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RX8R Pro Signal Swamping??

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Kim Taylor15/11/2019 11:08:59
314 forum posts
55 photos

I've recently been swapping my planes over to FrSky, using an X9D+SE 2019 with mainly Rx6R's and a single RX8R Pro receivers, all bound in D16 mode.

Up to this point, all has been going well, with no unexpected issues.

Yesterday I put the RX8R Pro in to my WOT4XL which has a petrol motor, which is why I used the Pro rx. Whilst doing the setup, I noticed a number of unexpected signal losses and upon investigating I found that if I get the tx too close (say within 1 metre) of the rx aerials, the rx immediately lost signal, the red l.e.d. flashing, until I moved the tx away when the link was re-established.

I have not been able to do a proper range test due to lack of space, but will obviously do one when I next go to the flying field.

Is this a 'normal' thing to be seeing, bearing in mind that the test conditions are, of course, abnormal regarding the distance between the rx and tx? Or should I be thinking about returning the rx for testing?

I'm a bit jumpy because the reason I have changed to FrSky is that I was getting unexplained control losses on my previous system, resulting in the loss of three models, and I don't want to be repeating that, obviously.

Thanks for looking

Kim

Edited By Kim Taylor on 15/11/2019 11:09:44

Andy Meade15/11/2019 11:12:33
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2771 forum posts
717 photos

Pretty much the same with all of my FRSky receivers and my Horus, especially when running both aerials at the same time. Are you seeing the same on the RX6R's?

Geoff S15/11/2019 11:52:09
3657 forum posts
26 photos

Normal for me too with all my FrSky receivers - mostly X or D types. It happened with my Taranis as well as the Horus. It's nothing to worry about - unless you fly very,very close to yourself that is It can be a bit irritating in the workshop with the constant 'telemetry lost' voice followed almost immediately with 'telemetry regained' but it's not a serious worry.

Geoff

Tim Ballinger15/11/2019 11:59:02
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791 forum posts
287 photos

Kim,

i have a Horus 10 and several RX8R rx. With the Tx within 1m I nearly always get A Telemetry lost message but I am not aware of actually losing signal as the failsafe has never kicked in and I do a fair bit of bench testing within that range. Range test in reduced RF mode has always been as it should be and certainly no range issues in flight in the 2 years I have had the Horus. I only use the internal aerial btw.

Tim

Philip Lewis 315/11/2019 12:00:15
53 forum posts

This is absolutely normal behaviour and nothing to worry about, in range test you should get about 100 metres away before signal critical but in fact have a way yet to go before you would actually lose control.

Tim Ballinger15/11/2019 12:01:28
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791 forum posts
287 photos

Geoff,

I turn the volume right down while bench testing but put up with the hepatic buzz !

Tim

Kim Taylor15/11/2019 13:10:05
314 forum posts
55 photos
Posted by Andy Meade on 15/11/2019 11:12:33:

Pretty much the same with all of my FRSky receivers and my Horus, especially when running both aerials at the same time. Are you seeing the same on the RX6R's?

Thanks to all for the reassurance - I thought it may be normal, but needed to check.

Hi Andy - the answer to your question is no, I haven't noticed any similar issues with the RX6R's. I'll have a go at making it happen this afternoon when I'm in the workshop (or back bedroom, as my missus insists on calling it!!) and I'll report back if it happens.

Thanks again

Kim

Edited By Kim Taylor on 15/11/2019 13:11:03

Kim Taylor15/11/2019 16:12:30
314 forum posts
55 photos
Posted by Kim Taylor on 15/11/2019 13:10:05:
Posted by Andy Meade on 15/11/2019 11:12:33:

Pretty much the same with all of my FRSky receivers and my Horus, especially when running both aerials at the same time. Are you seeing the same on the RX6R's?

Thanks to all for the reassurance - I thought it may be normal, but needed to check.

Hi Andy - the answer to your question is no, I haven't noticed any similar issues with the RX6R's. I'll have a go at making it happen this afternoon when I'm in the workshop (or back bedroom, as my missus insists on calling it!!) and I'll report back if it happens.

Thanks again

Kim

Edited By Kim Taylor on 15/11/2019 13:11:03

As promised, had a play with it this afternoon with the result that I could not get the RX6R's to swamp or drop out despite severe provocation - obviously the design must be different.

Kim

Bob Cotsford15/11/2019 19:13:48
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8544 forum posts
477 photos

Do the RX8Rs have the paddle aerials and the RX6Rs plain coax? That could account for the extra sensitivity of the 8R. I've never quite understood the need for the paddle-blade aerials when most flyers are flying line of sight only.

Brian Dorricott 115/11/2019 19:53:12
102 forum posts
2 photos

I can confirm the above it does the same with QX7 and S6R bit of a worry as I'm just launching my Bixler by hand but it's back on instantly , just swamping its great once it's away .

Kim Taylor15/11/2019 23:09:32
314 forum posts
55 photos
Posted by Bob Cotsford on 15/11/2019 19:13:48:

Do the RX8Rs have the paddle aerials and the RX6Rs plain coax? That could account for the extra sensitivity of the 8R. I've never quite understood the need for the paddle-blade aerials when most flyers are flying line of sight only.

Hi Bob,

The '8 has a kind of moulded sausage at the tip of the aerial, not the paddle type that I've seen pictures of.

The '6's have standard coax cable aerials. And yes, that may be the reason for the difference.

Kim

Trevor Crook16/11/2019 07:53:30
962 forum posts
69 photos

Same with my QX7 and X series rx's, telemetry swamps at close range but healthy RSSI readings at range.

Shame though that FrSky seem to be changing protocol, to one that isn't backward compatible with existing rx's, but that's a different issue!

Mike Blandford16/11/2019 10:25:17
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629 forum posts
25 photos

The new ACCESS capable modules (built in and external) include support for 'X' series receivers (D16 protocol).

If you have older D8 receivers, I've written firmware for them that operates in D16 mode, see here: **LINK**

Mike

Trevor Crook16/11/2019 10:45:21
962 forum posts
69 photos

That's good to know, thanks Mike.

Trevor Crook16/11/2019 10:50:37
962 forum posts
69 photos

That's good to know, thanks Mike.

Bob Cotsford16/11/2019 16:06:41
avatar
8544 forum posts
477 photos
Posted by Kim Taylor on 15/11/2019 23:09:32:
Posted by Bob Cotsford on 15/11/2019 19:13:48:

Do the RX8Rs have the paddle aerials and the RX6Rs plain coax? That could account for the extra sensitivity of the 8R. I've never quite understood the need for the paddle-blade aerials when most flyers are flying line of sight only.

Hi Bob,

The '8 has a kind of moulded sausage at the tip of the aerial, not the paddle type that I've seen pictures of.

The '6's have standard coax cable aerials. And yes, that may be the reason for the difference.

Kim

Those sausages are described as high sensitivity, some form of dipole maybe? That certainly explains the difference in sensitivity leading to more pronounced swamping at close range.

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