Independent tests prove lack of frequency hopping with XPS - Page 93

**Kiwi** · 04-30-2008, 07:43 PM

Gawd durn it fourstroker.

Its not the Airhorns that cost the bucks, its the darned computers. You know at the peak of my meddling to get a scenario that was totally repeatable I was running four computers together.
1. Scanner
2, Backup scanner with different software
3. Airhorn signal generator
4. Video editing (Mac) as I hate Windoze video.

But there is a way I can try out your theory and that is if I make lots of end range noise (say 1 to 3) with a crappy video camera, Use the airhorn to make lots of noise mid range that will squeeze SPEKTRUM into the far end of the frequency and it will select two channels side by side if you dont give it anywhere else to hang out.

I will try it but not this weekend please mate. My flying has turned to bulldust as I have been playing techy and pit B(*&^% for the kids on weekends. Plus I'm headed to the Nall and gonna have a right royal ball meeting all you guys again or for the first time.

First vid is being loaded as we speak. FASST is first cab off the rank.

**Kiwi** · 04-30-2008, 09:45 PM

OK,

Here they are.

The first three out of the box. SPEKTRUM will be tomorrow as I'm bushed tonight and need a decent nights sleep for a change. I will put the SPEKTRUM vid in here as soon as Youtube get it converted guys.

YouTube - FASST testing in a controlled noise...

YouTube - ASSAN 2.4Ghz controlled noise...

YouTube - XPS bench test in an interference...

Toumal · 05-01-2008, 11:16 AM

Kiwi, thanks for your most excellent work on those videos. Very informative, and with a shockingly clear punchline. Now I'm anxious to see how Spectrum fares under these conditions.

**Kiwi** · 05-01-2008, 01:29 PM

That video is done and you will see it this afternoon. It performs exactly as advertised if that steals the punch line.

Hang in, its a holiday here and the kids have demanded a little attention.

Prof. Dr. YoMan · 05-01-2008, 02:53 PM

Just raise the bandwidth of the noise. If the noise eats up more space Spektrum is
the next to fail whilest FASST will still be going (maybe with some additional latency).

Toumal · 05-01-2008, 03:57 PM

There's certainly going to be a point when even FASST is going to fail. For example, if someone were to use the same hopping sequence, that could be trouble.

If you want to survive even such deliberate interference, you'd need VDL Mode 4, (edit: I mean the methods employed there to counter interference, not the frequency band

) which unfortunately is beyond the scope of companies like Futaba. And even then, there's a point where either the signal is too weak or the interference is too wide-band and powerful.

It would be really interesting to see what it takes to actually kill FASST via deliberate band-wide interference.

Azhar · 05-01-2008, 04:23 PM

VDL M4 is in the VHF band and will not interfere with any 2.4Ghz systems. Also, it is limited use by the airlines in Europe and Russia.

Toumal · 05-01-2008, 04:26 PM

Oh I know that, I was talking about the actual technology. There are some implementation details that could be useful for RC radio systems.

Azhar · 05-01-2008, 04:46 PM

Toumal,

Probably.

**Kiwi** · 05-01-2008, 07:08 PM

Here it is guys, I gave the kids a few dollars to go buy an ice-cream and found the time I needed.

Enjoy it guys, I dont intend to do much more with this as I think the story is pretty clear without beating a dead horse any more.

YouTube - SPEKTRUM controlled interference testing

Pale Rider · 05-01-2008, 07:21 PM

Thanks Kiwi!!

GBR2 · 05-01-2008, 07:52 PM

Results were what I expected to happen. Thank you very much for all the time and effort put into this testing.

04-30-2008, 07:43 PM	#1105 (permalink)
Kiwi Bad-ass Super Contributer! Join Date: Jan 2006 Location: Chile Age: 55 Posts: 4,791 Blog Entries: 4 Awards Showcase Total Awards: 2	Re: Independent tests prove lack of frequency hopping with XPS Gawd durn it fourstroker. Its not the Airhorns that cost the bucks, its the darned computers. You know at the peak of my meddling to get a scenario that was totally repeatable I was running four computers together. 1. Scanner 2, Backup scanner with different software 3. Airhorn signal generator 4. Video editing (Mac) as I hate Windoze video. But there is a way I can try out your theory and that is if I make lots of end range noise (say 1 to 3) with a crappy video camera, Use the airhorn to make lots of noise mid range that will squeeze SPEKTRUM into the far end of the frequency and it will select two channels side by side if you dont give it anywhere else to hang out. I will try it but not this weekend please mate. My flying has turned to bulldust as I have been playing techy and pit B(&^% for the kids on weekends. Plus I'm headed to the Nall and gonna have a right royal ball meeting all you guys again or for the first time. First vid is being loaded as we speak. FASST is first cab off the rank. __________________ Kiwi* www.crackroll.com

05-01-2008, 11:16 AM	#1107 (permalink)
Toumal Doo It! Doo It! Join Date: Apr 2008 Posts: 75	Re: Independent tests prove lack of frequency hopping with XPS Kiwi, thanks for your most excellent work on those videos. Very informative, and with a shockingly clear punchline. Now I'm anxious to see how Spectrum fares under these conditions.

05-01-2008, 01:29 PM	#1108 (permalink)
Kiwi Bad-ass Super Contributer! Join Date: Jan 2006 Location: Chile Age: 55 Posts: 4,791 Blog Entries: 4 Awards Showcase Total Awards: 2	Re: Independent tests prove lack of frequency hopping with XPS That video is done and you will see it this afternoon. It performs exactly as advertised if that steals the punch line. Hang in, its a holiday here and the kids have demanded a little attention. __________________ Kiwi www.crackroll.com

05-01-2008, 02:53 PM	#1109 (permalink)
Prof. Dr. YoMan Flyin' Around Join Date: Feb 2008 Posts: 14	Re: Independent tests prove lack of frequency hopping with XPS Just raise the bandwidth of the noise. If the noise eats up more space Spektrum is the next to fail whilest FASST will still be going (maybe with some additional latency).

05-01-2008, 03:57 PM	#1110 (permalink)
Toumal Doo It! Doo It! Join Date: Apr 2008 Posts: 75	Re: Independent tests prove lack of frequency hopping with XPS There's certainly going to be a point when even FASST is going to fail. For example, if someone were to use the same hopping sequence, that could be trouble. If you want to survive even such deliberate interference, you'd need VDL Mode 4, (edit: I mean the methods employed there to counter interference, not the frequency band ) which unfortunately is beyond the scope of companies like Futaba. And even then, there's a point where either the signal is too weak or the interference is too wide-band and powerful. It would be really interesting to see what it takes to actually kill FASST via deliberate band-wide interference. Last edited by Toumal; 05-01-2008 at 04:53 PM.


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05-01-2008, 04:23 PM	#1111 (permalink)
Azhar Gettin' Lower! Join Date: Aug 2006 Location: Redmond, WA Age: 41 Posts: 42	Re: Independent tests prove lack of frequency hopping with XPS VDL M4 is in the VHF band and will not interfere with any 2.4Ghz systems. Also, it is limited use by the airlines in Europe and Russia.

05-01-2008, 04:26 PM	#1112 (permalink)
Toumal Doo It! Doo It! Join Date: Apr 2008 Posts: 75	Re: Independent tests prove lack of frequency hopping with XPS Oh I know that, I was talking about the actual technology. There are some implementation details that could be useful for RC radio systems.

05-01-2008, 04:46 PM	#1113 (permalink)
Azhar Gettin' Lower! Join Date: Aug 2006 Location: Redmond, WA Age: 41 Posts: 42	Re: Independent tests prove lack of frequency hopping with XPS Toumal, Probably.

05-01-2008, 07:21 PM	#1115 (permalink)
Pale Rider Bad-ass Super Contributer! Join Date: Jan 2006 Location: NJ Posts: 1,296	Re: Independent tests prove lack of frequency hopping with XPS Thanks Kiwi!! __________________ Some people are only alive because its illegal to shoot them. _____ Joe

05-01-2008, 07:52 PM	#1116 (permalink)
GBR2 Gettin' Lower! Join Date: Feb 2008 Posts: 42	Re: Independent tests prove lack of frequency hopping with XPS Results were what I expected to happen. Thank you very much for all the time and effort put into this testing.

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