Optispeed TDR log.

[Rctintin]

Ben. thanks for the sticky, I look forward to seeing how this goes.

I would hate to see this thread turn into a Futaba vs JR/Spektrum debate again, but this could be a REAL issue here for you.

There is a very real, valid reason that most speed guys in Germany use either Multiplex or Futaba. It is simply because it has the most solid radio link. Jamiem is selling his 8FG for less that £200 IIRC, and a S-Bus RX new at Innwoods is less that £60. You then have an insurance policy on Spunky for around £250!! Bargin.

[KevDavies]

these little glitches with Spekky are why im staying on 35mhz. Yes ive had spektrum before and it worked well, but i did get glitches a lot of them. PCM1024 or 2048 if you have the right tranny are much better in my book. and signal loss is negligable because there is no reboot of system to be had. ALSO now 99% of you lot are on 2.4ghz i dont have to worry about signal clashes LOL

[KnifeEdge]

Re: Optispeed TDR log.

Thanks for the offer Paul but literally no heli funds.

you could also upgrade to DMSS, when u get funds

[KnifeEdge]

Re: Optispeed TDR log.

you could also upgrade to DMSS, when u get funds

I think JR sell a DMSS module that you can plug into the back of your JR11X. that way no need to buy tx's all your helis.

[Andy from Sandy]

The only thing I can see wrong with the Spektrum kit is the little JST connectors they decided to use on the satellite cables. If you plug these in once they are fine. If you have to pull on the cable to get them out then they are probably not fine again. It would do to just purchase some new cables and change them. Once installed don't touch them and go fly. If you ever unplug them by pulling on the wire then throw the cables away and purchase new ones.

JST have just brought out some larger connectors of a similar design so they must know the small ones are a bit iffy.

[Rctintin]

Andy, this has nothing to do with the Sat's or the leads. It is to do with how the 2.4 protocol works, and how different company's use that protocol.

JR/Spektrum systems chose 2 vacant signals and stay on them. Futaba (and now JR with their new DMSS) hop between the signals every few seconds, and this makes for a much more reliable link.

Futaba were the first company to use 2.4 in RC over 20 years ago, but they soon discovered that it was not reliable enough for the RC Hobby market. What they used it for, and developed it for was such things as over head cranes in factorys etc. Spektrum were the first to bring it to the hobby market, but the design was flawed. This is why they them selfs changed to DSM2, and now DSMX. Futaba's FASST was the first reliable 2.4 link, that has now been adopted by JR. Even JR have stopped using the sats in favour of 2 wires like the FASST receivers.

If indeed there is a module available to go into the X11, that would be the most sensible route forward with a compatible Rx in Spunky as Ben already has the X11.

[Stuart]

Andy, this has nothing to do with the Sat's or the leads. It is to do with how the 2.4 protocol works, and how different company's use that protocol.

JR/Spektrum systems chose 2 vacant signals and stay on them. Futaba (and now JR with their new DMSS) hop between the signals every few seconds, and this makes for a much more reliable link.

Futaba were the first company to use 2.4 in RC over 20 years ago, but they soon discovered that it was not reliable enough for the RC Hobby market. What they used it for, and developed it for was such things as over head cranes in factorys etc. Spektrum were the first to bring it to the hobby market, but the design was flawed. This is why they them selfs changed to DSM2, and now DSMX. Futaba's FASST was the first reliable 2.4 link, that has now been adopted by JR. Even JR have stopped using the sats in favour of 2 wires like the FASST receivers.

If indeed there is a module available to go into the X11, that would be the most sensible route forward with a compatible Rx in Spunky as Ben already has the X11.

With such a bespoke heli I would go Futaba or JR DMSS especially when you look at range, loss of signal will drop off far quicker with Spektrum.

[Andy from Sandy]

I mentioned the cables because that is the faults I have seen when things have gone wrong. I am a Futaba user myself.

[Jamin_00]

How is that achieved James? Do I just change the module?

Lets do some looking around then I guess.

[Rctintin]

Give Steve Roberts a call at McGreggors mate

[KnifeEdge]

Re: Optispeed TDR log.

How is that achieved James? Do I just change the module?

Lets do some looking around then I guess.

yes. see here:

http://www.macgregor.co.uk/jrpropo/module.htm

[Jamin_00]

Which would I need?

How much

[KnifeEdge]

Re: Optispeed TDR log.

i would speak to Steve Roberts, thinking on it, has the DX11 got a module slot? I know the 11x zero did.

[Angelos]

I am not a big fan of Spektrum myself but I don't think the radio is to blame for this incident. The channels seem to have been missed just once and normally the flight controller will hold the last stick input.

Higher PRM and higher airflow past the rotor would make the cyclic more responsive in a similar way a plane would roll faster at higher steeds. I wonder if this increase of mechanical gain in the rotor made the system spontaneously unstable.

-Angelos

[Stuart]

As far as I understand for speed runs you run less gain in the vbar system which would make sense.