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2007-07-01
, 17:25
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Posts: 269 |
Thanked: 4 times |
Joined on Feb 2007
@ Finland
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#2
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I dont know what it means, although I have a hypothesis.
You also can check the power emitted by the 4 devices (3 above 1 GHz, 1 under) in the same page of the FCC. 2 devices have output power undr 100 mW, one at 0,234 W? The other one we don't know.
That s why I asked 2 days ago for the specs of the wifi module.
Can someone help?
S
Last edited by Seb Per; 2007-07-01 at 17:28.
You also can check the power emitted by the 4 devices (3 above 1 GHz, 1 under) in the same page of the FCC. 2 devices have output power undr 100 mW, one at 0,234 W? The other one we don't know.
That s why I asked 2 days ago for the specs of the wifi module.
Can someone help?
S
Last edited by Seb Per; 2007-07-01 at 17:28.
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2007-07-01
, 17:52
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Posts: 6 |
Thanked: 0 times |
Joined on Jul 2007
@ Finland
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#3
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Can you give the link to that document and tell which page? Thx
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2007-07-01
, 18:40
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Posts: 269 |
Thanked: 4 times |
Joined on Feb 2007
@ Finland
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#4
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Go to FFC webpage, go to
https://gullfoss2.fcc.gov/oetcf/eas/...ericSearch.cfm
enter
Grantee Code: LJP
Product Code: RX-34
Enter
On the page displayed, open the 3 form (view form), first left column . You will get the specs of the emitters (frequency, output power and class).
https://gullfoss2.fcc.gov/oetcf/eas/...ericSearch.cfm
enter
Grantee Code: LJP
Product Code: RX-34
Enter
On the page displayed, open the 3 form (view form), first left column . You will get the specs of the emitters (frequency, output power and class).
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2007-07-01
, 19:13
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Posts: 6 |
Thanked: 0 times |
Joined on Jul 2007
@ Finland
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#5
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Well, last two pages seems to be quite ok (for me 
) because frequencies and transmission techniques match. 802.11b uses DSSS (one form of spread spectrum techniques) if I remember correctly and it's mentioned there, also the frequncy is 2.4G which is ok. Bluetooth also uses spread spectrum techniques and if I remember correctly, it's FHSS in BT case.
And there is a mention in the first case: "Low Power Transmitters below 1 GHz (except Spread Spectrum), Unintentional Radiators". That could be something related to AC voltage and charger, don't know. But the word "unintentional".
) because frequencies and transmission techniques match. 802.11b uses DSSS (one form of spread spectrum techniques) if I remember correctly and it's mentioned there, also the frequncy is 2.4G which is ok. Bluetooth also uses spread spectrum techniques and if I remember correctly, it's FHSS in BT case.And there is a mention in the first case: "Low Power Transmitters below 1 GHz (except Spread Spectrum), Unintentional Radiators". That could be something related to AC voltage and charger, don't know. But the word "unintentional".
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2007-07-01
, 19:20
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Posts: 269 |
Thanked: 4 times |
Joined on Feb 2007
@ Finland
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#6
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Originally Posted by TheSkyIsFalling
Yes however there are 2 lines in form with 100 mW output power units. Is it Wifi and BT?
Well, last two pages seems to be quite ok (for me
And there is a mention in the first case: "Low Power Transmitters below 1 GHz (except Spread Spectrum), Unintentional Radiators". That could be something related to AC voltage and charger, don't know. But the word "unintentional".
And what is the unit with 0,234 W? in the same frequency range ( a bit more narrow) class "DTS - Digital Transmission System"
2,4 GHz is one frequency used by Wifi, Bluetooth and also Wimax (802.16 ) - source Wikipedia-
S
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2007-07-01
, 19:45
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Posts: 6 |
Thanked: 0 times |
Joined on Jul 2007
@ Finland
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#7
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Hmm, actually quite interesting. One article says that the maximum transmission power for GSM900 is about 0,25W. And one of the FCC pages says 0,234W and the frequency is 2.4G. IMO the transmission power should be much lower when we are using that free 2.4G band. Hmm, do we have Wimax here? Actually the mobile version of Wimax is working from 2 GHz to several GHzs. And the transmission power (0.234W) could be something like that and there is no need for the line of sight component.
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2007-07-01
, 20:05
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Posts: 269 |
Thanked: 4 times |
Joined on Feb 2007
@ Finland
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#8
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Originally Posted by TheSkyIsFalling
this is an hypothesis i thought since a week ago. but i m not educated in this field at all..
Hmm, actually quite interesting. One article says that the maximum transmission power for GSM900 is about 0,25W. And one of the FCC pages says 0,234W and the frequency is 2.4G. IMO the transmission power should be much lower when we are using that free 2.4G band. Hmm, do we have Wimax here? Actually the mobile version of Wimax is working from 2 GHz to several GHzs. And the transmission power (0.234W) could be something like that and there is no need for the line of sight component.
there is also a thread mentioning a hidden easter egg in this forum , which is not the fm radio. also so many people noticing the extraordinary sensitivity of the IT. i don't know.
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2007-07-04
, 22:19
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Posts: 3,841 |
Thanked: 1,079 times |
Joined on Nov 2006
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#9
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From what I remember from reading the FCC papers those months ago, there is one single antenna used for both BT and wi-fi, in a multiplexing fashion.
__________________
N800/OS2007|N900/Maemo5
-- Metalayer-crawler delenda est.
-- Current state: Fed up with everything MeeGo.
N800/OS2007|N900/Maemo5
-- Metalayer-crawler delenda est.
-- Current state: Fed up with everything MeeGo.
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2007-07-05
, 14:09
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Posts: 231 |
Thanked: 21 times |
Joined on May 2007
@ Singapore
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#10
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i believe so, which is why i think the wifi gets dropped everytime a bluetooth device connects.
| The Following User Says Thank You to torx For This Useful Post: | ||
But here's my question and I hope that there is someone who understand this kind of antenna things: Do we have here only one antenna (dipole) or are those two antenna patterns for two different wireless systems (bluetooth and wlan)?
In my opinion it sounds quite stupid to use two separate antennas for the systems which operate in the same frequency... Or do we even have here antennas for the same frequencys (2.4 GHz)? And if not, it makes this whole thing quite interesting