Independent tests prove lack of frequency hopping with XPS

[Kiwi]

Tony

I have to whole heartedly agree with you and thats why I am moderating this forum like a hawk. I dont want it to go off the rails as there is a lot of knowledge being shared here and everyone at least has the right to observe and ask Xjet questions as we go.

On a side note but intersting just the same I was taliking with someone last week who is feild testing the FASST system on a high end Futaba radio. At his field they had a spectrum analyser running and also had some Spektrum radios operating. He was telling me how you could clearly see the two channels the Specktrum had locked into and when you turned on the FASST system you could see it pretty much black out the screen as it checked and skipped channels at light speed.

I´m sure once FASST becomes mainstream next month there will be tales of disaster and issues until people become accustomed to them.

In the mean time I am sitting back, watching and patiently waiting for Xjet to show us how the XPS system works and any issues it may have or not have.

[3ddd]

xjet i must say you finally gave me something i can bite into other than just(i ran some test)thankyou and keep going,i am still listening

[sweetpea]

Very good posts Xjet......

With the way you described the your test though, it doesn't appear to lend to freq hopping. It more sounds like you saturated the spectrum, it also doesn't say that you had a device to see if it actually hopped. Maybe it hopped to the next adjacent freq which also was covered by the device as far as power and harmonics. I wonder if FASST or Spektrum would have failed the same way in this test.

Because the important part of this to me is a feature that stands out....If it is hopping and it doesn't help I'd like to know. If its not, hopping but all the other 2.4 systems fail in the same test.....that's not great news but then you are no worse off than any other system . And lastly.....how does each system react in this scenario....immediate failsafe or sluggish controls than failsafe etc...All of this will help people decide which unit is better for their needs

I don't doubt that you got the system to fail.....I just question why it failed and if any of the other systems would have done any better in your test.

I'm really looking forward to more of your testing in the new year......And post some more on how you setup your test and what your looking to accomplish.....not everyone online has no experience with electronics and radio freqs so the data and technique are just as important as the results only

Its a shame I don't live anywhere near you as I'd lend my equip to the test....72mhz, Spektrum and XPS (sorry don't own a futaba radio)

[Kiwi]

	Quote: Originally Posted by sweetpea
	....not everyone online has no experience with electronics and radio freqs

But I bet you your last dollar that there are a darn site more who dont know than do. There are also a whole lot who know enough to be dangerous.

Thats why its good to sit back and let the man show us what he found and in a manner that the dont knows will soon know.

[Chris]

	Quote: Originally Posted by gmilo
	I for one lost faith in X-link when JD claimed that the 1st delay in introduction was due to a delay in receiving plastic receiver enclosures from the Asia supplier that 'were in transit'.....this transit time turned out to be about 6 months. Just a bold face lie IMHO that I didn't appreciate as a reasonably intelligent consumer. When I go 2.4, it will be JR or Futaba, but not XPS

Same here. It was delayed too long. And anybody with 1/2 a brain knows it wasn't because the freight ship got lost in the middle of the ocean.

Then--when they FINALLY got some inventory--I couldn't buy it. They had issues with the shopping cart. The rumor was that somebody had gone in and placed thousands of units in their cart--thereby making all the inventory "spoken for" and unavailable to the rest of us.

I find it positively amazing that a guy with the knowledge to design, build and manufacturer an RC system such as this, cannot get a simple website shopping cart set up correctly. It's total BS. Something fishy was going on. Having a shopping cart and internet commerce system set up to make purchases and collect money is not rocket science. It's not new technology either. But for some strange reason, XPS couldn't figure out how to sell their product after it arrived in the states.

Ummmmmmmm, no thanks. I tried to buy it when it had been here and available for just a few hours. But, THANK GAWD!!, I couldn't purchase anything because of the shopping cart snag.

I'm now a happy user of Spektrum.

Just do a google search for JD and read all about his past business ventures. Read about how he sold business' in the past and left users high and dry when they needed support and warranty work. Read about his prior delays with regard to getting products available for the market. Read about the delays and the broken promises. Read about the claims and then about the REAL facts about what his products could and could NOT deliver.

Makes no difference now weather XPS works or not. I wouldn't buy a square of toilet paper from that guy if I was stuck on the toilet in a public bathroom. I'd rather use my finger. At least I could wash that off when I was done and get on with my life.

Did I sugarcoat anything?

[KrisW]

	Quote: Originally Posted by Chris
	Same here. It was delayed too long. And anybody with 1/2 a brain knows it wasn't because the freight ship got lost in the middle of the ocean. Then--when they FINALLY got some inventory--I couldn't buy it. They had issues with the shopping cart. The rumor was that somebody had gone in and placed thousands of units in their cart--thereby making all the inventory "spoken for" and unavailable to the rest of us. I find it positively amazing that a guy with the knowledge to design, build and manufacturer an RC system such as this, cannot get a simple website shopping cart set up correctly. It's total BS. Something fishy was going on. Having a shopping cart and internet commerce system set up to make purchases and collect money is not rocket science. It's not new technology either. But for some strange reason, XPS couldn't figure out how to sell their product after it arrived in the states. Ummmmmmmm, no thanks. I tried to buy it when it had been here and available for just a few hours. But, THANK GAWD!!, I couldn't purchase anything because of the shopping cart snag. I'm now a happy user of Spektrum. Just do a google search for JD and read all about his past business ventures. Read about how he sold business' in the past and left users high and dry when they needed support and warranty work. Read about his prior delays with regard to getting products available for the market. Read about the delays and the broken promises. Read about the claims and then about the REAL facts about what his products could and could NOT deliver. Makes no difference now weather XPS works or not. I wouldn't buy a square of toilet paper from that guy if I was stuck on the toilet in a public bathroom. I'd rather use my finger. At least I could wash that off when I was done and get on with my life. Did I sugarcoat anything?

Not at all. . . want to borrow some clover honey?

[sweetpea]

And I thought we were going to keep this civil.

[Chris]

	Quote: Originally Posted by KrisW
	want to borrow some clover honey?

Sorry Kris, I don't know what that means.

I have no interest in the XPS system, so the results of XJet's testing really don't matter to me. Just had to point out, or joggle some memories, with regard to all the problems in actually getting this product to the market. And I would encourage anyone thinking of purchasing one of these systems to do some research on the company before buying the product. You might need warranty work some day.

I have no doubt that if I ever need service on a Spektrum product, all I have to do is ship it to Champaign, IL. with a brief description of the problem. Weather it be next week or in 10yrs from now, I'll get it serviced if it ever needs it.

I'll stay out of this one from now on. Carry on gents.

[Kiwi]

All Righty, back on track guys.

Dont take sides on this one. Lets see if we can get some sort of independent and obvious well intended analysis done here.

In another thread someone asked why we could not have some sort of product assurance testing done by members. Here´s a chance to prove we can be independent enough and mature enough to test a product and get an unbiased result.

[sweetpea]

I'd also like to point out.......XPS does not warranty their system any longer......

The limited lifetime warranty has been replaced. Sorry to say............

It is now a Lifetime warranty with no strings attached. You step on it, crash it , it fails etc they won't fix it.......they simply replace it with a new model!

I for one like that idea alot better than getting my problem back.


Kiwi--keep up the good work moderating this one.

[madmax]

This whole thread is based around tested data however we have yet to see any, and it's quickly creeping into the realm of bashing. XJ, I know it's the holidays, but any chance you can get the person with the data to post here?

[XJet]

	Quote: Originally Posted by sweetpea
	Very good posts Xjet...... With the way you described the your test though, it doesn't appear to lend to freq hopping. It more sounds like you saturated the spectrum, it also doesn't say that you had a device to see if it actually hopped. Maybe it hopped to the next adjacent freq which also was covered by the device as far as power and harmonics. I wonder if FASST or Spektrum would have failed the same way in this test.

No, if the 2.4GHz spectrum *had* have been saturated by the video transmitter, the XPS wouldn't have worked even when it was turned on *after* the video transmitter. The fact that it *did* work perfectly fine if it was turned on after the video indicates quite clearly that XPS was scanning the spectrum at startup and thus avoiding this "interference" but could not cope with it the interfering signal appeared *after* XPS had selected its operating channel.

If the band were saturated, the turn-on order would make no difference and XPS wouldn't work at all in either case.

	Quote:
	Because the important part of this to me is a feature that stands out....If it is hopping and it doesn't help I'd like to know. If its not, hopping but all the other 2.4 systems fail in the same test.....that's not great news but then you are no worse off than any other system . And lastly.....how does each system react in this scenario....immediate failsafe or sluggish controls than failsafe etc...All of this will help people decide which unit is better for their needs

I would like to do a range of tests on all the current offerings but time and money (or the lack thereof and the need to earn some by working for a living) prohibit that right now.

I do have an iMAX 9-channel system here that I'll be taking a look at -- it seems pretty similar to the ASSAN unit except that it comes with a satellite receiver as standard. It's not all that small or light and appears to lack any failsafe capabilities so it's probably not a real contender for much other than .40-.90-sized sport planes however.

	Quote:
	I don't doubt that you got the system to fail.....I just question why it failed and if any of the other systems would have done any better in your test.

There will be some spektrum and FASST gear around here at some time in the next few months (visiting fliers) so I'll try to "borrow" some gear to do those tests. I'm pretty sure that Futaba will have no problems and I'm picking that unless Spektrum is unlucky enough to choose two adjacent channels (which I doubt) it will be fine also.

	Quote:
	Its a shame I don't live anywhere near you as I'd lend my equip to the test....72mhz, Spektrum and XPS (sorry don't own a futaba radio)

Hey, I always welcome visitors, if I'm not up to my eyeballs in work :-)