Kiwi's XPS test results are up.

[Julez]

	Quote:
	I cannot understand why you did not do that in the first place as it is obvious that two antenna is the absolute minimum to keep at least one in view of the Tx at all times. Is there a physical or technical reason why you cannot do that or is it simply because you do not feel it is needed?

It is a technical reason. Have a look at the XBee modules in use.
They only have one antenna.
http://images.google.de/images?q=xbe...N&hl=de&tab=wi

Jim has claimed that his "spherical antenna" makes diversity obsolete.
Recently, there were claims about this techology being "patented".
But until a patent number is provided, I do not believe a word.

[JimDrew]

"Jim" claims what the manufacturer of the RF module claims.

The new hardware that I have designed does have two antennas because we don't want to pay royalties for Digi's antenna patent. Our new receiver sensitivity and selectivity is actually much improved over the XBEE solution, thanks to 18 months worth of develoment with a new chipset, along with PCB layout experimentation and testing .

[AWorrest]

	Quote: Originally Posted by Julez
	. . . Spektrum, for example, does not only have little headroom concerning low voltage reboots, but it also synchronizes the servo outputs. This means, that all servos begin to move at exactly the same time. . .

Not exactly corrrect. Spektrum synchronizes the outputs of the servos within a group. For example if using flaperons and dual-matched elevator servos, the left and right aileron servos will be updated simultaneously but there will be a slight delay before the left and right elevator servos are simultaneously updated.

Allan

[Julez]

	Quote:
	"Jim" claims what the manufacturer of the RF module claims.

How come that noone has ever seen any claims of a special antenne patent by the manufacturer of the Xbee modules?
How come, that the representatives say that the modules only use standard groundplane monopole antennas when asked?
How come, that in the FCC certificate, which has to list all antenna types the Xbee modules are approved for, nothing but standard antennas are mentioned?

Result:
Until a patent number is provided, I do not believe a word.

[dick hanson]

I think Jules may be part CZECH---
" If I can not find it in print-
It does not exist".
My good friend Ed Skorepa lives by this code

[Woketman]

Great post Julez.

[JimDrew]

LOL!

Digi is a billion dollar company, you can ask them yourself about their antenna patents, both pending and granted.

[Julez]

I did, and the support agent denied multiple times that any patents concerning the antenna of the Xbee(pro) module existed. Instead, they told me that it was a standard groundplane monopole.

Here is the list of antennas the Xbee(pro) module is approved for:

https://gullfoss2.fcc.gov/prod/oet/f...ive_or_pdf=pdf

Where is the spherical antenna?

Now you might claim that the modules you use are no "standard" modules. However, as you use the FCC ID of the standard modules, this claim would be BS.

Until a patent number is provided, I do not believe a word.

[airborneSGT]

Im selling my XPS 9 or 10 channel RX cheap. Just PM me.

[Woketman]

No thanks airborneSGT. I'll stick with a reliable system!!!!

[dirtybird]

There is a little dog that that lives next door that barks everytime I go outside.
You people remind me of that little dog. Every time JD posts you have to bark at him.

[Woketman]

Perhaps that dog barks for a VERY good reason. Maybe he smells bull-feces like we do every time JD posts!!!