Announcement

Collapse
No announcement yet.

A weird situation at the field

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • A weird situation at the field

    Hey all,
    Just wanted to run this past ya.
    Something strange happened this past Sunday.
    Myself and a friend were flying FPV about a mile away from where my regular LOS field is, my friend experienced two instances of total control loss (still had video) with the same quad. I also had two instances of control loss (again video was fine) on two different quads. This all happened within the space of about half an hour. Three of the four instances resulted in loss along a perfect line in the field.
    Unbeknown to us until later, three flyers at the LOS club site had similar experiences. Two of the lads unfortunately had control losses that totalled their models, the third was very nearly a total loss as well (recovered less than twelve inches from the ground apparently!) All three also had issues within quite a confined area.
    All of these events we recon, happened within about an hour of each other and here's the cincher, all pilots were using Spektrum. Four of the TXs were DX18 Gen1 of various ages and the other was a two week old DX7s
    I personally think it unlikely to be any kind of hardware failure and more likely some sort of bizarre RF event. There is a radio mast pretty close to both sites. We were using a variety of receivers, an AR7200BX, a DSMX sat, a lemon PPM rx with sat and a Lemon diversity RX and an AR8000 IIRC.

    Just wondering what ya'll think about it?

    Cheers
    D
    .......unless otherwise stated, all opinions are my own.

  • #2
    FPV video is on 5.8Ghz, DSMX is obviously 2.4Ghz. I would guess most likely some large scale interference - as you say, maybe caused by a mast, or maybe electrostatic in the atmosphere?
    Tom
    sigpic Synergy E7SE - Kontronic Helijive 120+ ESC, vBar Neo
    SAB Goblin 630 Competition
    - Castle Edge 120HV, vBar Neo
    Blade 700X - Castle Edge 160HV ESC, Mini vBar
    Logo 550SXv2 - Castle 130LV ESC, vBar Neo
    .... and a Gaui X3
    Spektrum DX8 ; Mikado VBC ; RealFlight 7 & neXt sims
    ... and two EGS'



    Comment


    • #3
      A lot of farmers are now using 2.4 ghz transmitters for cctv between home and calving sheds and security systems.Could this be the source of your problems.
      Ron

      hobby-hangar.co.uk
      SWRCH-GO big or Go home!
      http://www.ultimatebuildandfly.co.uk/

      Comment


      • #4
        We suspect the mast is for the railway line that runs though there but could just as easily be anything, good suggestions both.
        Thank you guys.
        D
        .......unless otherwise stated, all opinions are my own.

        Comment


        • #5
          Just to add they are directional too so can cause localised areas of interference. We had an area at our local field where signals dropped regularly,we never did prove or disprove it was due to this.
          Ron

          hobby-hangar.co.uk
          SWRCH-GO big or Go home!
          http://www.ultimatebuildandfly.co.uk/

          Comment


          • #6
            Originally posted by Boggy View Post
            Just to add they are directional too so can cause localised areas of interference. We had an area at our local field where signals dropped regularly,we never did prove or disprove it was due to this.
            That might explain the localisation of the failures.....
            .......unless otherwise stated, all opinions are my own.

            Comment


            • #7
              look for lines between sheds and farm houses. (not necessarily between them but inline as the signal from a shed to the house can be stronger than needed and flow further past. ) I believe some are good for 1 and1/2 miles
              .)
              Ron

              hobby-hangar.co.uk
              SWRCH-GO big or Go home!
              http://www.ultimatebuildandfly.co.uk/

              Comment


              • #8
                Aliens.
                Tron 7.0 advance Vbar evo V Control
                Foamy plank
                icharger 3010b, Coolice 24v psu
                Member of MK Heli Club and LMAC

                Comment


                • #9
                  Ummm that's a worry about the possibility of the signals from the masts
                  makes you worry about when will it happen again,

                  i was one of the unfortunate ones who lost a heli due to total loss of signal


                  even if this has been the case it does seem that there is more posts across the web about Spektrum sets losing signal as say futaba


                  gary
                  PROTOS 700 MAX V2
                  GOBLIN 500
                  GAUI NX4
                  TREX 600 NITRO DFC

                  Comment


                  • #10
                    Originally posted by garturbo View Post
                    Ummm that's a worry about the possibility of the signals from the masts
                    makes you worry about when will it happen again,

                    i was one of the unfortunate ones who lost a heli due to total loss of signal


                    even if this has been the case it does seem that there is more posts across the web about Spektrum sets losing signal as say futaba


                    gary
                    Please! lets not go there!
                    Ron

                    hobby-hangar.co.uk
                    SWRCH-GO big or Go home!
                    http://www.ultimatebuildandfly.co.uk/

                    Comment


                    • #11
                      Saw this for myself at a plank field near MK. One of the members was was flying something a bit large, and reported total loss of control. Think fail safe was set to retain last position, so the model continued around and he regained control. Went straight back to that area, and again no control for a couple of seconds. So two instances of loss of control about a minute apart. Model was flying fine for the remainder of that flight, he just kept it away from a very localised spot.

                      There is a mast nearby, and speculation was that he had flown through a link between that mast and a larger one a couple of miles away. Dsm2 system used chooses two frequencies and hops between. I've experienced similar on a wing just falling out of the sky in the same area using a DX7 SE. Checked battery and chucked it back up, no problems until I flew back into this area to set up landing approach and it again fell out of the sky. Switched off tranny, back on and new battery, model could then fly through this area.
                      TDR (awesome machine) and TDF (almost built)
                      Strike7
                      SAB Kraken 700 & 580, G570KSE, G420, Buddy 380
                      XK-K110 x4
                      Futaba 18SZ
                      Member of the MKHELI Club

                      Comment


                      • #12
                        It's worth asking whether you're using DSM2 or DSMX? There's potential for both to be overpowered by a strong directional signal, but of the two DSMX will be the more likely to cope with interference.
                        Helis: Oxy 2 FE / Oxy 2 Sport / Protos 380 / Oxy 4 Max / Gaui X3 380mm
                        Electronics:
                        Spartan VX1e / Spartan VX1n / Spartan VX1p / MSH Brain2 mini / Jeti DS-14
                        Sims: Realflight / AccuRC
                        / Phoenix RC (Wireless) | AccuRC (Wireless) | Realflight (Wireless)

                        Team rep for Lynx/Oxy, Founder of NightWave Systems, #450guy

                        Comment


                        • #13
                          I was the lucky one I guess who just managed to save my heli. I believe what has been said is definitely getting close to the problem as for me the 3 helis that had the problems were all in the exact same spot on the field and thinking about it, the interference looks like it struck at the same height, Gary was unfortunately in a nose down dive and had no chance to recover. I was travelling inverted forwards when my heli made its dive for the ground so more than likely I just had that split second more to regain control than Gary.

                          I've been flying Spektrum for years and never had any bother. I had flights before and after the near fatal flight with no issue on the same day and since and I still have confidence in my equipment. However I think Gary has zero confidence in Spektrum now. He does everything to make sure his helis won't fail, had a rescue set up on the heli and an optigaurd but of course if you have no signal, none of that will help.

                          IIRC he had a radio link again when the heli was unfortunately on the ground which leads me to think there was definitely something in a certain line and a certain height which caused the interference.
                          From my recollection everyone was DSMX.

                          Paul
                          Goblin 380 - Vbar Control and Neo
                          Goblin 570 - Spirit
                          Logo 690SX V2 - Vbar Control and Neo
                          T-rex 700LE.... the "Giraffe"! - Spirit
                          T-rex 700E DFC Pro - Spirit

                          Comment


                          • #14
                            Originally posted by Mike Sanders View Post
                            Aliens.
                            My thoughts exactly Mike!
                            I have however examined the exit hole and there don't appear to be any signs of gang probing......

                            D
                            .......unless otherwise stated, all opinions are my own.

                            Comment


                            • #15
                              Originally posted by maddog7 View Post
                              My thoughts exactly Mike!
                              I have however examined the exit hole and there don't appear to be any signs of gang probing......

                              D
                              No need Dave... no need at all!!!
                              Goblin 380 - Vbar Control and Neo
                              Goblin 570 - Spirit
                              Logo 690SX V2 - Vbar Control and Neo
                              T-rex 700LE.... the "Giraffe"! - Spirit
                              T-rex 700E DFC Pro - Spirit

                              Comment

                              Working...
                              X