Independent tests prove lack of frequency hopping with XPS

[Mitsu1]

Is there any way to tell if you have a Spektrum RX (AR7000 & AR9000) thats was made after the July '07 "Faster Reboot" update? Were there any AR9000 rx's made before this update, or are all AR9000's quick reboot?

[erichevy]

O yeah,
I would like to know that too! I just orderen 3 of the AR9000 recievers from Spektrum.
I already had one from which I had to glue the electrical part tight...

Eric.

[rede2fly]

yuo know its too bad that most people wont listen to someone when they find out things that are bad. case in point last weekend at the field one of my fellow flyers is using this xps crap. i told him to come to this site and read this thread to gather more information on his system of choice. he said he didnt have to because he has not had any problems with his xps system and that none of the 2.4 hops from signal to signal.i told him okee dokee. today when i showed up at the field he tells me his sd 33% extra with a da 85 went into lock out and all he could do was just watch it splat into the ground. now if he had read some of this stuff he may have changed his mind about it,but like so many people they get something into thier mind and the door is slamed shut. now he is swearing off the gas planes and says he is going back to the small glow stuff. that the gas is too much to burn into the ground. what is your point are you asking now.. point is. dont close your brain off. too bad we lost a good flyer to this never glitch, never get a hit, frenquncy hopping everthing is great system. i for 1 thank xjet for this information, and your time and effort. and i dont even fly the 2.4 and not because iam "too old to accept anything new" because its just not proven yet. now ill shut up and continue to read we shouldnt have to put 12 or more antennas on a plane to get it to work

[west-wot]

just found this on another site

XPS announced 900mhz is coming


http://www.runryder.com/helicopter/t399636p1/

[DC Gayhart]

I heard XPS was going to roll out their 900MHZ stuff in Pasadena. Has anyone there seen it?

[3ddd]

yes the 900 is out,it is a high end (expensive system for more advanced stuff,what i was told today.jim is not going to dump 2.4 down the tubes and is going to keep upgrading it.i was also told to go around the corner to peak electronics if i wanted an xpd .the dumb a---- over there didn't even know what they were selling iwas told straight out he had no clue what i wanted.went to ems (the other xps distributer and was told he never even got any for the show.what a joke i drive 50 miles round trip for one thing and they were gone on friday .any one know of a good futaba store

[rede2fly]

	Quote: Originally Posted by west-wot
	just found this on another site XPS announced 900mhz is coming http://www.runryder.com/helicopter/t399636p1/

thats just what we need. something else. well why not, they cant make the stuff work correctly now, might as well put something new out there how many antennas you reckon we will need for this system. and drag up a 12 volt car battery yea. got to love it.

[Kiwi]

Maybe I'm a tad out of whack here but I know you cant buy a transmitter or a receiver (cell phone scanner / jammer) legally as its all tied up by the telcommunications giants.

Sure I suppose you can get a license and all that stuff to do it but I figure your talking some serious coin when you want to take on those boys for some band width. They tend to have bottomless pockets when it comes to defending their airspace.

[canavanbob]

Boy, you must really have done a lot of research to be so well versed in 2.4 technology, thanks for sharing this valuable information. I will be on the lookout for 12 volt car batteries on planes when I fly.

[bgold]

I realize I'm probably way late with this question but what are the sources of 2.4 interferance that will cause trouble.

Bill

[Kiwi]

Bgold.

I`m no techo on this stuff but broad band WiFi internet, some cities and large towns are setting up enormous coverage systems so your wireless from where ever you are.

Wireless video systems are nearly all 2.4.

Bluetooth phones

Microwave ovens

Car radios with wireless systems built into them

Wireless stereo systems

The military

Mate the list is endless. Baby monotiring cameras and sound systems.

Some wireless remote controls for high end TV's and sound systems

List is really endless as its an open slather frequency.

[zoomer260]

Cordless phones and video cameras that I know of, I sure these guys can list many more.

[sweetpea]

2.4 video camreas in close proximity (100yds or less)
2.4 signals in general, if the power and density are great enough to create a rise in the noise floor. Then you don't get interference like 72mhz but you get a decrease in the ability of the signal to reach the RX or vice versa. Since our 2.4 sends packets of data (similar to how the internet works) if not all the packets are recieved then you get frame losses. Enough will cause a drop out ending in a failsafe condition or sluggish controls

[USN_POPS]

What has beenn ignored in the discussion is that each transmitter on 2.4 MUST have a unique GUID and the binding process tells the receiver to respond only to signals that are ID'd with that GUID.

Which is why Fuaba seems to be having some problems, they had some transmitters get programmed wit duplicate GUID's and if thy are both in range of each other, BUMMER!!

I have a 2.4 GHZ phone System, 2 2.4 Wireless systems for computers, and of course my 2.4 model system. I have put the phone antenna right next to the planes antenna, and it was ignored.

It takes a flooding of the entire 2.4 freq range to cause any of the systems to quit. And that is much more rare than is indicated in these forums. No radio transmission is totally free from interferance at some time or another, and from some types of transmission. But Spread Spectrum is as close as we will get in my lifetime. And 900 GHZ is even more selective as I have read.

[rede2fly]

	Quote: Originally Posted by canavanbob
	Boy, you must really have done a lot of research to be so well versed in 2.4 technology, thanks for sharing this valuable information. I will be on the lookout for 12 volt car batteries on planes when I fly.

dude you totaly miss the sarcasm. sorry my fault, my bad.. ill stick with blond humor next time. dont want to confuse anyone