I was considering putting a JR R921(2.4Ghz) receiver in my T2A MKII to replace the Futaba 127DF(72Mhz) receiver. The tuned pipe runs just above the receivers. The most open area I can find to mount the satellite receiver is just aft of the servos. This will place it between the tuned pipe on top of the fuse and and the metal pushrods going to the elev/rud. Has anyone installed the 2.4Ghz Spektrum/JR receivers in an installation like this and flown it? I would like to change this plane over to the 2.4Ghz JR system, but the antennas will be awfully close to a lot of metal. Also, not shown in the photos, there is a metal cable going to the nose wheel steering on one side of the fuse and a metal control cable to the throttle on the opposite side of the fuse.

I find it interesting that so far no one has replied that they have made the transition to the 2.4Ghz system with these old birds. One thought I had in placing the satellite receiver was to use a quick disconnect receiver extension like this, http://www.horizonhobby.com/Products...rodID=SPMAJST6 . That way I might find a suitable location in the wing to mount the satellite receiver.

Horizon offers different length extension wiring for the satellite receivers. There should
be one long enough to put the receiver almost anywhere.

tommy s

in any case, the best result will be with the futaba fasst system, as the receiver only recognise the transmission of your transmiter and ignore everything that have not the good code, independantly of the frequency actually used.... unbeatable.... the same system is used to remote control satellites, missiles.. etc.... and the range is... no problem...
spectrum system is not locked by a code...

Hey - Futaba is better for 2.4 ? Does this mean only one receiver? I have never looked at their system, since I use all JR, I just purchased the X9303 - 2.4 with the 921 receiver,and never looked back.
Now that I have decided to convert my pattern planes, like AirBus Driver here, I have been looking inside also for room, what and where.

My thoughts until seeing this thread I figured buy the JR 7 channel 2.4 receivers, GET 'ER DONE ! You saying Futaba easier?

Vince

Yes, I have done this.

My plane is 15 year old-- a Super Kaos 60 with a Rossi FIRE turning an 11x7 APC and a Macs long muffled pipe.

Since I have gotten into 3D, I had no use for the digital servos which came with my DX7 system, and I've been meaning to resurrect my old favorite pattern bird. I changed out the clunk fuel tube, and battery too.

I'm using the Spektrum 6 channel RX which comes with 1 remote RX. I put the RX's so they're imbedded in a soft foam rubber cube with the antennas orthogonal to each other (one points horizontal, the other vertical). This sits above the wing wedged in the fuselage cavity behind the throttle servo. The tuned pipe runs along the top of the fuse so it's directly above this setup.

I've gotten over 40 paces in a range check and I've flown the plane to the limit of my eyesight. It's totally bulletproof and I'm very happy with the results. It's as fast and furious as ever.


I'd be careful making claims about Futaba Fasst vs Spektrum if I were you-- especially when insinuating that the lack of remote recievers of the FASST system is somehow better than the multiple dipole remote antenna options offered by spektrum. From a physical standpoint of shadowing and diffraction of the small wavelength RF signal, a single antenna doesn't seem to make sense to me, nor to other EE hobbyist types I've consulted.

Don't mean to perpetuate a war, but the original question expressly asked about an issue of RF blocking due to a tuned pipe and metal equipment in close proximity to the RX (antenna). The use of codes isn't going to help this issue.

The last word will always be known when you do a range check. Be sure to do the range check from several attitudes. Putting a remote antenna in the wing will probably help, but I'd be surprised if this was actually necessary. Spektrum considers a successful range check to be 30 paces away, and I easily surpassed this with minimal effort.

The guys flying full carbon gliders have the hardest problem now with shielding. I don't consider any non-carbon airframe a challenge anymore with today's options for 2.4 GHz (Futaba AND Spektrum).

Joe

for what to do two receivers? according to spectrum idea, it permits to receive two different signal on two frequency... but only two... because of the development of wi fi system for internet,it is not enough, and the spectrum have to reinit sometimes during the flight, in order to find another frequency.... you ll never know when it is going to happen, but it takes between 2 and 7 seconds... during this time, you are a spectator of your plane....
fasst changes frequency 500 times per second, and accepts the signal only if there is the dedicated code to your airplane with it.... so, many many times per second, the parasite signal of a wi fi sistem is ignored... and many many times per second, the signal from your radio is accepted.... you don t feel anything because it is too fasst for you... what can beat that for security?

airbusdrvr go ahead there is no problem I 've flown planes with worst conditions without any problems, Spektrum sistem has no problems at all, I been flying with it for over a year now and have never known about a single glitch or whatever.

Most inexpensive place for spektrum recievers etc is www.lightflightrc.com try it you want regret Dave is a great guy who will give you outstanding service.

regards.
Rafa

Daggets,

If you're going to post remarks about a system, any system, you should learn
something about it first so you won't look foolish, because you sure don't
know what you're talking about with those remarks about the JR and Spektrum
2.4 systems. The satellite receivers are not there to pick up two different frequencies,
they are there so the receiver is always receiving an unobstructed signal, free from
being blocked by something. The Spektrum systems with only one receiver are still
receiving two different frequencies at the same time.

tommy s

This is a complete no-brainer. The Spektrum receiver placement is not critical at all. Its only a little bit of an issue if there is a lot of CF in the model, but that also easy to get around by moving the remotes till the reception is best.

We've flow it it many different types of models in different configurations and it just works. Personally, I will never fly anything but Spektrum 2.4 again in anything.

I'm not going to get into any war on here and I not am going to say any more on this, but daggets the information you stated regarding Spektrum and how it works is simply very much INCORRECT.

Before you buy Futaba you might want to read this http://www.rcuniverse.com/forum/m_6857282/tm.htm

Well I'm proceeding with the installation. Thank goodness I'm using the JR R921 receiver which is compatible with the Data Logger. That way I can do the advanced range check and see how all the antennae are receiving and check for holds and fades. This airplane has so much STUFF in such a small volume, it reminds me of what Dolly Parton said her dad had commented. Referring to Dolly's attributes, he stated, "It is surely hard to put ten pounds of flour in a five pound sack." I mentioned above I was thinking of placing the satellite receiver in the wing. Won't work. So it all is going in the fuse.

You might also want to look at this link before using your Spektrum:
[link]http://www.rcuniverse.com/forum/m_6923021/tm.htm[/link]

I started that thread and all of my receivers are upgraded. But thanks for passing any info along. It pays to stay abreast of the latest info for one's equipment.

i have got spectrum and fasst system... 6 in flight re init with the spectrum, 0 trouble with the fasst.... this is actual field result.... if my explanation is not correct, the all idea is... buy and use what you want, some people will swear they have no problem with a chinese am 27 megahertz, it is just fine for me, as i just want to share my experience with anyone who is interested....

Here we go with specious commentary in which they publically demonstrate a clear lack of knowledge relative to Spectrum technology.
McConville said it best --- no further comment is really required.
Airbus -- install it and go enjoy the benefits.

As if things weren't bad enough for non electronic/radio types trying to understand how our old systems worked and compared, the new SS gear is really a brain twister. I doubt if the non technology types will ever grasp any of the fine points of 2.4 GHz encoding/decoding schemes. In fact, I'm beginning to suspect that many of the techies won't really get a good grip on things because I haven't seen how these systems really work published anywhere. I guess that time will sort it all out eventually.

So far, I'm using three different types of 2.4 GHz R/C systems and all are working just fine. I refuse to worry about it until there is a real reason to.


Ed Cregger

The fuse is done with all but the throttle servo to be travel adjusted. I have one clevis to attach before I can adjust the throttle. Then the wing will be attached and I will rebind the whole system for neutral and gear down fail safe positions. Then I'm going to do the advanced range check procedure and check the data with the Data Logger. Will report when done with that.

what everybody is confused with, is that the performance of a system depends of the environnement.... in france there is a lot of perturbations... unlike in the arizona desert.... i wonder why american militaries did not choose a spectrum technology for nuclear weapon and sattellites control.... perhaps because i m a no brainer.... but if the fully sponsorised mc conville did say so.., the argument cannot be taken for specious... i believe your car is more shiny than mine also...

Test results are posted in the Radio Forum. Hopefully some JR expert will see the post and comment. Go here to see the results, http://www.rcuniverse.com/forum/m_70...tm.htm#7049252

That's why I plan on just waiting several more years for them to iron out all the bugs with these systems. I have all Futaba stuff, so I guess I'll just have to wait for them to improve their SS technology.

Mon dieu tu est vraiment idiot ou quoi ? il faut lire a concience pas ecrire sans savoir.

i m a bit fed up with insults, especially when i m right, it will be the end of this discussion for me....



Posts: 680
Joined: 2/16/2007
From: fresno, CA, USA
Status: offline the fact that, and this is from Futaba's site,

"Other 2.4GHz systems hold firm to one or two frequencies, increasing the potential for interference. The frequency of Futaba 2.4GHz FASST shifts every 2 milliseconds, so there are no signal conflicts or interruptions – and no need for a frequency pin!"

http://www.futaba-rc.com/radioaccys/futl8926.html

so some of you will be able to talk about technics instead of insulting with no arguments...

http://2.4gigahertz.com/techsupport/...m7-7c-6ex.html