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Author Topic: 2.4GHz FHSS: Fly Sky interferes with RadioLink?  (Read 13819 times)

TimCo

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Re: 2.4GHz FHSS: Fly Sky interferes with RadioLink?
« Reply #25 on: March 27, 2012, 09:57:41 pm »

Ah, Westport Lake! I went there last Sunday (25 March 2012) with Fly-Sky-equipped model, among the throng of parents, toddlers, dogs, swans, canada-geese and ducks, and didn't interfere with any of those! Later, two modellers arrived, both with Spektrum gear, and went straight onto the water without any interference worries, or queries about my RC. No problems were noticed with the Fly Sky. I took the RadioLink set with me in the car but there didn't seem any point in testing it again against Spektrum.

I was rather hoping a few other Mayhem people with the T4EU Tx and R7EH Rx combination might try one or other of the tests that I, and dodgy geezer, have done (Range-check, FlySky, WiFi, Bluetooth, above).
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john44

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Re: 2.4GHz FHSS: Fly Sky interferes with RadioLink?
« Reply #26 on: March 27, 2012, 10:16:54 pm »

Hi TimCo, you will need to go to Westport on a Wed.morning or Sunday morning. There was about 20 boaters there on Sunday.
8 Yachting and the rest power sailing off the jetty.
We tend to get there around 9 - 9-30am to get a parking space and go at about 12.

The tx,s I know for a fact that are in use at that time are , Planet, Radio-link, Spectrum,Futaba 2.4 sets, I could,ny say about Fly-sky

Hope to see you there.

john44

member of the potteries model boat club.
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dodgy geezer

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Re: 2.4GHz FHSS: Fly Sky interferes with RadioLink?
« Reply #27 on: March 27, 2012, 11:59:22 pm »

I would guess that a test under those conditions would be quite enough to show whether your Radiolink was faulty or not - and then get it replaced....
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TimCo

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Re: 2.4GHz FHSS: Fly Sky interferes with RadioLink?
« Reply #28 on: April 04, 2012, 05:38:14 pm »

Thank you for all these helpful suggestions but I felt that too much time had passed since I first identified the interference problem only 1 hour after receipt.  I have returned the RadioLink Tx and two Rx's to the vendor, with the following suggestions, inferred from the above tests, which I hope they will find helpful, rather than irritating:

" (a) The transmitter is low on RF output. This is possible even though the range is as good, or better than, that of the Fly Sky set. If, however, one could, say, double the Tx output, would this not merely make an incremental change to the relative distances at which servos would start to glitch, etc?

(b) Both receivers are faulty. This would be very unlucky, and, because of the range check result, unlikely.

(c) The receiver design is at fault. From what I have read, spurious servo movement and ESC operation, like was often seen in 27MHz systems, should not be possible with 2.4GHz, even when there is interference.

(d) The RadioLink FHSS system is not good enough.

(e) The Fly Sky “Automatic Frequency Hopping Digital System” (AFHDS) somehow “confounds” the RadioLink FHSS, such that it is the only RC brand that cannot be operated nearby. This seems unlikely, in the light of the RadioLink’s response to interference from other sources.

I am disappointed by all this because there are some features of the RadioLink that I prefer over those on the Fly Sky: the joysticks, lanyard-attachment and receiver antenna (easier to install)......"

After sending the stuff back, I thought of another possibility:

(f) The transmitter has a fault, such that it does not correctly identify the free channels on which it should choose to transmit, i.e. like (d), above, but owing to a manufacturing, rather than design, fault.

I will let you know what comes of this, and, for the Westport-Lakers, there might be some familiar scenes videoed from the model, at  http://www.youtube.com/user/TimCo158?ob=0&feature=results_main

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dodgy geezer

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Re: 2.4GHz FHSS: Fly Sky interferes with RadioLink?
« Reply #29 on: April 04, 2012, 06:04:41 pm »

Umm... given the lack of other reports of this incompatibility, I would suspect an individual fault of some kind rather than a design problem.

One other possibility is that the fault is in the FlySky, and that it is incorrectly radiating a jamming signal which specifically affects Radiolinks. If I hadn't isolated the faulty unit without doubt, I would have been inclined to send everything back, so that I could be sure that the failure could be duplicated...
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Netleyned

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Re: 2.4GHz FHSS: Fly Sky interferes with RadioLink?
« Reply #30 on: April 04, 2012, 06:37:15 pm »

We have a member with 2.4 camera on his tug sending a signal back to a monitor.
Being a fixed frequency it suffers from interference from most 2.4 gear but the flysky of one member just about blanks the screen

Ned
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Smooth seas never made skilful sailors
Up Spirits  Stand fast the Holy Ghost.
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dodgy geezer

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Re: 2.4GHz FHSS: Fly Sky interferes with RadioLink?
« Reply #31 on: April 04, 2012, 08:03:46 pm »

Hmm... I think it would be interesting to see what that FlySky does when put near a set of other radios....
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Netleyned

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Re: 2.4GHz FHSS: Fly Sky interferes with RadioLink?
« Reply #32 on: April 04, 2012, 09:12:20 pm »

We have quite a lot of 2.4 gear at the lakeside most days.
No problems have been reported but if a model is in the middle of the lake
and has a momentary glitch it would probably be missed.
I normally run a T4u as do a couple of others with no problems
I also run a Spektrum DX6i DSMX and we also have a few Planet 5's and the odd
Futaba.
As far as I am aware no-one has had a problem when the Flysky is on.
We all stand in an area about 15 x 5 metres when running our boats.
Ned
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Smooth seas never made skilful sailors
Up Spirits  Stand fast the Holy Ghost.
http://www.cleethorpesmba.co.uk/

john44

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Re: 2.4GHz FHSS: Fly Sky interferes with RadioLink?
« Reply #33 on: April 05, 2012, 10:06:35 am »

Hi TimCo, I recognize you now from your Vid. We had a chat down on the jetty about the Potteries Model Boat Club
Sorry you could not resolve your Radio problem without having to send it back.
Hope to see you down the lake again sometime.

john
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dodgy geezer

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Re: 2.4GHz FHSS: Fly Sky interferes with RadioLink?
« Reply #34 on: April 05, 2012, 10:16:02 am »


...As far as I am aware no-one has had a problem when the Flysky is on....


I was concerned that TimCo might have a rogue FlySky that causes interference to Radiolinks. But he did report that he got glitching from other sources as well...  Still, I would be happier to isolate that Radiolink as faulty if he could have tested other Radiolinks against his specific FlySky....
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john44

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Re: 2.4GHz FHSS: Fly Sky interferes with RadioLink?
« Reply #35 on: April 06, 2012, 08:35:43 pm »

I was concerned that TimCo might have a rogue FlySky that causes interference to Radiolinks. But he did report that he got glitching from other sources as well...  Still, I would be happier to isolate that Radiolink as faulty if he could have tested other Radiolinks against his specific FlySky....

Hi Netleyned, It was a Radiolink system TimCo had a problem with. Not a FlySky system.

john
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dodgy geezer

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Re: 2.4GHz FHSS: Fly Sky interferes with RadioLink?
« Reply #36 on: April 06, 2012, 10:48:15 pm »

Hi Netleyned, It was a Radiolink system TimCo had a problem with. Not a FlySky system.

As I understand it, he had considerable interference on his RadioLink when he operated the FlySky close to it. He also got glitching on some other occasions, but the big problem he noticed was 'incompatibility' between the RadioLink and the Flysky.

It seems likely that the problem is with the RadioLink. But it is still just possible that the problem is that the FlySky is wrong in some way and interfering with the RadioLink - I just wanted to test the FlySky with another RadioLink to confirm that this was not the problem. If that FlySky interferes with all the RadioLinks around, and other FlySkys don't, then it could be that specific FlySky that needs changing...
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