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Topic:
tsu/rfx 9200 -- Frequencies for the channels?
This thread has 5 replies. Displaying all posts.
Post 1 made on Tuesday January 6, 2009 at 20:04
SoundAV
Lurking Member
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September 2008
6
I know it's a 2.4GHz device, but I was wondering if anyone knew the exact frequencies for channels 1,2, and 3?

I am debugging a system that has had more "Command Failed" as of late. They got a new router and Xbox, both 2.4 GHz devices.

Right now their router is on auto scan, but I found a list of the exact channel to frequency mappings. I'm hoping if I can figure out what the RFX 9200 uses, I can deconflict. I'd like to avoid trial and error if at all possible.

The problem persists when the Xbox is off, so I am pretty sure it is the router.

Thanks!
Post 2 made on Wednesday January 7, 2009 at 07:54
Sogliphy
Long Time Member
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Posts:
July 2007
186
AFAIK, the "channel" numbers (1-2-3) of an RFX9200 are logical channels, and do not relate to the radio frequency being used.

As can be observed with a tool like Wi-Spy (http://www.metageek.net/), the RFX9200 always operates on IEEE 802.15.4-2003 WPAN channels 11, 15, 21 or 25, irregardless of the logical channel being set.

Center frequencies for these WPAN channels:

Channel 11 : 2460 MHz
Channel 15 : 2480 MHz
Channel 21 : 2510 MHz
Channel 25 : 2530 MHz
OP | Post 3 made on Wednesday January 7, 2009 at 16:50
SoundAV
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6
Thank you. That was exactly what I was looking for.
Post 4 made on Thursday January 8, 2009 at 04:10
Luukske
Long Time Member
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Posts:
June 2004
49
RFX-TSU automatically searches for the least used frequency. If the access point does the same (auto scan), then you might end up with constantly changing channels. It might therefore be handy to set the access point on one specific channel.
Post 5 made on Thursday January 8, 2009 at 04:20
Luukske
Long Time Member
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Posts:
June 2004
49
Center frequencies for these WPAN channels:

Channel 11 : 2460 MHz
Channel 15 : 2480 MHz
Channel 21 : 2510 MHz
Channel 25 : 2530 MHz

Note that above mentioned frequencies are not correct (the channel number IS correct). 802.15.4 uses following frequency formula:
Fc= 2405 + 5 * (k-11) where k = 11...26
giving following frequencies:

ch11: 2405 MHz
ch15: 2425 MHz
ch21: 2455 MHz
ch25: 2475 MHz
Post 6 made on Thursday January 8, 2009 at 13:14
dlhsu
Lurking Member
Joined:
Posts:
January 2009
1
This is very helpful information because I am also trying to eliminate the "Command Failures" by making sure nothing is in conflict with my RFX9200.

I guess I am still confused about the logical channels. If all frequencies are being used/monitored, how do I make sure my wireless router and RFX9200 never conflict? I currently have set the channel on my wireless router, but occasionally see the red light flicker (which is due to a conflict on that frequency?). Is my only option either channel 6 (2437 MHz) or channel 7 (2442 MHz) on my 2.4 GHz router since all logical channels use the above frequencies?

Lastly, what is the best logical channel for my RFX9200?

Is the "Command Failure" related to not using delays in my macros? (i.e. too many commands being sent in a row with no delay)

Thanks for any help and sorry if I am missing something!


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