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Author Topic: 2.4ghz Radio?  (Read 10373 times)

Jay28

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2.4ghz Radio?
« on: September 12, 2009, 12:52:59 PM »

Hi Guys,

I've heard it is possible to use a 2.4ghz radio with a 2.4ghz vtx by making sure the vtx is switch first, so the radio find the unused channels.

Is this true?
As anybody here tried this and if so what were the results?

Thanks

Jay
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simondale

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Re: 2.4ghz Radio?
« Reply #1 on: September 13, 2009, 03:54:52 AM »

Funnily enough I just posted about this in another thread.  I just said:

Interestingly enough I was recently chatting to Alex Wilder at www.nextgen-rc.co.uk and he told me that he has fitted our 2.4GHz transmitters on several of the Mikrokopters that he has built for people and he has not had a problem with Spektrum RC gear.

The way the Spektrum works is to first scan the airwaves, then it picks two channels that are free and uses them.  So in theory so long as you turn on your video first the Spektrum should detect it and then avoid it.  (Futaba FAAST works completely differently (frequency hopping spread spectrum) and is definitely not compatible).

By all means give Alex an email to ask him yourself but that's what he told me.
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Jay28

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Re: 2.4ghz Radio?
« Reply #2 on: September 13, 2009, 01:53:21 PM »

It was Spektrum I was refering to, I should have made that clear in my orginal post. Your post confirms what I was thinking, so I take your word for it.

I was using a 35mhz HI-Tec optic 6 which has failed on me twice with two seperate rx's. Once with full FPV equipment onboard and the second during a test flight with just an EzOSD on board. I wondered if I have a dodgy tx (it's only a couple of months old) or if the EzOSD could be causing interferance? Has there been any reports of interference caused by the EzOSD?

Anyway, I've just purchased a 35mhz futaba 6EX and will give this a go, I guess futaba is the way to go if I want to get into headtracking later on. If I have any problems this, I'll give my Spektrum radio a go and report back.
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simondale

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Re: 2.4ghz Radio?
« Reply #3 on: September 18, 2009, 01:39:36 PM »

I've not heard of any problems with interference from the EzOSD and I would doubt that that is the culprit.  To use his own words Sander Ssassen, who designed the EzOSD, is incredibly anal about his designs not emitting any harmful EMI. 

Regarding head tracking a Futaba is definitely the way forward however in theory you need an 7C or above.  That said I know of one guy who does use a TrackR2 with a 6EX.  Daniel from Bournemouth - I don't think he's a member but when you get a TrackR2 remind me and I can email him on your behalf.  I remember it took a while for him to get it going and there was some trick involving leaving everything for a few seconds before progressing to the next stage.

Cheers

Simon
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Jay28

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Re: 2.4ghz Radio?
« Reply #4 on: September 18, 2009, 04:41:15 PM »

I tested the Futaba radio and that also failed a range test too. It seems strange that I would be that unlucky to buy a new hitec and a new futaba radio from differnent vendors and they would both be faulty? As you say it's unlikely that the EZOSD would be the cause, I've not seen any other posts regarding interference with the EZOSD. It's a mystery at the moment? I will re-test both radio's with a different set up when I get a chance and post the results.

I did test my Spektum 2.4Ghz radio, I can confirm that there were no problems at all. I haven't tried powering up the RX & TX before the VTX so I don't know how much of a problem this would be but it's not something I plan on doing.

Thanks for offering to help with the TrackR2, I don't think I'll be getting one just yet, I'm happy for now using just pan on the rudder channel, I want to get a patch antena then a video recorder, headtracking with come after.

Can you tell me why you normally need 7ch for the TrackR2? My FPV bird is a 3ch ES, althought I do have a 4ch ES which I may borrow the modded wings of at some point. Either way I will have 2 or 3ch's free. I would have thought the TrackR2 requires 2 ch's, 1 for pan & 1 for tilt, is this not correct?
« Last Edit: September 18, 2009, 09:24:40 PM by Jay28 »
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Jay28

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Re: 2.4ghz Radio?
« Reply #5 on: September 18, 2009, 09:14:13 PM »

My Spektrum radio failed a range test tonight, this was both with & without video gear aboard, thats now 3 different radios, i'm really confused. ??? It's looking more & more likely that the OzOSD is the problem, it's burried deep inside the fuselage of my easystar so it's not going to be a quick job to get it out and testing without it. It looks like it's going to be great conditions for flying tomorrow and it now looks like i'm going to miss it.  >:(

Anybody got any suggestions? At the moment I'm stumpted. ???
« Last Edit: September 18, 2009, 09:25:17 PM by Jay28 »
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Jay28

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Re: 2.4ghz Radio?
« Reply #6 on: September 20, 2009, 05:57:27 PM »

After further testing with a spektrum 2.4ghz radio, I have discovered the radio link seems to work fine if the rx/tx are switched on after the VTX. However I have also discovered that interference is caused to the VRX by the TX. Rolling lines occur on screen, so my final conclusion is it's not worth trying to use both.

I still have range issues with all radio's which i'm am now convinced are cause by either the EzOSD or it's current sensor but thats another topic.
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simondale

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Re: 2.4ghz Radio?
« Reply #7 on: September 20, 2009, 10:51:21 PM »

Can you tell me why you normally need 7ch for the TrackR2? My FPV bird is a 3ch ES, althought I do have a 4ch ES which I may borrow the modded wings of at some point. Either way I will have 2 or 3ch's free. I would have thought the TrackR2 requires 2 ch's, 1 for pan & 1 for tilt, is this not correct?

Hi Jay,

Its not about the channels its just that the more channels the Tx has the more sophisticated the built in computer system is.  In theory the FF7 is the lowest model in the range that has selective channel assignment.  You need that feature to allow you to set certain channels to the local sticks, and certain channels to the buddy port (normal trainer student configuration would be all channels to the buddy port when the trainer switch is held or all channels to local sticks when the trainer switch is left alone).

However, like I said, I have had at least one customer tell me that they got the TrackR2 to work with a 6EX by using a little trick.

Regarding the EzOSD please keep me posted.  I've never heard of a problem but the only way to be sure is by removing each item one at a time and doing range checks.

Cheers

Simon
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Jay28

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Re: 2.4ghz Radio?
« Reply #8 on: September 21, 2009, 05:15:22 PM »

Thanks for the info Simon, that makes sense.

With regards to the EzOSD, i've started a discussion here regarding the problem:-
http://www.rcgroups.com/forums/showthread.php?t=1114759#post13165405
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simondale

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Re: 2.4ghz Radio?
« Reply #9 on: September 22, 2009, 04:00:09 PM »

Looks like the other thread will sort you out.  If Sander (the designer of the EzOSD) can't help you then nobody can!
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Doofer

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Re: 2.4ghz Radio?
« Reply #10 on: September 22, 2009, 04:39:17 PM »

Even if some 2.4GHz R/C gear seems to work while a 2.4GHz video transmitter is switched on right next to it, I'd avoid this scenario. The danger of the receiver input stages being flooded by a (comparatively deafening) local transmitter on a nearby frequency will only increase the further away your craft gets, especially when reception is sub-optimal for other reasons (trees etc.).

The designers won't have considered this scenario - it's nuts. Why expect to reliably receive a signal from one transmitter e.g. 100m away, whilst nearby e.g. <10cm away, another transmitter is broadcasting a signal at a frequency just a few percent different, at a signal strength under these circumstances 100 million times greater?

Mind you, I recommend 2.4GHz R/C gear to everyone I meet, in the interests of avoiding R/C  interference*.


(*Because I use 35MHz.... ;)  )
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simondale

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Re: 2.4ghz Radio?
« Reply #11 on: September 23, 2009, 09:00:26 PM »

I agree with you Doofer.  I shall go back to advising everyone that 2.4GHz simply isn't compatible.

Quote
Mind you, I recommend 2.4GHz R/C gear to everyone I meet, in the interests of avoiding R/C  interference*.


(*Because I use 35MHz.... Wink  )

I like it!
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Crowstooth

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Re: 2.4ghz Radio?
« Reply #12 on: December 01, 2009, 01:12:22 PM »

Quote
However, like I said, I have had at least one customer tell me that they got the TrackR2 to work with a 6EX by using a little trick.
I have a Futaba T6EXA which will be my VPV tranny and I'd dearly like to know that little trick.
Crowstooth.
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simondale

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Re: 2.4ghz Radio?
« Reply #13 on: December 02, 2009, 01:50:05 PM »

Crowstooth - I'll PM you the guy's email address and you can ask him.
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