Independent tests prove lack of frequency hopping with XPS

[nordqk]

Kiwi says:

However our biggest thanks goes to Metageek and Ryan Woodings who have sent a scanner so we can record all we do and post the files here on FG. All you will need to do is download the veiwer from their site and you have exactly what I get. I cant thank these guys enough for jumping in to help us here.

I just received my WiSpy from the folks at Metageek and the unit is awesome. I'm checking out a 10x with DSS module and DX7 to see how they play with each other. Interesting, the 10X w/module has a 10 dBm lower signal strength than the DX7 for the same distance. It's going to be a real help in monitoring the airspace when there is a lot of 2.4 gigs flying around. I also will be able to check out Tx problems without having to send it in and wait.

It's amazing how much 2.4 gig cr@p is floating around out there.

[Kiwi]

Nordqk,

That last statement is one that I dont think too many realise is an understatement. Its a very crowded sky out there, you just cant see how much without something like this tool.

[XJet]

	Quote: Originally Posted by Kiwi
	Nordqk, That last statement is one that I dont think too many realise is an understatement. Its a very crowded sky out there, you just cant see how much without something like this tool.

You think there's a lot of crap at ground level -- just take a look from 100-feet or higher and your jaw will really drop!

What's worse, the noise-profile at altitude is often *very* different (ie: worse) to the noise profile at ground level (due to the shielding effects of ground-clutter).

When you see just how many extra 2.4GHz sources become visible with a bit of elevation/altitude, you realize just how important frequency redundancy/diversity is to a robust 2.4GHz RC system.

And now (with XPS and its bi-directional protocol) we even have relatively powerful 2.4GHz transmitters flying over our heads.

We live in interesting times

[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.