato Horten
Thank's for last weekend from us that kept it going.
I recommend you to call Lars at SimJet and explaine him the problem. It could bee a possibilety that
he knows something that we smart gays dont know. As you all remember he invented SimJet and all
the following problems!
But he always help you out. If not, I will call him for you.Cato Horten
10-25-2004 | 09:57 AM
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From: Kristiansand, NORWAY
RE: Radio Range Trouble.
My legs still hurt after that weekend. (keep on walking).
I will give Lars a e-mail.
Don't forget I was the first one in the air Saturday morning. OK the flight was short.
But remember the fuel cost.
I will give Lars a e-mail.
Don't forget I was the first one in the air Saturday morning. OK the flight was short.
But remember the fuel cost.
10-25-2004 | 10:40 AM
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From: Oslo,
RE: Radio Range Trouble.
Hello
Fuel cost on your car or your plane?Dont send them a e-mail. Call them. The video of your flight was greate. I am
working on an DVD film from this weekend. App. 45 min. of film.
Cato
Fuel cost on your car or your plane?
Dont send them a e-mail. Call them. The video of your flight was greate. I amworking on an DVD film from this weekend. App. 45 min. of film.
Cato
10-25-2004 | 10:56 AM
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From: Johannesburg, SOUTH AFRICA
RE: Radio Range Trouble.
Roy Jimmy
Sorry to hear you are battling. I think you are pretty sure that it is not radio problems.
I had a similar problem with my Kangeroo. I eventually put some thin silicon tubing around the EGT sensor which ran down the side of the motor and have had 55 trouble free flights since then.
If it was the pump, you should see it at idle as well. As some people have said before, no mounting boards of carbon fibre, try and seperate the RX and ECU batteries. Don't run their wires together. Try moving the controller around in the fuselage. Have you tried another whip antenna?
Good luck
Zane
Sorry to hear you are battling. I think you are pretty sure that it is not radio problems.
I had a similar problem with my Kangeroo. I eventually put some thin silicon tubing around the EGT sensor which ran down the side of the motor and have had 55 trouble free flights since then.
If it was the pump, you should see it at idle as well. As some people have said before, no mounting boards of carbon fibre, try and seperate the RX and ECU batteries. Don't run their wires together. Try moving the controller around in the fuselage. Have you tried another whip antenna?
Good luck
Zane
10-25-2004 | 11:58 AM
#14
RE: Radio Range Trouble.
Roy Jimmy,
The only time that have seen a problem like this it was cured by fitting a ferrite bead on the ECU lead to the RX. The difference was dramatic.
However, what I do not understand is how you could have 20 flights before this problem occurred. Did you change anything at this point? The number one suspect in our jets is the pump motor. It is a perfect electrical noise generator. Try the ferrite bead you have nothing to loose.
Regards,
John.
The only time that have seen a problem like this it was cured by fitting a ferrite bead on the ECU lead to the RX. The difference was dramatic.
However, what I do not understand is how you could have 20 flights before this problem occurred. Did you change anything at this point? The number one suspect in our jets is the pump motor. It is a perfect electrical noise generator. Try the ferrite bead you have nothing to loose.
Regards,
John.
10-25-2004 | 12:58 PM
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From: Kristiansand, NORWAY
RE: Radio Range Trouble.
That about the 20 flight before the problem, is the main reason that drive me nuts.Nothing is change,and the problem occurred from one flight to the next.????.
I been thinking about the ferrite on this cable, but I been told that this not doing anything on a PCM receiver.But work perfectly well on a PPM receiver.
But I will try it out.
And yes I have try two types of whip antenna.
And its no EGT sensor running outside the turbine, its a manual start on this one.
I been looking all over after metall to metall that will make "noise"
Roy Jimmy
I been thinking about the ferrite on this cable, but I been told that this not doing anything on a PCM receiver.But work perfectly well on a PPM receiver.
But I will try it out.
And yes I have try two types of whip antenna.
And its no EGT sensor running outside the turbine, its a manual start on this one.
I been looking all over after metall to metall that will make "noise"
Roy Jimmy
10-25-2004 | 02:47 PM
#16
RE: Radio Range Trouble.
Roy Jimmy,
Whoever told you that these things do not work with pcm was WRONG! PCM or PPM it makes no difference. The case I mentioned had a PCM reciever. Try it, you have nothing to loose. Either it will work or it won't.
Regards,
John.
Whoever told you that these things do not work with pcm was WRONG! PCM or PPM it makes no difference. The case I mentioned had a PCM reciever. Try it, you have nothing to loose. Either it will work or it won't.
Regards,
John.
10-25-2004 | 08:45 PM
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From: Littleton,
CO
RE: Radio Range Trouble.
ORIGINAL: Roy Jimmy
OK.
Here are the way I was check the range. First only the battery pack and one servo connected in the receiver. Program this servo to a different position when entering fail safe mode. Turn on the radio and the antenna fully extended. The radio was place about 2 meters high. And free area between the TX and RX.
I was holding the Receiver, whip antenna and the servo in my hand. And was start walking (The was a lot of walking this weekend)
And I reach about 400-500 Meters (1160 feet) And still have a good signal I put the whip antenna on the ground nothing happened. I take the whip itself out of the connector, then and only then I got the fail safe. To me this look to be a good radio gear.
And so to the next test. The turbine , “ECU” and the ECU battery still in the airframe. Out side we have the receiver battery, the receiver and the wipe antenna. And the only connection is the throttle cable from the “ECU”. Make a start up, spool up the turbine got the green lamp flashing that show the full rpm. Is OK. Throttle back to idle. Take out the antenna on the TX. And start walking. The air frame are in a wood stand. After ca 180-200 meters (590-656 feet). Fail safe and the turbine shut down. Before this we was doing several testing with every thing in the airframe and every thing connected. With the turbine running I always get to the same spot 590-650 Feet and it shut down. After is shut down everything else working fine again. And this was the same thing I feel when I got this thing happened in the air, Fail safe no responding on the stick, after the shut down the control got back.
And look at the facts that I was using to different radio gear, also a different whip. I cannot see the problem are coming from here. Every battery pack is check out.
The only thing that have been the same all the way is the turbine and the “ECU”.
We also making a test with another jet with the same equipment in it. Let the turbine running on idle, take the TX and start walking the way I know very well after 1600 Feet we still not have any problem, I have to turn the TX off to get the airframe to get in fail safe. And the airframe was on the exact same spot as mine use to stand. This was a long story, but I think its been explain how we have performed this test.
OK.
Here are the way I was check the range. First only the battery pack and one servo connected in the receiver. Program this servo to a different position when entering fail safe mode. Turn on the radio and the antenna fully extended. The radio was place about 2 meters high. And free area between the TX and RX.
I was holding the Receiver, whip antenna and the servo in my hand. And was start walking (The was a lot of walking this weekend)
And I reach about 400-500 Meters (1160 feet) And still have a good signal I put the whip antenna on the ground nothing happened. I take the whip itself out of the connector, then and only then I got the fail safe. To me this look to be a good radio gear.
And so to the next test. The turbine , “ECU” and the ECU battery still in the airframe. Out side we have the receiver battery, the receiver and the wipe antenna. And the only connection is the throttle cable from the “ECU”. Make a start up, spool up the turbine got the green lamp flashing that show the full rpm. Is OK. Throttle back to idle. Take out the antenna on the TX. And start walking. The air frame are in a wood stand. After ca 180-200 meters (590-656 feet). Fail safe and the turbine shut down. Before this we was doing several testing with every thing in the airframe and every thing connected. With the turbine running I always get to the same spot 590-650 Feet and it shut down. After is shut down everything else working fine again. And this was the same thing I feel when I got this thing happened in the air, Fail safe no responding on the stick, after the shut down the control got back.
And look at the facts that I was using to different radio gear, also a different whip. I cannot see the problem are coming from here. Every battery pack is check out.
The only thing that have been the same all the way is the turbine and the “ECU”.
We also making a test with another jet with the same equipment in it. Let the turbine running on idle, take the TX and start walking the way I know very well after 1600 Feet we still not have any problem, I have to turn the TX off to get the airframe to get in fail safe. And the airframe was on the exact same spot as mine use to stand. This was a long story, but I think its been explain how we have performed this test.
I have seen some early design ECU / Pump combinations that emitted RFI all throughout all of the turbine components, actually emitting strong enough interference to shorten even the best radio's range, so it was useless. The cure was to Trap all of the RF being created by the poor ECU / Pump design with very a carefully designed RF shielding system.
Actually, a friend here in Denver produced such a devise he calls it the Rat Tarp. It works very well and was designed for the early Jet Cat turbine systems. Jet Cat has since solved its RFI problems several years ago. But I can tell you the Rat Trap is very effective.
Trapping stray RF emissions is not something the light of heart should try. Jerry found out if you don't totally shield & trap all turbine components, which includes all cables running to and from the turbine, proper grounding of all electrical wiring, batteries, valves, pump etc., etc. the RF gremlins just pop out somewhere else.
So Roy, from what you have told us your problem sounds like it is mostly centered around your turbine components, possibly one that has a slight short to your turbines battery wiring system. Find out if this is a known type of problem (SimJet), they may have a quick fix ready for you.
Note: The range check you described has some flaws, one being you shouldn't be carrying the Receiver or even be near the receiver antenna. Carry the transmitter and have a friend with a cell phone (cell phones don't seem to effect our RF links) or a good walkie-talkie for communication. Remember you can do the range check with the transmitter antenna removed the Baseline number you should achieve if you've got a good RF link is 300 feet. Anything less than 225 feet with means your transmitter / receiver link is not tuned properly.
Using the Rat Trap Jerry's and my range is slightly more than 300 feet turbine running at full power, or 1/2 mile ant. fully extended. Full power is the worst RFI condition. Actually the startup sequence is even worse in the autostart turbines, but as the startup sequence ends it then is full power or fuel pump running at high speed.
Good luck,
Lee H. DeMary
AMA 36099
See PIC of a Rat Trap installation in my BobCat the finished Blue anodized unit, and Jerry's proto-type in his Bandit.
10-26-2004 | 12:59 AM
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From: Kristiansand, NORWAY
RE: Radio Range Trouble.
Thanks so long.
I know it was not the optimal way to do a range test, but it give some clue.
And this turbine and ECU is a earlier design from the year 2000.
And I waiting on a reply from Sim Jet Denmark.If they have any clue.
But now I have to hit the road and make some money so I still can enjoy this great hobby after all.So I will not be on the Internet before late Friday.My mobile connection is to slow to make anything else than E-Mail.
So long
Roy Jimmy
I know it was not the optimal way to do a range test, but it give some clue.
And this turbine and ECU is a earlier design from the year 2000.
And I waiting on a reply from Sim Jet Denmark.If they have any clue.
But now I have to hit the road and make some money so I still can enjoy this great hobby after all.So I will not be on the Internet before late Friday.My mobile connection is to slow to make anything else than E-Mail.
So long
Roy Jimmy
11-07-2004 | 12:44 PM
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From: Kristiansand, NORWAY
RE: Radio Range Trouble.
Hey.
My battle is still on. After a rebuilding and move the fuel pump back beside the turbine, move all the cable to the turbine on one side and all to the receiver on the other side. But in the front this airframe is narrow.Change the ECU battery pack.
Put on noise ferrite ring on the throttle cable and on the cable from the ECU battery pack and the two longest servo cable. And put on 3 noise condenser on the fuel pump.
I also get a reply from the factory that make this turbine, and the advice was change ECU battery, and check out the cockpit panel after any loose connection. And look after a burn out LED light.
And this ECU and turbine is well know to be very good protection to any RF-Noise.
So today was the day to check this out. It's a new field but I been use this place for many years.
Start up go trough the routine with the full speed back to idle. And with fully extended antenna start walking with a cell phone in my hand and a friend with cell phone in the other end. After ca 200-250 Meter(650 Feet).Everything is still running smooth,start to speed up the turbine, when I reach about half speed, It went in fail safe and shut down, and after yes everything work well again.
So now what ??????.
My battle is still on. After a rebuilding and move the fuel pump back beside the turbine, move all the cable to the turbine on one side and all to the receiver on the other side. But in the front this airframe is narrow.Change the ECU battery pack.
Put on noise ferrite ring on the throttle cable and on the cable from the ECU battery pack and the two longest servo cable. And put on 3 noise condenser on the fuel pump.
I also get a reply from the factory that make this turbine, and the advice was change ECU battery, and check out the cockpit panel after any loose connection. And look after a burn out LED light.
And this ECU and turbine is well know to be very good protection to any RF-Noise.
So today was the day to check this out. It's a new field but I been use this place for many years.
Start up go trough the routine with the full speed back to idle. And with fully extended antenna start walking with a cell phone in my hand and a friend with cell phone in the other end. After ca 200-250 Meter(650 Feet).Everything is still running smooth,start to speed up the turbine, when I reach about half speed, It went in fail safe and shut down, and after yes everything work well again.
So now what ??????.
11-07-2004 | 01:22 PM
#20
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From: Littleton,
CO
RE: Radio Range Trouble.
ORIGINAL: Roy Jimmy
Hey.
My battle is still on. After a rebuilding and move the fuel pump back beside the turbine, move all the cable to the turbine on one side and all to the receiver on the other side. But in the front this airframe is narrow.Change the ECU battery pack.
Put on noise ferrite ring on the throttle cable and on the cable from the ECU battery pack and the two longest servo cable. And put on 3 noise condenser on the fuel pump.
I also get a reply from the factory that make this turbine, and the advice was change ECU battery, and check out the cockpit panel after any loose connection. And look after a burn out LED light.
And this ECU and turbine is well know to be very good protection to any RF-Noise.
So today was the day to check this out. It's a new field but I been use this place for many years.
Start up go trough the routine with the full speed back to idle. And with fully extended antenna start walking with a cell phone in my hand and a friend with cell phone in the other end. After ca 200-250 Meter(650 Feet).Everything is still running smooth,start to speed up the turbine, when I reach about half speed, It went in fail safe and shut down, and after yes everything work well again.
So now what ??????.
Hey.
My battle is still on. After a rebuilding and move the fuel pump back beside the turbine, move all the cable to the turbine on one side and all to the receiver on the other side. But in the front this airframe is narrow.Change the ECU battery pack.
Put on noise ferrite ring on the throttle cable and on the cable from the ECU battery pack and the two longest servo cable. And put on 3 noise condenser on the fuel pump.
I also get a reply from the factory that make this turbine, and the advice was change ECU battery, and check out the cockpit panel after any loose connection. And look after a burn out LED light.
And this ECU and turbine is well know to be very good protection to any RF-Noise.
So today was the day to check this out. It's a new field but I been use this place for many years.
Start up go trough the routine with the full speed back to idle. And with fully extended antenna start walking with a cell phone in my hand and a friend with cell phone in the other end. After ca 200-250 Meter(650 Feet).Everything is still running smooth,start to speed up the turbine, when I reach about half speed, It went in fail safe and shut down, and after yes everything work well again.
So now what ??????.
Same place same everything... what is your range with the ECU unplugged? It should be more than 1800 feet! If that is the case..... we can assume you have a good an RF link (Radio). Your description of symptoms is very similar to the extremely bad case of RFI (radio frequency interference) being generated by your turbine components.
If you like I can hook you up with the fello who designed the Rat Trap.. and for less than you might think his RF trap should fix the problem once and for all. The trap was designed for the JetCat turbine and its systems but I think it could be slightly modified to work with the Simjet turbine.
Just e-mail me at [email protected]
Lee
See pictured below the Rat Trap as installed in my BVM BobCat
11-07-2004 | 01:45 PM
#21
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From: Kristiansand, NORWAY
RE: Radio Range Trouble.
No Its was not on the same field this time,but I think thats not the Question.With the Turbine off but with the Cockpit panel one,thats mean the power supply to the ecu is on,in this stage I can walk for ever and still have a good radio signal to the airframe.Thats mean I have not walk out of the range.A E-Mail its on the way.
11-07-2004 | 02:44 PM
#22
RE: Radio Range Trouble.
Roy Jimmy
Got to say it sounds like the ECU.
You mentioned it was an older one, i have seen this before on earlier SimJet ECU's Saw it in Belgium as well as the UK.
Try Larrs and if no joy, PM me i have a contact you can speak to about using a different ECU.
Got to say it sounds like the ECU.
You mentioned it was an older one, i have seen this before on earlier SimJet ECU's Saw it in Belgium as well as the UK.
Try Larrs and if no joy, PM me i have a contact you can speak to about using a different ECU.
11-07-2004 | 02:58 PM
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From: Kristiansand, NORWAY
RE: Radio Range Trouble.
At last.I am not the only one.
Yes it is a older one,not the fadec what they are using now.I am in contact with Lars so I will bring this up.If not I will came back on your offer (thanks)
The funny thing is that in Norway Sim Jet is the leading turbine in use,short distance to the factory and they understand Norwegian,more easy that way.But now one have this problem earlier.And second time this problem came up we was 12 Turbine Pilot on the field..........
Yes it is a older one,not the fadec what they are using now.I am in contact with Lars so I will bring this up.If not I will came back on your offer (thanks)
The funny thing is that in Norway Sim Jet is the leading turbine in use,short distance to the factory and they understand Norwegian,more easy that way.But now one have this problem earlier.And second time this problem came up we was 12 Turbine Pilot on the field..........
11-08-2004 | 10:57 AM
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RE: Radio Range Trouble.
Hi Roy Jimmy.
I had some trouble with my twin F-15 some years ago. And this was solved by wiring a connection to the negative on the pump pack, to the turbine.
The ducts got the same wiring, but just a short one to one screw holding the nozzle.
All long servo-leads got the same treatment. Leave the minus on the RC, DO NOT mess with this!
I used thin alu-tape to shield the leads. Connection on the servoleads was made near the pump-pack, but the clou is to have just one piont of connection for each object beeing earthed.
This solved it all for me back then, but the best is not to cure a syndrom, but instead get rid of the cause...(Yes, you have tried almost everything till now) Mine was also Fadecs as well, but I doubt your Fadec is the reason.
I think you have a serious interference problem due to the setup.
Also be sure not to have any alu close to the aerial wip! The alu sure will consume the most of the received signals.
If you do like i did, your setup will be like there was no longer servoleads than five cm each, depending of how thouroughly (how much in lenght) you have taped the servoleads) Interference will not enter your system due to the equal electrical potensial in all metal parts as this is absorbed by the negative... Think of it as a vacuume.
Remember, you must use the MINUS on the pump pack, no other!
I had manually start ECU`s, and had no trouble about voltage the engine with the pump pack.
It might be a different matter with a autostart..
Hope you a closer to a solution.
Regards
Gudmund
I had some trouble with my twin F-15 some years ago. And this was solved by wiring a connection to the negative on the pump pack, to the turbine.
The ducts got the same wiring, but just a short one to one screw holding the nozzle.
All long servo-leads got the same treatment. Leave the minus on the RC, DO NOT mess with this!
I used thin alu-tape to shield the leads. Connection on the servoleads was made near the pump-pack, but the clou is to have just one piont of connection for each object beeing earthed.
This solved it all for me back then, but the best is not to cure a syndrom, but instead get rid of the cause...(Yes, you have tried almost everything till now) Mine was also Fadecs as well, but I doubt your Fadec is the reason.
I think you have a serious interference problem due to the setup.
Also be sure not to have any alu close to the aerial wip! The alu sure will consume the most of the received signals.
If you do like i did, your setup will be like there was no longer servoleads than five cm each, depending of how thouroughly (how much in lenght) you have taped the servoleads) Interference will not enter your system due to the equal electrical potensial in all metal parts as this is absorbed by the negative... Think of it as a vacuume.
Remember, you must use the MINUS on the pump pack, no other!
I had manually start ECU`s, and had no trouble about voltage the engine with the pump pack.
It might be a different matter with a autostart..
Hope you a closer to a solution.
Regards
Gudmund
