Haven't we some reports of problems?  Not sure if we have seen as many as with 72 or not.

In reality, I don't see why anyone has to completely change over anything. I have a DX-7 that came shortly after they went on market. I have a DX-8 that I got early in this year. The DX-7 is installed in a night flier because the neon lights don't bother it and none of my 72. (JR, Futaba, Airtronics, and Hiitec, total 7) could do that. As a note, the Airtronics did the best as I could get 7-800 ft with it while the others barely made 200 ft.

The DX-8 works OK so far. I have an extra receiver for each 2.4, but not yet in service. I have about 12 airplanes loaded with 72. I have some 7-8 extra receivers and they will find a plane someday some time. They still fly OK and the best thing is that almost no one in a 100+ member club along with numerous events, I have no trouble getting the needed pin. I think it's our young (under 55) people's lifestyle as so many folks just have to have the latest thing no matter what. I don't follow that crowd.

So enjoy whatever you have and P&M to suit, just don't get all upset when some of us start a little something to get some posting moving. I hate electrics, can hardly spell bateryies, but I have won in raffles two electric ARF kits, so while I will never fly one of those things, well I have been kinda' lookin' 'em over a bit. Please don't let that out to the public?

Of course we have had reports of problem all along but i'm talking about problems to the degree that we would consider leaving 2.4.

I have two 2.4 systems neither use lipo batteries one of them is amodule system that I can switch between 72 and 2.4 that is why I know that 2.4 uses less power.

That much is correct, to the extent that the evolution of SSwas sparked by the need for countereasures to interception/jamming of signalling required by military command and control comms. It has evolved from a countermeasure to intelligent jamming into a countermeasure to dumb jamming, i.e., noise (which may originate from intelligent or natural sources), in the comm channel. It is well suited to low power comm systems - a tradeoff to the brute force approach of countering interference by overwhelming it with transmitter signal power. You can enhance robustness of a comm link with power, bandwidth, or time, or some combination thereof. SS does it with bw and/or time, vs more power. More power would work, but has some costs and other unpalpable aspects too. SS doesn't overlay well with existing comm systems that require dedicated (or at least well coordinated ) use of their allocated, rigidly fixed parts of the frequency band allocated to a type of service. There is more to the band allocated within the spectrum to SS comms than a narrow frequency slot, whatever part of the overall spectrum the band occupies - there are strict protocols required and in place, including limits on power output, to ensure that users of the entire band allocated don't step on each other and can share the resource as peers in other regards. It's an alternative to assigning dedicated portions of the band to each user, which requires coordination between users, e.g., temporary 'rights' to a piece of bw by such customs as claiming it via use of the familiar pin board. As others have mentioned, eliminating that custom in itself has probably made a significant contribution to avoidance of interference and consequential mishaps in our hobby.

Again fwiw, frequency hopping is a subset of SS technique. Not materially different from the other most commonly used SStechnique of time division. A gent named Fourier tells me the two are equivalent, and he devised a transform algorithm to conveniently switch aspect from the frequency domain to the time domain. Go argue with him, I'm getting weary of this.

+1 Cj,

there is one particularly belingerant poster adding a lot of noise and posting untruth and defending vigorousy. Tiresome.

There is nothing wrong with the 2.4 band. Its how the hardware plays with each other. RC is a small user group in that band so if things do become tight we could get kicked into touch and have to find an alternative. For now, for most it works just fine.

+2 CJ

It is not particularly helpful that hearsay and faulty inference is being presented as worthy of conclusion - for example noting that Spektrum led Joe Nall crashes until this year when Futaba took the lead. Well, spektrum was first to market and very likely had many more units flying than futaba in the early years.

Regardless, without knowing the following

- Number of flight minutes on each system
- Historic crash rate per flight minute of each system
- Standard deviation of crash rates

Drawing any conclusion based on a relatively small number of crashes associated with a particular radio systems is impossible.

Confounding this is the fact that RC airplanes crash for a multitude of reasons, post-mortem analysis is frequently inaccurate, and there is a behavioral bias towards blaming radio systems.

So, I find the indictment of 2.4 a fail - scientifically and empirically. That said, if something better is in the pipeline great and if you prefer 2.4 or 72 then fly your preference.

Ok them Im going to keep my (3) 2.4 systems lol.. I have 2 Futaba 7c 2.4 and a Hitec Eclipse 7 with the 2.4 module.. I havnt flown any of them yet. I was selling my 72 stuff to get more 2.4 receivers. I had an add on rcu I was selling my hitec 72 Rx'es But now Im going to keep everthing.. I had awhile back A DX6I.. the plane went in on it's madin.. Brown out after brown out. To this day we dont know why. That scared me new plane new 2.4 system the whole ball of wax. So I went back to 72 then. For some unexplaned reason I have bad interfierence issues with 72 meg.. This all came about after a work accident.. I lost my right pinkey Tore my right shoulder up.. Broke my neck.. They plated me from c3 to c7. I asked my doctor if this has any affect on flying rc planes He didnt know haha.. I do know I can't get near a 72 system w/o either locking up the system of serious servo glitching.. So I was forced to go to 2.4. Get this I can hand off the 72mhz tx to my g/f and all is well. go figure.. I have been flying rc since I was 8 never had any trouble with any radio.. only after the operation and plats in my neck.. I also have pins and rods in my lower back.. Any ideas on this topic ?? I even called futaba about this issue.. The tech said it can happen I may need to go to 2.4. When I ask about this Im looked at like I'm crazy.. But when the other guy's see it they say right off the bat that I have a bad tx. Hand it off to someone else and it's fine. I havnt even flown this year workmans comp are dogs. I have been off work since Dec 4th 07. I can't look up because of my neck now.. I cant hold the plane due to my right hand.. So I have had lot's of time to try to get my life back to where it was before the accident. I just dont want to get out my 45 50 cc gasers and lose them due to radio porblems again.. I know this is off topic but you guy's are all in this hobby so I figure I would just throw this out there.. I mean we are all here to help each other right..

I see, then they do use less. Not sure why.

I don't know if the metal inserts in your body is the cause but it is possible. Have you had the radio checked out?
Do you suffer from uncontrollable muscular spasms? trembling?

That is the point, most is not good enough. It needs to be almost all. If it is getting worse as some say then the AMA needs to get started.

Yet it came before?  Hmm.  Frequency hopping can be used on 72 Mhz. without spread spectrum.  But again would not be ideal. 

I do have mussle spassans tingeling in my arms.. I can't sleep at night either.. As far as the check out on the radio.. I checked it right out of here.. I then bought the first 7c 2.4. I bought it new from tower then had to send it back due to a bubble in the lcd.. But I do have 4 other 72 mhz systems all Futaba. ch 48 and 55. It's crazy I set up the plane on the 72 band walk around and glitch glitch bind. It acts as there is someone else on the same channel as me.. But I do have a scanner and on any given day no one else is on. Heck no one is on where I live.. But when the plane does this I hand the tx over to my girl and she can walk out of sight with no trouble at all. Then she will walk back I walk in between her and the plane full down and or full left or right aileron. I mean a full lock. It has striped gears because of this.. I take you have heard of this ??

Nothing mand made has a 100% reliability record.

Poijtis 2.4 is better than FM in a much more crowded RC environment. Suggestions to go back to 72/35MHz will kill parkflying (the bread and butter of the hobby currently)

Better systems will come along.That is called progress.

Sorry Sport that post was for Timble.

You guy's ever come across a Futaba 2.4 that unbinds it's self ? I have had this happen once with the new system.. But that was the one I sent back to tower.I bought anothr tx for a back up. Then tower sent me a new system.. Im just having no luck at all with anything l8tley. And not being allowed to fly because of comp sucks bad.. By the time I do get a chance to fly all of my warrinties will be out of date lol..

FWIW I am looking to buy a 2.4 Mhz system. Even If the problems are getting worse, I suspect it will be a long time before we whould have major issues.

I would not suggest going back to 72 Mhz, unless we recieved many of the adjacent channels, and a band adacent to that.But I doubt that would happen.

Well If I keep having problems You may end up with two 7c 2.4 and two receivers. I'm all but ready to give up the hobby.

We just finished a top flite 60 p-40 arf.. Robart retracts and everybody.. That is on the Hi-tec 2.4 I put an Enya 120-4c in that.. I dont want to lose this one.. It may be small but lots of $$.. I think I have more in this plane than my 27% cap 232 gasser. Also on hitec 2.4. I don't want to go back. I want to fly my new 2.4 stuff w/o to much trouble.. I guess I wolnt know till We settle the case soon I hope. I got the itch to fly.. I want to bore some serious holes in the sky.. I will send pic's to anyone that wants to see it.. let me know and thank you guy's for the info.. Another reasion rcu rocks..

I'm sorry. Did I just wake up in 2007?

I think so bud lol!!

To get a 200 Km line of sight with say a 50 foot high transmitting antennathe receiving antenna would have to be 10000 feet high. And they sure as heck aren't using commercial RC gear.

No the AMA has no control over the FCC, but has a big say in the matter in what radios hit the market for our hobby. When the FCC says enough, the AMA will push even harder to get the new 2.4GHz replacement out so they can be compliant with the FCC. The FCC decides what frequencies (band spectrum) we use. When the phone companies start to complain because they want to use higher channels, the FCC will notify the AMA to make changes. The AMA is aware of that, so they are already working on the new radios to replace the 2.4Ghz band. The 2.4GHz radio's that we use in this hobby will be a thing in the past soon enough I was told.

No, GSM, Cell and TDMA is now obsolete, they are now on the G band. Most all landline cordless phones and Baby Monitors work on the 2.4GHz. BlueTooth and wireless phones and wifi also works on the 2.4GHz Some phones use the 5.8GHz but it isn't common, most are on the 2.4GHz for now. Most all indoor wireless networks operates on the 2.4GHz band.

What people call Cell Phones are really wireless phones. Cell Phones are satellite connected and they are bulky. Most people who haven't worked for a phone giant like I have makes that misconception.



Pete

Yes this has happened to me once. Ibound a Rx to the Tx using a battery that had no capacity remaining i.e. it was too low on voltage.
The Rx unbound. I repeated the exercise with a fresh battery and it bound nd has remained that way ever since.

Warbird, I have had experience of surgical implants affecting radio transmission.
One incident was in a EMI testing facility when a colleague walked in while the facility operators was calibrating the EMI chamber.Everything went haywire.
the other was at a flying field when a woman with large implants stood beside her husbandin front of a mate of mine while he was flying his plane. His plane started glitching but recovered after a few seconds.

Standing joke : Planes a glitching, b*lls are itching...