XPS bench test in an interference controlled environment

[Blaze1024]

This test seems questionable. I can't really read the display well but compared to your tests of the JR and Futaba systems the interfering signal is much stronger in this test. It purposely looks like you are swamping the receiver's front end. With the JR and Futaba tests it looked like the interfering signal was at least 20dbm down from the test signal where as in this test its actually stronger then the signal from the RC transmitter.

BTW What network analyzer are you using?

[blackmuzzle]

@Blaze1024 Hello JD. Here's what the old version of XPS does: The receiver "tells" the sender when to hop.

Now think about it: If the sender cannot reach the receiver anymore for any reason, how should the receiver be able to tell him to hop? In other words, if a radio signal doesn't get through one way, why should the return path work?

That's the simple explanation why XPS below v3 has practically no frequency agility, and is endangering anyone who uses it.

[youtubauser]

Flightlesskiwi, what can you tell us about the interefering signal that you are transmitting? Is it a modulated carrier or just a CW signal with lots of phase noise/jitter?

[808FlyBy]

a great test. should be std with all radios these days.

[kneissl1]

how about the new 3.x XPS radios? they can run in a full time hopping mode.

[blackmuzzle]

Well, Mr. Bruckmann, Graupners favorite sponsored pilot, switched from XPS/IFS to Jeti 2.4... and that *after* testing XPS 3.0

That doesn't sound encouraging to me.

[erdezko]

im sorry but you signed the death sentece for that aircraft when you was thinking to put that 90's radio

[erdezko]

thats a very old radio for that kind of plane...and something happen when you put the 2.4 module on futaba its happened to me in a 12c futaba

[johnkim100530]

I should have seen this bench test before I bought XPS. Is it unsafe to fly? What is the chance of encountering the kind of interference in actual environment?

[blackmuzzle]

XPS works, until you hit interference on your channel. Considering that the 2.4 band is open to everyone, the risk is there.

The manufacturer is in denial and comes up with new excuses every month.

I'd say that if you fly foamis at least there's little risk of injury, but then again, why risk a perfectly good foam plane?

NO radio system is 100% safe. However, not only are the competing systems better in that regard, and XPS' promises are proven to be unfulfilled. In the end it's your decision.

[FlightlessKiwi2]

Ready to upload it in the next hour or so.

[leorcc]

Terrific, thank you very much for your effort. I really appreciate it.

[leorcc]

Great testing. Do you have the Spektrum tested as well?

[blackmuzzle]

Yes he did. And guess what? Both Spektrum and FASST don't miss a beat.