EzOSD - Radio Interference?

[Jay28]

Hi,

Has anybody experienced any radio interference whilst using the EzOSD or its current sensor? I find if I turn on my EzOSD I only have between 100-200 meters range depending on which radio I am using.

I have tested using a 35mhz hitec optic 6, a 35mhz futaba 6ex & a 2.4ghz Spekrum DX6i.

Whilst conducting a range tests my radios fail between 2-10 metres, yet all work fine with the EzOSD disconnected.

Any advice is appreciated.

Jay.

[ssassen]

The EzOSD has a RF signature which has all components in the 35, 40, 72MHz bands removed, the highest harmonic you'll see is at 118MHz, above that it doesn't radiate. The net RF and EM field residu is buried well in the noisefloor on my spectrum analyzer with -140dB of sensitivity.

What is likely happening is that you either have it wired wrong, or you're bundling all wires together, which should be avoided at all cost. Also the Rx should be located as far away from anything else electronic as possible.

I'll only be able to help you with clear pictures of your setup in this case though, so just a description will simply *not* suffice.

Cheers,

Sander.

[Jay28]

Thanks for the help Sander, I'm unable to provide pictures at the moment as the EzOSD is located inside the fuselage of my easystar and it will take be a while to get it all apart but i'll post some pictures ASAP.

I doubt the EzOSD is wired up wrong as I purchased a plug and play version to go with my camera.

I do have excess wiring so that maybe the problem.

I will rearrange my set up and reduce cabling and see if that works.

Does anybody have any pictures of a FPV easystar set up with a EzOSD? I'm struggling to make the most of the space.

Thanks

Jay.

[ssassen]

Jay,

I'd put the EzOSD in the nose, without removing any foam, the GPS will 'see' through the foam just fine and in this way the sensitive GPS is furthest away from the rest of the equipment. And yes, please do a proper job with the wiring, that'll certainly help.

Cheers,

Sander.

[Jay28]

Jay,

I'd put the EzOSD in the nose, without removing any foam, the GPS will 'see' through the foam just fine and in this way the sensitive GPS is furthest away from the rest of the equipment. And yes, please do a proper job with the wiring, that'll certainly help.

Cheers,

Sander.

Thanks Sander,

I currently have the current sensor in the left section of the fuse, the EzOSD on the right. The rx & esc are on the left in the canopy section and the lipos on the right. The power cables to the current sensor have to pass the rx so this could well be the problem.

I went for this set up so I would keep the weight of the EzOSD/Sensor close to the COG and also so it is well protected. If I move the EzOSD & Sensor to the nose am I going to have a very nose heavy aircraft?

[ssassen]

Jay,

Nah, won't be nose heavy, just move the LiPo back a little further (or actually, the heaviest part (= LiPo) should be on the COG). As for your configuration, you really shouldn't put the ESC and the Rx side by side, that's asking for trouble. The ESC is by far the noisiest part in your plane, putting it next to your Rx is a sure recipe for issues.

If I have time tomorrow I'll snag a few shots of my Ez, so you have an idea what you could do with your build.

Cheers,

Sander.

[Jay28]

Thanks Sander,

I'm not going to have time to do the work until weds evening but would be good to see some pics before then if you get a chance.

Cheers

Jay.

[Jay28]

I've now re-arranged by set up but it has made no difference. My radio(s) fail a range test at with the EzOSD connected and passes with flying colours with it disconnected.

here is are pictures of my setup.

Any suggestions?

[FPV-UK]

I've now re-arranged by set up but it has made no difference. My radio(s) fail a range test at with the EzOSD connected and passes with flying colours with it disconnected.

here is are pictures of my setup.

Any suggestions?

Hi Jay,

This isn't an aswer to your question and wouldn't make any difference to RC range but I would say that you've got the video Tx very close to the back of the camera. We provide the Tx on a pigtail rather than attached to the back of the camera/ PSU because they don't like being right next to each other.

You might see interference on your video if you have it stuck right next to the PSU as pictured.

Hopefully Sander will have an idea about the EzOSD/ RC range issue.

Cheers

Simon

[Jay28]

Hi Jay,

This isn't an aswer to your question and wouldn't make any difference to RC range but I would say that you've got the video Tx very close to the back of the camera. We provide the Tx on a pigtail rather than attached to the back of the camera/ PSU because they don't like being right next to each other.

You might see interference on your video if you have it stuck right next to the PSU as pictured.

Hopefully Sander will have an idea about the EzOSD/ RC range issue.

Cheers

Simon

Hi Simon,

Thats just a temp position for the vtx whilst testing the EzOSD and moving the camera section around, it's normal home is attached to the fuse behind the camera/psu, as you'ld expect. Although I've not notice any interference from the PSU whilst testing.

Hopefully Sander can help with the EzOSD, otherwise I might have to send it back to you to check out.

by the way the servo stretcher would normally sit further to the left than pictured.

Thanks

Jay.

[ssassen]

Jay,

I don't know what's wrong, the EzOSD doesn't radiate at 35MHz nor at 2.4GHz, I really think this is a combination of things that gets offset by adding the EzOSD.

One thing to try would be to power the EzOSD from the BEC (5V) or a receiver pack (4x AA battery) and leave the sensor out of the plane (don't wire it in), as the sensor is the only part that has a switching regulator. If that's dodgy it might radiate, but in the 100s of EzOSD produced this would be the first and thus very, very rare.

Also, I gather you're in the UK? In that case I could have a look at what's happening here personally if you're willing to ship it to me directly. I can diagnose it and ship the EzOSD out to you the same day if needed.

Cheers,

Sander.

[Jay28]

Hi Sander,

Thanks for the help. I'll get a servo extention lead tomorrow and see how easy i think it will be to convert the lead to exclude the sensor, I remember reading how to do this and didn't think it sounded to differcult.

I am in the UK & have no problem shipping the unit to you, although i don't want to waste your time, so i think i continue to play around for a bit longer first.

I've have also been thinking that maybe the Ezosd & senor are offsetting another problem but i'm running out of ideas. if you can think of anything else i should try then please let me know. So far i have rearranged the set up serveral times, tried a different esc, tried 3 different tx/rx's, removed vtx & camera & resoldered all homebrew connections.

All the best,

Jay.