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 Posted: Nov 11, 2009 - 11:38 AM |
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Joined: Mar 12, 2008
Posts: 336
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Hi,
Could you please explain me if there is possible to implement (by hand) the 802.11 norm in a nordic 2.4GHz transceiver (nrf2401).
Is it possible to communicate directly from a nordic 2.4 GHz and and a wifi access point?
Both use the 2.4 GHZ band right? What is the diffeences between transceivers?
Thanks a lot
Alex |
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Posted: Nov 11, 2009 - 12:47 PM |
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Joined: Jun 11, 2004
Posts: 2422
Location: Vilanova (Barcelona)
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Although I'm not an RF guy, I bet that Nordic transceiver uses a single frequency and a fixed (and narrow) bandwidth, while WiFi uses higher bandwidth and different frequencies that vary along the time in a pseudorandom order, with a much complex RF modulation (google for Direct Sequence Spread Spectrum to have a clue, although WiFi uses different schemes).
In short: RF modulation done by the transceivers differs. |
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Guillem.
"Common sense is the least common of the senses" Anonymous.
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Posted: Nov 11, 2009 - 04:47 PM |
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Joined: Nov 22, 2002
Posts: 12052
Location: Tangent, OR, USA
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There are many 2.4GHz "users". 802.11 (WiFi), 802.15.5 (Zigbee, XBee, etc). They use non-compatible modulation schemes including spread spectrum just so they do not interfere with each other.
The nRF2401 does NOT appear to fit any of the "standard" protocols. Therefore, do NOT expect it to be able to connect to anything else besides other nRF2401s. The description says:
Quote:
Air compatible with Nordic nRF2401A, 02, E1 and E2
If it is compatible with WiFi, it would certainly say so because that would be very valuable.
Jim |
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Jim Wagner
Oregon Research Electronics, Consulting Div.
Tangent, OR, USA
"The only thing standing between us and victory is defeat" P.G.Wodhouse in Wooster & Jeeves series
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Posted: Nov 11, 2009 - 05:28 PM |
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Joined: Jul 27, 2001
Posts: 7429
Location: St. Leonards-on-Sea (UK)
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Those Nordic RF chips use their own low-level protocol.
BTW, the nRF2401 is obsolete. Use the nRF24L01+ instead. |
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Leon Heller
G1HSM
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Posted: Nov 11, 2009 - 08:34 PM |
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Joined: Dec 18, 2001
Posts: 4717
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Nordic, cheap. Good.
Nordic, proprietary protocols. Bad.
Nordic's second source, none. Bad. |
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Posted: Nov 11, 2009 - 08:57 PM |
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Joined: Jul 27, 2001
Posts: 7429
Location: St. Leonards-on-Sea (UK)
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| There are several non-proprietary protocol stacks for the Nordic chips; I don't think that Nordic has one of their own. What wireless chips are second-sourced? |
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Leon Heller
G1HSM
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Posted: Nov 11, 2009 - 09:56 PM |
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Joined: Mar 12, 2008
Posts: 336
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Thank you very much for your explanation.
Alex |
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Posted: Nov 12, 2009 - 02:53 AM |
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Joined: Dec 18, 2001
Posts: 4717
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leon_heller wrote:
What wireless chips are second-sourced?
all the 802.15.4 chips and modules are, on the air, the same, for a given band such as 2.4GHz, at the MAC and PHY. There about 6 chip vendors and about 15 or 20 module vendors using those chips. Atmel is a chip vendor.
as are 802.11 chips/modules.
as are 802.16 chips/radio end-items. |
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Posted: Nov 12, 2009 - 06:46 AM |
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Joined: Jul 27, 2001
Posts: 7429
Location: St. Leonards-on-Sea (UK)
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| That's not really second-sourcing, if the chips aren't interchangeable. |
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Leon Heller
G1HSM
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Posted: Nov 13, 2009 - 03:20 AM |
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Joined: Dec 18, 2001
Posts: 4717
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leon_heller wrote:
That's not really second-sourcing, if the chips aren't interchangeable.
It is, to me, if you have a big project dependent on 802.15.4 and you must change vendors. The air interface stays the same. |
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