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Author Topic: FrSky R9M....868mhz European Frequency.  (Read 5218 times)

Coyote

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Re: FrSky R9M....868mhz European Frequency.
« Reply #120 on: December 16, 2018, 08:59:00 PM »

When I did my initial flights using the stock rubber duck antennas and used ch16 RSSI I got my figure into single figures multiple times, but without any loss of control.  It tended to jump around all the time quite erratically.  I few people commented that "everyone knows that RSSI on ch16 doesn't work".  Using the grapevine is an interesting way of documenting things, but I'd compared the RSSI figure from the telemetry and ch16 and they were massively different, with telemetry looking slightly less erratic and not dropping off at the drop of the hat.  FrSky told me that their guys are "working on it with the Betaflight devs" which confused me as their stuff works fine on 2.4, so what's changed !?

Anyway, I've been using the RSSI telemetry signal and then sending it back on a channel for betaflight to pick up and put it on the osd.  Trouble is though, that on LBT you only get telemetry on 25mw unless you go to flex firmware and I hear nothing but bad things about doing that (or using a nightly build of OpenTX 2.2.3 ) a the moment

That brings me to an interesting point that seems to confuse some. Some people are under the impression that with the Flex firmware brings higher power so further distance telemetry will be available.

This is completely false, the power level is for the transmitter only, the receiver has its set power and that's all. The transmitter will be able to control the craft from further and further away, but its reception will not improve so the telemetry will be lost at the same distance it would on 25mW because its range is governed by the receives transmission power, so with adaptive power you do in fact telemetry wise you gain absolutely nothing. So reading the RSSI straight from the Rx and putting it on the OSD is the only practical way of RSSI until the range limit is hit. Any telemetry based RSSI would be rendered useless.
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FPVSteve

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Re: FrSky R9M....868mhz European Frequency.
« Reply #121 on: December 16, 2018, 09:37:32 PM »

It's always been that way - the 2.4GHz stuff I use has telemetry coming back and the "beeps" are only indicative of the Tx not receiving Rx signal, not the other (more important) way around.
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CurryKitten

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Re: FrSky R9M....868mhz European Frequency.
« Reply #122 on: December 16, 2018, 10:54:54 PM »

All true stuff, I used to lose telemetry on the 2.4 DRii+rx's after about 3.5km but no issues with control signal.  All my videos so far have come from the angle of flying quads which would (I think generally) be in relatively close range, at least compared to a plane.  I live in hope that they sort out the firmware so that you get a decent RSSI level from ch16, because at the moment it's not usable (IMO obviously)

Coyote

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Re: FrSky R9M....868mhz European Frequency.
« Reply #123 on: December 16, 2018, 11:06:54 PM »

Well I don't really see much need other than to have an analog pin available on the Rx to output RSSI, that's all that's needed.
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English Turbines

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Re: FrSky R9M....868mhz European Frequency.
« Reply #124 on: December 17, 2018, 11:47:18 PM »

Well I don't really see much need other than to have an analog pin available on the Rx to output RSSI, that's all that's needed.

  Hi Ian,
              Agreed, Telemetry based RSSI is a complete waste of time if you are going for distance. It's also hard work.
  I looked at the R9MM Manual, I dont think it has a RSSI pad, I was hoping it would have one.
  The R9 Slim has it on an output pin.
 I think the R9mm receiver is a bit of a dog's dinner, and FrSky offered it on the cheap just to get a Combo in their Sales push.
   That said, the XM Plus on 2.4G is a superb receiver....Im still wondering why the R9MM only has one antenna TBH.

                                                                                                :vulture:
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English Turbines

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Re: FrSky R9M....868mhz European Frequency.
« Reply #125 on: December 20, 2018, 12:24:27 PM »

December 20th 2018....Update:

  This guy has appeared to pull off some kind of Black Magic...lol....Using standard non Flex Firmware and only a fixed 200 mw output, he has had this brand new bird out to 12 kms with a stable RSSI showing..?
  Im using the same Firmware and cant manage 1 km without the RSSI being very unstable and all over the place...
 Is the stable RSSI anything to do with Arduplane?  He even has the standard RD on his TX Module.

 Answers on a Postcard please....lol


     
www.youtube.com/watch?v=PKRKWohZGdI



                                                                                                :vulture:
« Last Edit: December 20, 2018, 12:26:52 PM by English Turbines »
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Coyote

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Re: FrSky R9M....868mhz European Frequency.
« Reply #126 on: December 20, 2018, 01:58:20 PM »

Loads of people are having brilliant results with it, normally guys who never touched anything, flying stock gear, by themselves. Some have been experiencing "issues" lately, but the ones that do from what I have noticed are the ones that have upgraded firmware, not the ones that didn't............
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chris-s

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Re: FrSky R9M....868mhz European Frequency.
« Reply #127 on: January 09, 2019, 08:06:21 AM »

I see OpenTX 2.2.3 has been released in the last few days. This version has the adaptive power control feature which some of you have been trialing whilst in beta. Iíve still yet to use my R9 in anger.
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Coyote

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Re: FrSky R9M....868mhz European Frequency.
« Reply #128 on: January 09, 2019, 08:11:01 AM »

The adaptive power feature seems to be a key part of its failure. Not the OpenTx part of it though, just the 868 adaptive side of it.
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English Turbines

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Re: FrSky R9M....868mhz European Frequency.
« Reply #129 on: January 09, 2019, 09:09:49 PM »

The adaptive power feature seems to be a key part of its failure. Not the OpenTx part of it though, just the 868 adaptive side of it.

  Im inclined to agree....Im not sure why they felt the need to put all their effort directly into the adaptive power Firmware when the fixed power level Firmware was / is still hopeless on 868mhz??.
  Its seems all a bit backwards to me...?...I mean 200 mw on 868mhz should get you plenty of range, but it just doesn't for most people.

 Arcx Angel seems to be the exception, his R9MM doing 12 kms on 868mhz and 200  mw only proves the point, and he's using the standard RD on his TX Module.
  It's a complete mystery to me how he's doing it...?....see his video in this thread above... :yeahthat:

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Shikra

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Re: FrSky R9M....868mhz European Frequency.
« Reply #130 on: January 09, 2019, 09:17:48 PM »

Did you resolve issue with your range?
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English Turbines

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Re: FrSky R9M....868mhz European Frequency.
« Reply #131 on: January 11, 2019, 07:46:28 PM »

Did you resolve issue with your range?

  Hi m8,
             Nope, it's clear the R9MM receiver seems to lack sensitivity....dropping into the low 40s a mere 600 metres out, hopeless.
Im waiting for the Firmware to be released.... :'( :'( :'( :'( :'(

 The other elephant in the room which nobody is talking about, is that in order for Flex RF power to work, it needs a downlink as powerful as the uplink, otherwise, how is the TX Module going to know about increasing power levels...?
   Okay at short ranges, but what about 10kms out?
  On the Crossfire receiver it has two sleeved Dipoles for this purpose, not on the R9MM though.


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« Last Edit: January 11, 2019, 07:50:45 PM by English Turbines »
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