Independent tests prove lack of frequency hopping with XPS

[budgetdude]

How can that f..king be legal??

[buttface]

	Quote: Originally Posted by xed
	Well in theory, if you a real *!(@$(^, you can buy a $50.00 Hobbico frequency scanner with an external antenna from pretty much any hobby store and sit behind a bush with a 72MHz synthesizer capable transmitter and pick off planes and helis at will...

They would have to be a jealous sick minded individual with too much time to do that! lol
Or just someone that built a new home next to the 25year old club field that cant stand to hear r/c planes. We have suspected this of happening at our field.She is a house wife that is a little cookie.She alway complains we are flying over her house several times a week.Cops would show up and tell us not to.One day I had a cop follow me in and hide where she couldn't see him.I fired up my plane and guess what.He drove over to me an said he got another complaint that I was flying over her house.I was the only one there and I hadn't even flown yet.
After that day the cops would write her off as a false complainer and ignore her calls.It was great! Finally we had Peace ! Until planes began to mysteriously fall from the sky at the next funfly on 72mhz. .One by one 5 of them where hit that day.After that day many other planes where killed.I lost a plane every time I came out along with several other guys.
Every one is on 2.4 now.I hope see doesn't shop on E-Bay!!!

[klhoard]

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Is that a cell phone jammer?
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[sherman89]

I do not know about the frequency hopping but I do know I lost a 33% Extra with A Da-85 to Rx lockout, I have flown the XPS since May of 06 without any problems until last Thursday. The Rx went into lock out, I watched the plane go through 4 slow circles over the field before it finally met mother earth and totally destructed into a peanut field. I had enough time to call my broker and sell my shares in the airplane company before the plane crashed. What a sick feeling, now here is the rub, everything checked out after the crash, both airborne pacs and switches and servos all worked fine, go fiqure, the transmiter was checked at the time and was showing 10.0volts. No more XPS, I can not afford it!

[jonkoppisch]

Works till it doesn't... Been there, done that.... Sorry to hear about the xtra!

[Kiwi]

Guys thats a simple jammer for cell phones and if you look at the feedback these turds get then they sell plenty of them. Now if your a do it yourself kinda guy go do a google search on 2.4Ghz jammer.

You can buy the plans for $9.95 and build it for 10 bucks using parts from the local electronics hobby supply shop. Now I know thats dooms day bull$hido and the sky is falling stuff. But you cant kill 72 Mhz that easy. It takes brains and money to do it like was mentioned before.

Guys I'm not trying to put the voodoo on 2.4. Its going to be the way things go for sure. Its going to take time, its going to take effort (no such thing as a free lunch remember) and there's going to be normal hard school of knocks getting it right.

There's always a price to pay for success and thats been proven so many times that its indelible in our society.

Anyway lets get on with the testing.

[dick hanson]

	Quote: Originally Posted by Kiwi
	Guys thats a simple jammer for cell phones and if you look at the feedback these turds get then they sell plenty of them. Now if your a do it yourself kinda guy go do a google search on 2.4Ghz jammer. You can buy the plans for $9.95 and build it for 10 bucks using parts from the local electronics hobby supply shop. Now I know thats dooms day bull and the sky is falling stuff. But you cant kill 72 Mhz that easy. It takes brains and money to do it like was mentioned before. Guys I'm not trying to put the voodoo on 2.4. Its going to be the way things go for sure. Its going to take time, its going to take effort (no such thing as a free lunch remember) and there's going to be normal hard school of knocks getting it right. There's always a price to pay for success and thats been proven so many times that its indelible in our society. Anyway lets get on with the testing.

OK- but 72-or 50-or 53 are all easy to kill you can't do it unles you know the freq -or use a spark gen -but you can kill em0 in a heart beat
the 2.4 still done right -is my favorite as around here - they all work VERY well and th new tiny simple rx make the little park flyers sooo easy to do - I love my 2.4 stuf -would'nt go back for the world.

[Mithrandir]

What I want is a Dual Rf on the Tx... one side is 2.4 Ghz and the other is 50 mhz and on the plane I have a Duralite RRS with a 2.4 Ghz Rx AND a 50 Mhz Rx... THAT is the hot ticket!!!

[hillmanr2]

Kris W I agree with you 100% although with the 33 pages I could not find the quote I was looking for.
Problem #1 with 72mhz: you can be shot down by another flyer
Solution: there isn't one, wait a minute, Polk hobbies introduced this years ago, scan the 72mhz band before transmitting anything. That would be way to simple, thank god for 2.4

Problem#2 with 72mhz: Plane generated RF noise.
Solution: keep your RX at least 12 inches from the ignition and setup your plane properly

Possible problem #3: low voltage cutoff
Solution: With 2.4 this potential problem has come to light, thank you 2.4

Thank goodness "technology" came about

2.4 only has a limited amount of problems

Problem #1 with 2.4: loss of reception
keep your antenna pointed away from the model, don't let any liquid, carbon, thick foam, hills, trees, or another human between you and your "robust connection"
Solution: fly in a remote location

Problem #2 interference: stay the hell away from some cell phones, blue tooth, video transmitters, microwaves, cordless phones, cellular towers, radio beacons, xps users, spektrum users, fasst users or anything else on the crap frequency of 2.4 Solution: fly in remote locations well away from an urban environment

Problem #3 low voltage reboot: 2.4 operates differently than 72MHz and sends a greater frequency of signals to the servos causing them to correct more often, this then causes far greater power loads unless the first 2 problems get you.
Solution: understand this concept and realize the same thing was very close to happening or has been happening consistently with 72mhz only it was not as apparent.

All I know is thank you for the marvel of having the option to change to a more used and uncontrolled frequency! I can only assume as more and more people change to broadband wireless communications and rouge offshore companies produce 2.4 clone machines that things will obviously become more favorable
for my modeling investment!

I have read all 33 pages, xjet, thank you for opening up all the flaws of 2.4 to those of us who have been mislead due to our own ignorance. I do not a 2,4 system yet and I am glad I have not put down hard earned money for one. I had obviously incorrectly assumed that GUID codes would stop interfering signals on the same band. They obviously do not. I do not have an understanding enough of the way 2.4 works but if I can be shot down by some guy on a computer a block away(perhaps overly simplified but more than plausible), I will take my chances of being shot down by a fellow modeler anytime, especially here in Canada where frequency boards and operations are standardized across the country and shot downs are extremely rare.

[hillmanr2]

Sorry for the grey area off topic rant, 33 pages made me late for bed and irritable

[3DDevil]

	Quote: Originally Posted by sherman89
	I do not know about the frequency hopping but I do know I lost a 33% Extra with A Da-85 to Rx lockout, I have flown the XPS since May of 06 without any problems until last Thursday. The Rx went into lock out, I watched the plane go through 4 slow circles over the field before it finally met mother earth and totally destructed into a peanut field. I had enough time to call my broker and sell my shares in the airplane company before the plane crashed. What a sick feeling, now here is the rub, everything checked out after the crash, both airborne pacs and switches and servos all worked fine, go fiqure, the transmiter was checked at the time and was showing 10.0volts. No more XPS, I can not afford it!

Identical to my crash... only a 90 size extra... all checked fine after crash... works fine till it doesnt... no more XPS for me....

[klhoard]

	Quote: Originally Posted by Kiwi
	. .<snip>. . . Anyway imagine if litlle Johnny turns up close to the field with this puppy in his Tit pocket.

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Kiwi,

Are you or XJet in possession of one of these cell phone jammers? Do you guys plan on adding one of the commercially available models to your testing of the 2.4 systems?

All you need is some guy who hates to hear people talking on their cellphones show up to a fun-fly with one of these things. . . ugh!!

Is there any way we can make a Spread Spectrum system on 72Mhz? Perhaps set aside all of the odd channels or go in-between the current channnels?