Independent tests prove lack of frequency hopping with XPS

[jonkoppisch]

There has been a lot of voltage issues!! EXACTLY!!! If you've been watching, there's been a few people with other issues as well, ie, the works till it doesn't... Lately I've seen a few more popping up..

[sweetpea]

I guess your right in the competiton sense.......it kinda is. But not quite the way you mentioned it. More like.....for this specific plane/battery/price etc combo what is the correct choice.

I was thinking along these lines. Realize I don't have all the technical crap infront of me right now so some of my numbers are off but I hope you get the idea. I plan to create a table that would display info accross evenly.

Spektrum (current version)

$*** module (fits most module radios)
$** Rx
$*** combo
* year warranty
(2) * in antenna on main RX
ability to hook up 2 satellite RX's with 2 antennas each
ability to hook up multiple main RX's each with their own satellites
locates 2 freqs and stay on them at start up, does not switch
Rx shut down at 3.7v (reboot time of 1 sec) and what servos/motor do at shutdown
capacitor fix for voltage
New Power box type RX for high power consumption planes
End pins (JR plugs need to be plugged in opposite of JR RX's)
Data logger to determine fades and holds. Must be done before power off and cannot be done realtime.
Dedicated radio (DX6/7)
Jr has dedicated spektrum radio (X9303)

Future (no timeline)---

JR dedicated 12X




XPS V*
$*** module (fits most module radios)
$** Rx
$**** combo
Lifetime replacement warranty for any reason
(1) * in antenna on RX
scans to one free signal at start up
No ability to use dual RX format like 72mhz
Freq hop on gradual increase of noise floor (sudden increase no hop)
Rx shut down at 3.1v (reboot time of 1 sec) and what servos/motor do at shutdown
Top pins (end pins for 6ch and others coming)
XDP software to program RX through PC and update software
2 way communication

Future (no timeline)---
Freq hop on all noise level increases
Real Time telemetry
Satellites
universal module that plugs into trainer cord for non module radios
Complete integrated radio version




This was just a quick example.....all the actual fact info in one quick spot. You can then compare radios FACTS without the manufacturer advertising spins or users saying JR is the best because I said so crap.

You should then be able to say......

I'll have a 40% comp arf with some CF in the gear/motorbox with Smartfly equip running a123 batts...I fly IMAC and 3-D with these servos at this voltage.
my budget is approx this. Will the system fit my needs?


Agree/disagree with the format?

[wrightme]

	Quote: Originally Posted by jonkoppisch
	There has been a lot of voltage issues!! EXACTLY!!! If you've been watching, there's been a few people with other issues as well, ie, the works till it doesn't... Lately I've seen a few more popping up..

But you seem to be blaming XPS for a wire coming undone, or a connector breaking, or a servo jamming, or a battery shorting......

If a receiver does not get proper voltage, whatever level it is supposed to be, it will not work. Sure there are other issues. It is RF.

[jonkoppisch]

I didn't have any of those.... I've already went thru it and posted the results by video...

See, this is exactly what we are talking about...

Added: If it had been on 72 everyone beyond a shadow of a doubt would have said interference. Everyone that was there and saw it (quite a large crowd) said exactly that...

[wrightme]

	Quote: Originally Posted by jonkoppisch
	I didn't have any of those.... I've already went thru it and posted the results by video...

I know YOU did, but you were also implying that the OTHER crashes weren't due to something beyond the scope of XPS the company.

[jonkoppisch]

There's been quite a few reported lately that have said it's from other causes.. Was I there? No. Should I automatically assume like everyone else that they don't know what there talking about and it's all battery related? I don't think so.. You're automatically assuming that it is.. It could be voltage. I hope they find out..

[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.