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Author Topic: FrSky R9M....868mhz European Frequency.  (Read 11203 times)

FPVSteve

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Re: FrSky R9M....868mhz European Frequency.
« Reply #105 on: December 11, 2018, 01:41:50 PM »

I don't get it - why would they screw the reputation of their gear by bodging the cheapest part of the entire system - the antennas. Some bad QA in the factory if they're coming out between 68mm and 74mm and they should be 78mm.
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English Turbines

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Re: FrSky R9M....868mhz European Frequency.
« Reply #106 on: December 11, 2018, 05:17:29 PM »

Today I flew the Ranger G2 again with the R9MM receiver in it. This is after modifying the antenna to 78mm long for 868mhz.
  With the TX output increased from 25 mw to 200 mw it would appear to be worse, not better.
 Unless the antenna mod requires a Re-Bind...?...Dunno, but it's a disappointing result......

 The FXT Venus Pro Camera has been evicted and replaced by a Runcam Sparrow....





                                                                                               :vulture:
« Last Edit: December 11, 2018, 05:19:35 PM by English Turbines »
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Coyote

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Re: FrSky R9M....868mhz European Frequency.
« Reply #107 on: December 11, 2018, 07:28:29 PM »

I'm out right now, but I'm sure when I ran the sums I got 82mm not 78 like Pavel got. But he did have a meter.

No rebinding is not required. 
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English Turbines

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Re: FrSky R9M....868mhz European Frequency.
« Reply #108 on: December 12, 2018, 11:56:22 AM »

I'm out right now, but I'm sure when I ran the sums I got 82mm not 78 like Pavel got. But he did have a meter.

No rebinding is not required.

  Hi Ian,
              Well, without doubt its worse IMO now even with 200mw of output.  The RSSI was dropping like a stone only 500 mtrs out.  At least I got to test the RTH, (which works really well).
  For now, Im pulling the R9MM and substituting an XM Plus, which is pretty easy to do.
Im not messing with Nightly Builds, I did notice they have a newer Firmware for FCC Mode, one of the fixes was unstable RSSI between 300 and 500 metres, so maybe it will get sorted at some point.
  My guess is they are putting all their efforts on the adaptive RF Firmware...For now, it's on the shelf as far as Im concerned.
I think FrSky have bitten off more than they can chew due to the functionality they are aiming for.

                                                                                                :vulture:

 
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FPVSteve

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Re: FrSky R9M....868mhz European Frequency.
« Reply #109 on: December 12, 2018, 04:55:56 PM »

It's not down to where you're flying is it?
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Coyote

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Re: FrSky R9M....868mhz European Frequency.
« Reply #110 on: December 13, 2018, 06:39:17 PM »

www.youtube.com/watch?v=D7rQ-ypFyWU
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chris-s

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Re: FrSky R9M....868mhz European Frequency.
« Reply #111 on: December 13, 2018, 08:42:16 PM »

Strange, as some people seem to have great results. What about just ignoring the rssi and flying until it fail safes? If youíve got rth then should be no issue. I know thatís what I will do when I finally get the s800 finished.

Chris
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Coyote

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Re: FrSky R9M....868mhz European Frequency.
« Reply #112 on: December 13, 2018, 09:21:22 PM »

Success is very inconsistent but it all seems to be a close range mini quad issue. Everyone flying planes out to reasonable distances don't really seem to be reporting any problems.
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English Turbines

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Re: FrSky R9M....868mhz European Frequency.
« Reply #113 on: December 13, 2018, 10:40:56 PM »

Success is very inconsistent but it all seems to be a close range mini quad issue. Everyone flying planes out to reasonable distances don't really seem to be reporting any problems.

  I wish that were true, the R9MM obviously doesn't work as well as the more expensive dual antenna receivers and my tests seem to indicate that polarity is affecting matters.....Take a look at the OSD readings a mere 500 metres out...?



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SW1900 & Storm.

chris-s

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Re: FrSky R9M....868mhz European Frequency.
« Reply #114 on: December 13, 2018, 11:43:45 PM »

But is it just something screwy with the way the rssi is being measured/reported or is the range really not up to expectations?
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English Turbines

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Re: FrSky R9M....868mhz European Frequency.
« Reply #115 on: December 14, 2018, 04:03:43 PM »

But is it just something screwy with the way the rssi is being measured/reported or is the range really not up to expectations?

  That's another possibility....I tuned the RX antenna, upped the RF output and it actually gets worse, not better...?

  Im using the usual Channel 16 RSSI on the SBUS....I dont think Wayne (C. Kitten) does it like this though?

 Maybe he can comment here..?

                                                                                                :vulture:
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Nothing beats the smell of Jet-A at 800 Celsius...:)
Falcon UHF & 1280mhz Video.
SW1900 & Storm.

FPVSteve

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Re: FrSky R9M....868mhz European Frequency.
« Reply #116 on: December 14, 2018, 06:52:36 PM »

In the interests of science can you fly out of range of the visual RSSI indication and see if you still retain control?
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chris-s

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Re: FrSky R9M....868mhz European Frequency.
« Reply #117 on: December 14, 2018, 07:32:38 PM »

In the interests of science can you fly out of range of the visual RSSI indication and see if you still retain control?

... and for our entertainment!
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FPVSteve

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Re: FrSky R9M....868mhz European Frequency.
« Reply #118 on: December 14, 2018, 07:35:48 PM »

Well his RTH seems pretty spot on :)
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CurryKitten

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Re: FrSky R9M....868mhz European Frequency.
« Reply #119 on: December 16, 2018, 08:23:15 PM »

  That's another possibility....I tuned the RX antenna, upped the RF output and it actually gets worse, not better...?

  Im using the usual Channel 16 RSSI on the SBUS....I dont think Wayne (C. Kitten) does it like this though?

 Maybe he can comment here..?

                                                                                                :vulture:

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 documneting 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
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