Independent tests prove lack of frequency hopping with XPS

[JAS]

I saw and asked the same question. I was told, it's not for a satellite antenna, but for updating the rx if the time comes. I stopped asking after that cause I wouldn't know what to ask or where to go asking after that. And the satellite rx in the pic is part of my friends Spektrum set-up.

[RH1N0]

The simple reason why the OEM board in the XPS is designed not to immediately change frequency as soon as it sees another transmission on its channel is because that would happen every time a frequency hopping signal passes by

Just thought it was worth a mention for those who are learning about this technology.

[ricoalonso]

XJet,
Anything from your test results yet? Or, if you had published it somewhere else, can you give us the link or location in here?

Thanks,
^R^

[XJet]

I'm in the middle of a major workshop refit at the moment so it'll be a couple of weeks at least.

[3ddd]

haha kind of sounds like jd now.it was going to be right after the first wasn't it?

[exeter_acres]

LMFAO!!!!!!!!!!

Priceless!


You were just going for Wayne's burger thread weren't you! Right O! Well done!

[50%plane]

	Quote: Originally Posted by XJet
	I'm in the middle of a major workshop refit at the moment so it'll be a couple of weeks at least.

ROFL!

[Neogenesis]

	Quote: Originally Posted by XJet
	I'm in the middle of a major workshop refit at the moment so it'll be a couple of weeks at least.

That's disappointing. Your credibility is declining by the day. Why promise something when you can't deliver?

[Kiwi]

Gents,

Just so this does not go off the rails we (FG) have been loaned some scanner hardware so we can go for broke on this 2.4 Ghz skipping , hopping and multi user on the same band stuff. I wont and cannot stick up for Xjet yet but its not freezin ar$e winter down here where you have a ton of time. This is mid summer holidays and if things are being done its balls to the walls time in this hemisphere. They guy said he is going to do it. We will do it here on FG as well as soon as our hardware arrives and in my case that will be three weeks or more before I have it all.

Once its all here I promise you we can work this 2.4 Ghz stuff to the death knell. But it takes hardware, time, facilities and effort to get it all together and this being the mid summer break for us, some of those things just are not available.

Its 4 days into the new year so sit back and wait a while. No ones being paid to do this, its a passion and the guy wants to demonstrate something everyone can understand. I dont care if it takes three or four weeks more, so long as its done right and in a fair and equal manner for all parties concerned.

[jonkoppisch]

I agree with kiwi! Their comparing xjet to jd, where as jd is making $ off of this and it's his full time job/business & still takes months and even over a year to get things out. Xjet is working a full time job and trying to get this done on the side (while hopefully getting a little flying in)

Jd has had over a year to get his stuff out and still hasn't. Definitely not to much to ask for a couple of weeks or even a month to get it done right...

[exeter_acres]

but the originator of this post came in with claims and no proof... promise of proof.. yada yada...


Oh hell...why do I care or bother....



Enjoy

Kiwi... we are looking forward to your info without claims on the front end!

[Flatlandman]

Who's the pot and who's the kettle?

[50%plane]

Kiwi, I appreciate the quest for info, but I have serious doubts about Xjet's credibility.

IMHO, it appears that he has something against JD, or XPS. Whatever it is, I tend to believe that the results from the testing would not be as accurate as they could possibly be.

With all this being said, I do not profess to be an expert, nor would I even come close. Additionally, I sincerely hope that I'm wrong.


50%

[Kiwi]

Guys the only thing Xjet has said is XPS does not skip when hit by a sudden 2.4Ghz source. JD has acknowledged that and agreed that XPS does not hop frequencies if the hit is strong. It may skip if the intrusive interference slowly builds up and that is what Xjet is trying to prove for us now. But the fact is 100% agreed between XPS and anyone who asks them. XPS does not frequency hop if the saturation levels are sudden. So you get shot down if something close turns on or if you fly into a area with heavy traffic. THOSE ARE FACTS, THERE IS AGREEMENT BETWEEN XPS AND PEOPLE TESTING THE SYSTEM.

FACTS!!!!! XPS DOES NOT HOP IF THE HIT IS SUDDEN AND STRONG: Case closed.

Now what XPS wants to see and show us is will XPS skip at all if the levels of band use increase slowly, or how slow does the band width use have to increase before it will hop to a clean freqency.

Thats not easy to do as first of all you need a clean environment. Today that pretty much means a bunker or some place totally free from any 2.4 Mhz signals. Thats hard to find.

Now once you have your basement or bunker clean you need to introduce a source of supposed interference but this must be manageable and controlable. For instance you have your XPS Tx and Rx operating on say Channel 6. Now you need to slowly introduce a signal source also on Channel 6 and slowly increase the power until either the XPS hops to a new frequency or locks up.

Its not just a simple turn the radio on and see what happens if Joe Blow turns on his radio beside you. Xjet is a professional in the radio industry. Its his living and I am sure he is doing this correctly but its not five minute test with a quick answer. Its down right difficult but the results will be worth the wait.

As the guy has already stated. The purpose of the test now is to see if XPS hops at all under supposed advertised conditions. That is a gradual rise in noise (2.4) on the selected frequency until it either hops or locks up.

Thats the test we are looking for. We need not prove it does not skip under a very noisy environment. We know it does not. Jim Drew says it does not and they are working on some new software to hopefully make it hop if the environment that it is operating in gets too rotten to stay in.

Simple. Nothing new, just trying to see if the product does what the manufacturer says it does. Because up until here it does not appear to hop frequencies. So lets prove it, one way or the other.

[XJet]

Okay guys, I can see that I'm wasting my time here.

I was planning to test this stuff in my own time, at my own cost, for the benefit of others.

There's no benefit in this to me -- I don't sell RC gear, I don't even service the stuff. I don't give a rat's *ss which is best, worst, flawed or perfect -- I just thought most others might be interested in some objective, researched and tested facts about each of the systems currently on the market and some clear indications as to what XPS will and won't do in adverse conditions (such as those *any* model may encounter at *any* time, without warning)..

It's rather disappointing to see that just because I also have professional commitments and a need to put bread on the table, some people choose to criticize the fact that I'm not giving this my full attention and making it a first-priority. Of course I'm sure that all those who criticize would take time off their job and model-flying to perform such tests themselves if they had the necessary skills and experience, wouldn't they?

I've just come in from a very long day (6am start, 5pm finish) and I'm tired -- reading complaints that my altruism isn't up to expectations is last thing I need right now so I've decided it's just not worth the grief.

I *was* more than happy to invest my time, effort and money when it's appreciated but quite frankly, life is just too short for this kind of garbage. It strikes me that there are some people here who'd complain if you gave them a $5 note -- simply because it wasn't a $10.

Right now, instead of going back to the workshop tonight and doing some more on the 2.4GHz test-rig I was building, I'm going to put my feet up, drink a beer and then have an early night. Tomorrow I might even do some flying.

Testing 2.4GHz RC gear? Sorry guys, I'm no longer interested. If the XPS fanboys wanted me to stop uncovering flaws in their object of worship, then congratulations.

I trust everyone will enjoy their 2.4GHz experience (with whatever gear they use) in blissful ignorance of just what's going on beneath the wrappers of their RC gear and what (if any) weaknesses or strengths that gear may have in "the real world".

Now we return you to your regular program...