On 5/25/06, Olin Lathrop <olin_piclist@embedinc.com> wrote:
> Vasile Surducan wrote:
> >> I don't know since it has never been broken out. The parts we are using
> >> that are only for WiFi are pretty much just the compact flash
> >> connector and
> >> the compact flash WiFi card.
> >
> > Yes, but this means the RF project belongs to someone else,
>
> Exactly!  Getting all those details right and properly certified by
> regulatory agencies is a *major* job.  The volumes of compact flash Wifi
> cards are high enough that you can get them for a very reasonable markup
> over production cost.  You really really don't want to try designing your
> own just to have WiFi connectivity in a bigger product.
>
> > you have
> > no control on that side and you depend from those RF design, BER, SNR,
> > etc, etc, etc.
>
> Right.  Someone else has already invented the wheel, designed a product
> around it, dealt with the wheel police, and is producing them in volume at a
> good price.  Since my end product just uses wheels to get a bigger job done,
> it would be really silly to try and design and produce my own.
>
> > As long you've change the RF part you must made changes in your
> > project too, including firmeare because there are many differences in
> > RF desighns even the connector is the same.
>
> I'm not quite sure what you are saying, but we are working with CF cards
> that all use the same popular chipset.


Intercept the RF with an atenna. Connect the antenna with a spectrum analyzer
(a real one not those made by PCMCIA WIFI card + a software program).
Change the CF WIMAX card and see what you'll see.
It's the same CF card, the same 802.11 standard and the way of flowing packs
are completely different, the SNR (or SFDR) is different, the EVM is
different and the efect you may see is just one: this CF works, the
other CF works too but
slowly, and closer to the router...

Vasile


>
> > And again I don't think you're able to use the entire bandwith
> > (54Mbps) that 802.11 a/g recommend.
>
> No, and I don't want to.  The overall datarate of this product is something
> a PIC can handle.  The reason for WiFi is easier and cheaper installation.
>
>
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