Independent tests prove lack of frequency hopping with XPS

[XJet]

It's interesting to note that JD is now claiming he's written "millions of lines of code" during his software career.

This makes him a true God amongst men, since the industry-standard productivity for a good programmer when presented over the entire development cycle of a product is a mere 5-7 lines of code per hour.

This means that a good programmer would have to work continuously 24/7 for over 16 years to write just one million lines of code -- and JD's done several times that.

Does the man never sleep? Is he a super-programmer, the like of which we've never seen before?

Or could he be just full of BS?

Readers can choose their own answer ;-)

[sweetpea]

Xjet........there you are totally wrong.


I myself have written tons of code for products since I started in computers years and years ago. Maybe not quite a million but it is up there.

a million lines of code is not that big a deal actually and wouldn't take a lifetime to create. Video games are twice that. Keep the thread on topic please and keep your dislike of JD out of this.

Remember XPS is not just JD but Scott as well. JD just happens to be the spokesperson online

[socalsal]

	Quote: Originally Posted by XJet
	It's interesting to note that JD is now claiming he's written "millions of lines of code" during his software career. This makes him a true God amongst men, since the industry-standard productivity for a good programmer when presented over the entire development cycle of a product is a mere 5-7 lines of code per hour. This means that a good programmer would have to work continuously 24/7 for over 16 years to write just one million lines of code -- and JD's done several times that. Does the man never sleep? Is he a super-programmer, the like of which we've never seen before? Or could he be just full of BS? Readers can choose their own answer ;-)

Hi Xjet, tell me please, don't you think you have attacked this JD fella enough? You have made it very clear that your testing of his system does not do what you say it should do based on J's adds. I understand that you are very good in this testing field ( much better than I) But to continue with your bashing of this guy is just plain wrong don't you think.?
If I'm not wrong you are trying to develope your own design 2.4 based on the "Xbee" chip. Suppose you make a claim and somebody does testing and finds out that based on this testing your "claims are not true. Now suppose this other "tester" goes on a bashing mission to put you down, call you names and just plain destroy you as a person. How would you feel??? not good I'm sure. You might even get mad and fire back ( not recommended) This would just start a so called "name calling war".
JD seems to be smart enough not to get tied up with your campaing of personal attacks.

I'm not saying JD or any of his "claims" are true or not. I'm not saying you are wrong either.
But don't you think it might be a better idea to just maybe contact him on a personal basis and try to develop a system based on both of your ideas that would serve the modelers better?
This so called "war" you have declared on JD is now getting to the point that it is childish in my own opion. I would like to see your talents and JD's put to better use. You are well qualified to do some development in this area, but like they say." two heads are better than one".

I feel that you two could come up with a system that would be as good as any other maybe better and make some money for both of you. Right now JD is making the bucks and you are helping him do so with your constant attacks . You see you are making people aware of JD's product just by your actions

Anyhow Xjet have a very good day. I hope you will use your vast talents in a better way from here on out. You have made your point very clear about JD and his product. Time to move on to better things

[Edge 540]

Does an endless Do loop count as infinite lines of code?
I win

[Dustflyer]

	Quote: Originally Posted by skubacb
	Nowhere have a read about or heard about, anyone that can cause a repeatable or testable XPS system failure.

That's why politicians love us voters, we have such short memories.

Here are my videos of repeating XPS system failures:

[Kiwi]

Wow, this one is still pulling traffic and viewers. I'm amazed as I really thought it had fallen off the radar.

Just to reiterate so the facts don't get lost in the jungle of comments here.

My tests were not to prove XPS, FUTABA or SPEKTRUM or ASSAN were good bad or otherwise.

My tests were to see if under the exact same conditions the four systems would function. NOTE!!! Exact same conditions. I did not saturate the front end of any of the three tested devices. If I had done that they would have all failed.

What I done as shown clearly in the video was expose the systems to the exact same noise levels. That is the Rx was positioned in the exact same place from the noise in all three cases. The transmitter was in the exact same location.

The noise was not ever dumped in a solid burst on any one channel. If you look at the scanner you can see the spread was wide enough that as the noise transitioned across the specktrum each channel was slowly exposed. It was never hit with a solid burst such as a video transmitter etc would do.

XPS stopped functioning every time.
ASSAN stopped functioning every time (it should do as it is not sold as a frequency agile system as are the other three)
SPEKTRUM never missed a beat, performed solid all the way through.
FASST never missed a beat, performed solid all the way through.

Now what conclusions anyone wishes to draw from that is over to the individual. I do not say XPS or ASSAN are bad but they do not perform as well as the other systems do. That's a fact, undeniable real world solid fact. But it does not make them unusable. It just means they are not as robust as the two better performing systems.

My feelings as a guy who takes extreme pride in the building, flying and the safety in this hobby tells me that if I want the best and most secure frequency agile system then I should use S or F. But I dont have to, I am not saying dont use the the others. I find ASSAN absolutely great to use in my foamies and fun fly stuff that I fly in the paddock behind the house. But in my high dollar stuff I can not justify using an inferior system that saves me $100 maximum in a model that I have invested $5000. to $7000 in. That's my point.

Fly what you like when you like but if you seriously want to protect your investment and asset I am sure you will not penny pinch when it comes to the most important part. The radio link that lets you drive the thing in the first place.

However it was never ever going to be long before someone else came along with a true FHSS system that will retro fit the big name radios and it is already in testing. Once they get the bugs out of that set-up I hope we can put it through the same barrage of tests the others were exposed to.

After all they are 100% repeatable in the same location with the same devices and instrumentation.

[Woketman]

	Quote: Originally Posted by sweetpea
	Xjet........there you are totally wrong. I myself have written tons of code for products since I started in computers years and years ago. Maybe not quite a million but it is up there. a million lines of code is not that big a deal actually and wouldn't take a lifetime to create. Video games are twice that. Keep the thread on topic please and keep your dislike of JD out of this. Remember XPS is not just JD but Scott as well. JD just happens to be the spokesperson online

I disagree!! I would like to thank XJet for continuosly re-hashing all of the JD hype & BS so that newbies will understand the lies that JD has spouted for the last few years.

Please XJet, NEVER let up. Stay on the attack as many of us appreciate everything that you have done to open our eyes. I just wish mine had been opened before I wated my $$$!

[XJet]

	Quote: Originally Posted by sweetpea
	Xjet........there you are totally wrong.

Nope, I'm 100% right!

I've been in the software industry for over 30 years and I often hear *programmers* say "I can write faster than that" -- until you sit down with them and show them how very few lines they actually write per day when amortized across the entire development cycle.

We're not talking about sitting down in the morning and delivering 500 lines of code by lunchtime - anyone can do that - but it's *not* the whole story.

Once you include the initial program specification, systems analysis, structuring, coding, testing, debugging, etc, 5-7 LOC per hour is a *very* reasonable figure.

	Quote:
	I myself have written tons of code for products since I started in computers years and years ago. Maybe not quite a million but it is up there.

Yes, but you're not including the hours you spent doing the SA, testing, debugging, documenting etc are you? You're thinking "I sat down on Monday and by the end of the day I'd written x00 lines of code -- but was that code totally bug-free, did you include all the prelimary work? Was it properly documented?

	Quote:
	a million lines of code is not that big a deal actually and wouldn't take a lifetime to create. Video games are twice that. Keep the thread on topic please and keep your dislike of JD out of this.

It's nothing to do with my "dislike of JD" it all refers to the man's credibility and therefore the veracity of his claims in respect to the XPS system -- something which I think even you will agree *IS* important.

You are right, many programmers (including me) have cut, tested, debugged and documented a million lines of code throughout their career -- bug JD is claiming millionS of lines -- that's more than a million.

	Quote:
	Remember XPS is not just JD but Scott as well. JD just happens to be the spokesperson online

But JD claimed he'd *personally* cut "millions of lines of code".

What it boils down to is that JD continues to spout BS and that's got to be a worry for anyone considering XPS as a product.

A sound product doesn't need BS to sell it. Just as a good programmer doesn't need to boast about unrealistic productivity or degrees they don't actually have.

It's very seldom that you get top-quality lubricants made from snake-oil.

[capgains]

Yep this is a whole new level of obsession.

[Panzlflyer]

I think that word of mouth has taken care of most Xps systems except for a few poor guys who dont do any research.
"But wait if you order in the next 10 minutes We'll send you 2"
I have yet to see one our way.

[Pale Rider]

	Quote: Originally Posted by Panzlflyer
	I think that word of mouth has taken care of most Xps systems except for a few poor guys who dont do any research.

BUT--according to JD his user base is in the "tens of thousands"

[Simpleton]

	Quote: Originally Posted by capgains
	Yep this is a whole new level of obsession.

There are more than a few posters in these XPS threads who have never posted in *any* other threads here.

	Quote: Originally Posted by Panzlflyer
	I think that word of mouth has taken care of most Xps systems except for a few poor guys who dont do any research.

And ironically, the only place they'll ever find that info is on the web...the same only place that XPS advertises (in the US, anyway).

[skubacb]

- Kiwi, at least you understand the limitations of your testing as some others do not. It was not a test to see if XPS would hop since you did not have the parameters under which it would hop.

It probably shows that the XPS RX is more sensitive, i.e. gathering in more of the signal and noise.

Blanket statements as to what this means is objectionable and unreasonable since there is no data to come to further conclusions.

- Spherical coverage is just that. We are not talking about the antenna pattern which indeed does seem to have a dimple. At the first AMA convention where JD talked about the system he stated that there was a dimple. I worked antenna patterns and coverage in my AF operational testing and a dimple is not necessarily a dead spot. The RX may allow a DB level low enough that you do indeed have spherical reception. Thus is is NOT at all magical.

JD is NOT the person that started this line of BS about an isotropic antenna. Someone else took the advertising and decided to call it isotropic and thus decry the XPS system. For most intents and purposes all our planes systems have spherical coverage. Otherwise we would all have aircraft that would fail to respond in depending on the a/c angle to us. No not magical at all, just advertising.

- I believe my number of successful flights is important considering that some people have posted that they could never get the system to link and that it was an XPS problem. I have had 21 RXs link exact according to the instructions. Multiple times to two different TX modules. As an experiment I took a trainer up. Failsafes were set on all channels to make the a/c fail to idle and a gentle descending left turn (try that with Fasst or Spectrum). Once the trainer was quite high, I turned off the TX. The trainer went into idle and a gentle left turn. I then turned the TX back on and as soon as the Futatba 9CAP beeped that it was on, I had control again.

Is XPS bullet proof. I very seriously doubt it. But I find it no worse than my Fasst or Spectrum systems. Actually, for flights flown without problems it has been better than Spectrum.

[BaldEagel]

	Quote: Originally Posted by skubacb
	- Kiwi, at least you understand the limitations of your testing as some others do not. It was not a test to see if XPS would hop since you did not have the parameters under which it would hop. - I believe my number of successful flights is important considering that some people have posted that they could never get the system to link and that it was an XPS problem. I have had 21 RXs link exact according to the instructions. Is XPS bullet proof. I very seriously doubt it. But I find it no worse than my Fasst or Spectrum systems. Actually, for flights flown without problems it has been better than Spectrum.

The XPS system in my plane in the air did not hop, just locked out on four occastions in two places of line of site of the transmision towers.

I think what is important is that one unsuccesful flight is enough, on the ground the system did all it was supposed to do by linking in accordance with the instructions, it was just in the air it did not work.

My FASST and Spektrum systems and others on my flying site, have worked without fault, glitch or lock out since day one, they I consider to be as bullet proof as you can get, is XPS bullet proof NO definatly not.

As a reminder to those reading this, the Graupner IFS system in Europe is the XPS system form the US.

Mike

[Pale Rider]

	Quote: Originally Posted by skubacb
	Actually, for flights flown without problems it has been better than Spectrum.

Thats an interesting comment. Can you show the data that would corroborate this ?