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Old Jul 14, 2011, 08:57 PM
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Lafayette, Louisiana
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Help!
Futaba 9C BAD Range Test with Video

here is my Futaba 9CHP Super. It wont range check unless this is normal. Please Help.

http://www.youtube.com/watch?v=PQ-U45sbppU
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Old Jul 15, 2011, 12:14 AM
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"It wont range check unless this is normal." What are you trying to say?

What is your problem?

The best way to range check is fly your plane. You will find out.
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Old Jul 15, 2011, 12:25 AM
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im saying its not range checking. arnt you supose to be able to walk away like 300 ft antana down. unless this is normal means by the video if that is normal distance for what you see than it is fine. I am having radio hits in air that i never had before.
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Old Jul 15, 2011, 12:47 AM
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With antenna down, your signal never reach 300 feet. Normal range check is around 20 feet.

Is frequency control well managed at your flying field? How many people usually fly at the same time?

Put channel flag on your TX to show your frequency to other people. Put same frequency flag on frequency control post. Ask other flyers what channels they are using. Announce your frequency to other flyers.

If you still get interference after all these precaution. change your channel.

If you still get hit, send your radio to Futaba for check up.

What kind of receiver are you using? Don't use single conversion receiver.
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Old Jul 15, 2011, 02:17 AM
ATK
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300ft is not a normal range and neither is 20. More like 100ft.

If you're doing the range check correctly then I would say that this check is a fail. However check your manual. Some radios require the last innermost section of the antenna to be extended during range check. And don't point the radio anrenna straight at the model. That is the dead zone. Don't do that when range checking OR flying.

And NEVER range check by flying. That's just CRAZY and I hope the other poster was just making a joke.
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Old Jul 15, 2011, 05:28 AM
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If its not too much trouble either, disconnect 2 motor wires from the esc so it wont fly away with glitches.. Although imho on a plane that nice you should have a PCM1024 receiver or atleast a quality receiver with good filtering so that glitches like that shouldnt be happening at all. And as was previously stated, there is no good reason to use single conversion receivers anymore.

You can also do an extended antenna range check by putting the 9CAPS in servo test mode (with the motor wires disconnected) and walk away with the plane.
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Old Jul 15, 2011, 10:29 AM
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yea, I didnt think John Kim was correct. 20 ft is dead wrong and flying to test defeats the purpose of range testing to begin with. the goal is to not crash the plane. I followed the futaba range guide. I know about the pointing directly at it i messed up the vid by trying to get both the Tx and the plane in the screen at the same time but it does the same thing no matter what direction i face. I fly alone no r/c field just my own lot. I have been flying here for years maybe over a decade with no problems. the rec in the plane is new. Hitec single conversion. oh well.

My other Rx i found didnt do it. A Castle berg7p.

I was reading on the these... can you tell me if they are any good. They read up very well and better than most ive found.

Corona RP6D1 Synthesized Full Range DSP Receiver on a 72mhz Futaba Tx


http://www.bphobbies.com/view.asp?id...5&pid=E0835795
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Old Jul 15, 2011, 02:44 PM
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Some negatives on the Corona, they supposedly often times have deadbands in the middle, and poor servo resolution. And the quality is hit or miss, they are popular with the FPV crowd since they are very sensitive.

As long as you mentioned BP hobbies, I would pick this: http://www.bphobbies.com/view.asp?id...93&pid=W152968

You really cant do better than that for the money, its a quality receiver.
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Old Jul 15, 2011, 03:32 PM
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Quote:
Originally Posted by pach View Post
some negatives on the corona, they supposedly often times have deadbands in the middle, and poor servo resolution. And the quality is hit or miss, they are popular with the fpv crowd since they are very sensitive.

As long as you mentioned bp hobbies, i would pick this: http://www.bphobbies.com/view.asp?id...93&pid=w152968

you really cant do better than that for the money, its a quality receiver.

fpv ?
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Old Jul 15, 2011, 04:02 PM
ATK
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First Person View = flying with the aid of a live video feed from the plane
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Old Jul 15, 2011, 05:24 PM
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Quote:
Originally Posted by jonathan7x70 View Post
here is my Futaba 9CHP Super. It wont range check unless this is normal. Please Help.

This forum does not suport simple copy/paste inc url, please refer to sub section:

"Receiver Operating Range, Range Test & Range Problem Solving"
includes:
Range of Transmitter and Receiver
Range - Increase Range of your FPV equipment
Range Test - Futaba answers.
Range Test - JR answers. (If defaults to Horizon, check article ID 1079
Range Test - Comparative Range Test data on multiple systems
Range test - TX with Rubber Duck Antenna
Range Test - Check and Resolution of Range Failure
Receiver - Operating Range
Receiver - Operating Range - Full vs ParkFlyer vs Backyard.

See also sub Section "Glitches & Jitter in Receiver, Servo & ESC - causes and cures " under
"Radio Systems, Accessories, Alterations and FAQ." at:
Alan's Hobby, Model & RC FAQ Web Links

Alan T.
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Old Jul 15, 2011, 05:24 PM
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ok... but why? Wouldnt you want the best Rx for that kind especially... they get far away dont they.
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Old Jul 15, 2011, 11:35 PM
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Quote:
Originally Posted by jonathan7x70 View Post
yea, I didnt think John Kim was correct. 20 ft is dead wrong
You misconceived range check. Range checking does not mean checking maximum range. Range checking is to make sure radio is properly working and safe to fly. If no problem shows up at 20 - 30 feet, it means radio is trouble free to fly.

Of course, if you have time and energy to walk 300 steps each time you range check, it is your choice. No one will stop you.

If you are concerned about range, don't use single conversion receiver. Use dual conversion. It employs two RF amplifier stages, so more sensitive.
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Old Jul 16, 2011, 07:09 AM
ATK
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@john You're sure you're not mixing up feet and yards now? 20ft is less than two car lengths. You're practically on top of the model at that distance.
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Old Aug 22, 2011, 10:57 AM
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I had that kind of a problem with an 8U. I cleaned the pins on the rf module and tightened the antenna screw. That fixed mine.
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