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Author Topic: FrSky R9M....868mhz European Frequency.  (Read 5271 times)

Coyote

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Re: FrSky R9M....868mhz European Frequency.
« Reply #60 on: November 03, 2018, 08:20:15 PM »

Well the 868MHz firmware has got a dev release which so far ( first few days ) is getting positive feedback. 

868mhz_*.0329 : Same code as FCC 0329 (MARCH 29), operating in the 868MHz band (tested, works well)
868mhz_*.1102 : Current dev FCC code (NOV 01), operating in the 868MHz band (not yet tested)

These 2 builds are 868MHz only, not Flex, not LBT, and they work with all FrOS versions (1.5, 1.6, Flex or not) and all openTX versions.
Even if you have a Flex-compatible OS on the radio, whatever you set as band, the R9M will always bind and transmit on the 868MHz band.

So basically its got the dynamic power boost option, but its not a Flex version so does not need an OpenTX 2.2.3 nightly flash doing to your radio.

Early testers are reporting that all RSSI in-discrepancies have gone, failsafe drop-outs at close range are fixed.

These are for R9Mini receivers only, the R9MM version is apparently out on Monday. I will ( not through choice ) wait a week or so and see if they have cracked it, then revert my radio back to 2.2.2 Stable and put them on. Not really keen on running nightly builds tbh.
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English Turbines

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Re: FrSky R9M....868mhz European Frequency.
« Reply #61 on: November 03, 2018, 08:29:39 PM »

  Sounds encouraging to me...Im running 2.2.2 myself, what do you think to the 7.5km range claim on only 25mw?

 Then there is the 1280mhz Video question..?....Will it work alongside 868mhz?....what do you think?


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Coyote

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Re: FrSky R9M....868mhz European Frequency.
« Reply #62 on: November 03, 2018, 09:00:01 PM »

Hmmmm the range claim ...... Lets run the numbers and I'll use the True-Mox as the Tx antenna because it would be more relevant for you ........

25mW Moxon to a 1/2 wave dipole gives you a max theoretical range of 4.14km / 2.57miles

So not a chance on those antennas. I would have said yes on 500mW not 25.

So what could it be done on you say ?

200mW 11.72km / 7.28miles
500mW 18.52km / 11.51miles
1 Watt 26.2km / 16.28miles

Of course you could have a tracker with a high gain Rx antenna on it, say a 10 element Yagi and get 13.48km / 8.38miles but that's when its getting expensive to just point an antenna. And just for kicks a 10 element Yagi on 1 Watt will get 85.26km / 52.97miles which is stupid distance :)


I see no problem with 1.2GHz interfering with the R9 link. The problem if any will arise when your very sensitive 1.2GHz receiver is sat next to a transmitter kicking out potentially 1W of power. The remedy for that is to filter what the receiver can see, so a simple notch filter will sort that out. You can make your own if you feel competent or they can be bought for less than a tenner.
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English Turbines

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Re: FrSky R9M....868mhz European Frequency.
« Reply #63 on: November 03, 2018, 09:21:12 PM »

Hmmmm the range claim ...... Lets run the numbers and I'll use the True-Mox as the Tx antenna because it would be more relevant for you ........

25mW Moxon to a 1/2 wave dipole gives you a max theoretical range of 4.14km / 2.57miles

So not a chance on those antennas. I would have said yes on 500mW not 25.

So what could it be done on you say ?

200mW 11.72km / 7.28miles
500mW 18.52km / 11.51miles
1 Watt 26.2km / 16.28miles

Of course you could have a tracker with a high gain Rx antenna on it, say a 10 element Yagi and get 13.48km / 8.38miles but that's when its getting expensive to just point an antenna. And just for kicks a 10 element Yagi on 1 Watt will get 85.26km / 52.97miles which is stupid distance :)


I see no problem with 1.2GHz interfering with the R9 link. The problem if any will arise when your very sensitive 1.2GHz receiver is sat next to a transmitter kicking out potentially 1W of power. The remedy for that is to filter what the receiver can see, so a simple notch filter will sort that out. You can make your own if you feel competent or they can be bought for less than a tenner.


  I have to admit, 7.5kms on just 25mw does sound rather ambitious, be interesting to try it anyway.
 I thought the XM Lite Transmitter was limited to a 100mw ceiling?....that is what is featured in the video. 
    The gain is stated as 5.5db and a 135 degree beam width for the Moxon I assume you have included this in the calculation, not too pointy Im pretty sure hand tracking would be pretty simple with the RSSI in the OSD.

 My 1280mhz video receiver and Patch is a free standing Ground Station with a 5.8G uplink to the monitor or Goggs, so it's not going to be a problem, especially since my Taranis will be fitted with a directional Moxon.
  Cant see more than 500 mw being needed myself....500mw is a load of RF.
What does a standard 2.4G Taranis Module run on..?...60 mw max?

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Coyote

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Re: FrSky R9M....868mhz European Frequency.
« Reply #64 on: November 03, 2018, 09:39:24 PM »

Yes that was using 5.5dB in the calcs.

EU have 60mW limit with the likes of the USA run 100mW
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English Turbines

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Re: FrSky R9M....868mhz European Frequency.
« Reply #65 on: November 03, 2018, 09:48:12 PM »

Yes that was using 5.5dB in the calcs.

EU have 60mW limit with the likes of the USA run 100mW

Hi Ian,

Yes, 60 mw I seem to remember is our EU RF limit on 2.4G although I run the FCC Firmware

  I just watched the video again, he actually managed 9.5kms on a claimed 25 mw using the Moxon..?
  He's using the R9 Slim receiver though....9.5 kms on 25 mw..?....Remember, the X Lite TX Modules output is limited to 100 mw max.  He's using that Transmitter in the video for sure.

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Coyote

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Re: FrSky R9M....868mhz European Frequency.
« Reply #66 on: November 03, 2018, 09:52:51 PM »

100mW Using a Mox and dipole on the plane gives 8.28km / 5.14miles so in exceptional conditions maybe he could scrape 9.5km if the Slims receiver is especially more sensitive. But not a hope on 25mW.

So he is mistaken or telling porkies about 25mW
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English Turbines

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Re: FrSky R9M....868mhz European Frequency.
« Reply #67 on: November 03, 2018, 10:12:44 PM »

100mW Using a Mox and dipole on the plane gives 8.28km / 5.14miles so in exceptional conditions maybe he could scrape 9.5km if the Slims receiver is especially more sensitive. But not a hope on 25mW.

So he is mistaken or telling porkies about 25mW

  I agree about the 25 mw, it does not sound feasible to me either...I can easily see it possible on 100 mw though, at 9.5kms he had approx 75% RSSI in his OSD and it was very stable too.
  He stated he was using the telemetry option, so maybe be started on 25mw and it switched up automatically?

  Why?...Because 6kms @ 100mw is possible using an XM Plus on 2.4G.

 868mhz is approx 1/3 of the frequency...Sounds easily possible to me, the lower frequency has to help..?

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« Last Edit: November 03, 2018, 10:15:08 PM by English Turbines »
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Brucey

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FrSky R9M....868mhz European Frequency.
« Reply #68 on: November 04, 2018, 06:38:29 AM »

Lots of people have had issues with 868 and 1.2g. The problem is the wide front end of the 1.2g receivers.
The solution seems to be a notch filter on the 1.2g Rx
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English Turbines

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Re: FrSky R9M....868mhz European Frequency.
« Reply #69 on: November 06, 2018, 08:36:25 PM »

True-Mox 868 mhz.

  You will need an adaptor to mount it on the R9 Module....



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English Turbines

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Re: FrSky R9M....868mhz European Frequency.
« Reply #70 on: November 09, 2018, 03:44:09 PM »

 This was my approach to the 868mhz Dipole antenna problem on my Ranger G2.

  It's a new plane, Flight Controller, Control System...(sorry my bench is so tidy)

 What could possibly go wrong.?..:)

                                                                                               



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Coyote

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Re: FrSky R9M....868mhz European Frequency.
« Reply #71 on: November 09, 2018, 04:30:35 PM »

Haha ! What possibly :)

Did you put the spirit level in there ? : )
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English Turbines

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Re: FrSky R9M....868mhz European Frequency.
« Reply #72 on: November 09, 2018, 08:19:04 PM »

Haha ! What possibly :)

Did you put the spirit level in there ? : )

lol...

  No, that little yellow bubble globe is standard with the model, ridiculous really, the CG points are moulded in the wing panels.
It's a bit pricey for what it is and I dumped the standard motor for the Sunnysky in the pic...
  Be interesting to see how it performs, with the F405 in it, I can switch up to a 4S Lipo and not worry, but Im hoping the 3S will be fine.

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Coyote

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Re: FrSky R9M....868mhz European Frequency.
« Reply #73 on: November 13, 2018, 05:30:20 PM »

With an issue with the OpenTx 2.2.3 firmware I had and the flerx users still experiencing the close range failsafe issue ( presumably while dynamically swapping power ) I have decided to instead downgrade to OpenTx 2.2.2 Stable and use the Dev code that so far has a different protocol that seems to have cured the failsafe issue.

Nobody as of yet has reported any problems at all with it, but it is an unofficial release.
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CurryKitten

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Re: FrSky R9M....868mhz European Frequency.
« Reply #74 on: November 13, 2018, 11:24:55 PM »

Just reading your Facebook post about that firmware Ian - and it sounds like that you set it to FCC but it still uses 868Mhz... which sounds a bit odd, is it a specific EU version or something ?
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