Independent tests prove lack of frequency hopping with XPS

[wrightme]

No, I am NOT automatically assuming it is voltage. I was merely reporting my observation after reading reports on the RCG XPS forums. My XPS systems have not experienced issues at all. I hope it remains that way for me. I do want to see results from tests such as XJet alluded to in the first post of this thread, but have yet to see any. Hopefully some good testing will be done.

I also realize that in plenty of cases, there will be NO actual cause found for crashes, whether it is due to a radio error, outside interference, battery voltage, signal blockage due to install errors, or other as yet unknown cause. If there is not found cause, that does not automatically bean the TX or RX is at fault. Without data, that is an error of analysis.

[buttface]

I got a rude awakening when mine painted a bulls eye on the roof of a house!

[wrightme]

	Quote: Originally Posted by buttface
	I got a rude awakening when mine painted a bulls eye on the roof of a house!

What was the cause?

[jonkoppisch]

	Quote: Originally Posted by buttface
	I got a rude awakening when mine painted a bulls eye on the roof of a house!

Is that why your hair looks like that????

[Kiwi]

Some really simple facts.

All receivers including 72 Mhz have low voltage cutoff. From memory its 3.5 volts, but I might be wrong there but thats close.

Some 2.4 Ghz Rx´s take a lifetime to re connect. ( note I did not say reboot).

Two channels is better than one ( Murphies law alone proves that without any independent testing.)

A hopping system where the Tx knows where to go and look if comunication is lost is equal to or as robust as two channels.

A single channel hopping system that does does not have a pre scanned and acknowledged next position is not as robust if swamped in a noisy environment.

A single channel non hopping system is the weakest of them all. Likely OK for park flyers and small helis etc but again if they are flown in very noisy environments they will likely crash.

FACT: 2.4 is not immune to interference. Thats pure BS if anyone thinks that. However the strenght of 2.4 is the abilty of the system to defeat the interference by moving to a clean environment.

Fact : 2.4 Ghz is the most uncontrolled non regulated frequency in use today. (I qualify that by saying while 2.4 is supposedly controlled by FCC regulations etc etc etc the junk being imported that does not and never will comply with FCC would horrify you all.) Anyone can put a sticker on a device saying its FCC, EU etc etc approved) Microwave ovens??? Just one example.

Now here´s my question and I need some help. Can anyone in this forum prove to me beyond any doubt that XPS skips. This is not bash against anyone or any system. Please can any of you show me XPS skipping. Please dont confuse this question with XJET testing to see if it does. Thats not my question. We have a wealth of intelligence on this web site so please, who can show us the system skipping??

If not ,does anyone have a Futaba XPS system they would lend me or what ever so I can put it over the scanner and see if we can force it to hop and what conditions it takes to make it do just that.

I know XJET has a system taken from a crashed plane. I dont want that as I really want him to post what he finds independently with what he has.

So guys if you have a setup collecting dust and sitting in the bottom of your field box, if you trust me to test it and send it back, then you have my word I will do so.

I have in my collection of 2.4 systems so far. FASST, SPEKTRUM, ASSAN so this will be a fair and level playing field for what ever we can test. I have the facitlies to do a decent job, I have very qualified technicians who dont know diddly squat about RC planes etc.

You cannot get a more level playing field than that.

Someone for sure is going to ask why we are doing this and what is the purpose. It´s simple. We have no bone to pick, we just want to fairly and honestly deliver what we find. I hope all the systems pass with flying colors. There´s no pre formed opinion here guys. Lets take a totally open minded look at what and how these setups work.

In fact the idea is not even to say what is best or what is worst. Its just to show (hopefuly) that each system performs as close as we can acertain to what the manufacturer advertises. No hidden agenda here. no opinions, just facts.

Forums open guys, I think it is actually getting vbe very sensible now and Sweetpea your contributions are much appreciated.

The only thing I ask from anyone who wants to debate at lenght here is lets restrain the opinions and state the facts. Then we all benifit from the experience.

[sweetpea]

Kiwi I have a JR version XPS with 2 Rx's I can supply if that helps you. I can always fly my smaller planes on 72 again........not that I want to go back there


By the way.....gotta agree with all the facts you stated.

[wrightme]

I have an extra Futaba TX, but only two RX's until my order comes in. I would gladly put the TX to the test in your hands if someone has an RX to loan. Well, I COULD supply a flight-tested 8 CH RX, unless you already have access to one......


Arrgh! Chile'?

[buttface]

	Quote: Originally Posted by wrightme
	What was the cause?

Fist off I would like to add that I have had 50 great flights on my XPS.The 40% J-tec recovered from lockout just before smashing through the roof of a house.I got it landed smoothly.I parked it and ran the motor up (DA 150). It was missing fire sporadicly and then resumed running good.I then taped on the ignition and the motor went nuts misfiring real bad again.I sent the ignition in to DA and they found it had a bad coil.The XPS was sent in to find out the coaxial cable in the module was defective. This could explain why I had lock out when the coil in the ignition went out.Even if the module was working properly I still don't think it would withstand the racket that the bad ignition was throwing at it.By the way DA sent me a new ignition for free even though the old one was 4 years old. Thank you DA!
Just keep in mind that XPS is NOT immune to interference.

[wrightme]

Wow! Glad it came out okay. i have read about issues with the coax in the TX module. Is that the coax you are talking about?

[jonkoppisch]

No voltage issue there. You didn't answer my question bf? Joking of course

[Kiwi]

Shipping is to Miami guys as I have an office there so dont be scared of the INTERNATIONAL thing. Thats my part of the deal and invisible to who ever can help.

[buttface]

	Quote: Originally Posted by wrightme
	Wow! Glad it came out okay. i have read about issues with the coas in the TX module. Is that the coax you are talking about?

YES!

[buttface]

	Quote: Originally Posted by Kiwi
	Shipping is to Miami guys as I have an office there so dont be scared of the INTERNATIONAL thing. Thats my part of the deal and invisible to who ever can help.

WHAAAAAAT?

[1bwana1]

I have a JR module and two 10 channel RX's I will loan out. If you only want the two RX (I think they work with any TX), I can send just the two RX. Just let me know where to send. I would love to see the tests. This 2.4 stuff is fascinating!

[wrightme]

If 1bwana is willing to send the RX's, I can send the TX for the 9C, the one that also works with the Hitec Optic 6. PM me an addy.