2.4Ghz radio control

[kane]

The DX3s output is 10mW and legal to use in the UK, however you should check with the event organiser before turning up at the event.

[knightrous]

ED Said: You start with 80 channels in the 2.4Ghz spectrum - excellent I hear you say. A Tx uses two of these and isolates the two around it meaning that each Tx uses 6 channels. With 80 channels available that means you can only have 12 units at the same event live at any time

AFAIK, they do not infact take up 6 channels. The DX6 uses 2 channels (One 2.4Ghz channel per Three radio channels), because the radio is a digital radio, all the radio channels are sent via data packets, not frequency channels.

Ive tested my DX6 radio at work where we have 4 wireless networks and at least 15 clients on each and my bluetooth phone and laptop running bluetooth and I didnt have any glitches.

Its all OK down here in Oz

[james...venom]

in theory you could have many txs on the same channel?

[kane]

The Tx will only transmit on free channels.

[grant_ploughbot]

what does it matter? Spektrum garentee that 79 transmitters will run perfectly no matter what is being used around them. It doesnt matter why, or how, it does and so there are no problems in that department. All we need is the go ahead from Ofcom.

[kane]

Thats news to me Grant...

[storm]

Impossible as each TX uses 2 channels and as their DPSS marketing blurb says they lock onto the channel and dont release it so thats 40 transmitters they can be sure works assuming nothing else is on the 2.4 spectrum in the area.

Until Ofcom says we can run anywhere any time event organisers will have to request permission from Ofcom for a special licence just like we did for the US teams that had planned to come to the World Champs and wanted to run wierd US frequencies

XFM has already applied for licences to run at our events, and I would assume Roaming Robots would do the same ?

Ed
http://www.extremefightingmachines.comhttp://www.extremefightingmachines.com

[leorcc]

DSSS is not marketing blurp, actually its not even new technology as sometimes claimed. However, it is something that is different from the protocol that bluetooth and wi-fi uses for example (Which is FHSS).

What it boils down to is that indeed since the DX6 transmits over 2 channels it would be logical no more then 40 transmitters will work on both channels. However, i can imagine that the DX6 will also still work with one channel, while the other keeps scanning for a free channel to lock (i know, there is a grammatic flaw in this, but i hope you get the idea). In which case there could be more than 40 TXs working at the same time.

[leorcc]

Nice article concerning DSSS and FHSS:

http://www.arcelect.com/DSSS_FHSS-Spead_spectrum.htmhttp://www.arcelect.com/DSSS_FHSS-Spead_spectrum.htm

[grant_ploughbot]

Kane - I have stated that before, and if you want confirmation then i suggest you contact Spektrum and find out for yourself!
Ed - I do not see how it is impossible? Unless you fully understand how these work and know what happens if 2 or more channels are not free then its all just a speculation! Spektrum garentee that these WILL work whatever with 79 transmitters, and other systems will not affect or be affected by this. I think manufacturers investing millions would have looked into it and understood it a little more than we do!