sidebands revisited (was: ben-wpan around the world)

Richard Sharpe realrichardsharpe at gmail.com
Tue Mar 8 10:52:10 EST 2011


On Mon, Mar 7, 2011 at 3:29 AM, Werner Almesberger <werner at openmoko.org> wrote:
> I wrote:
>> Some of the spectra look a bit like porcupines, with spikes of up
>> to -30 dB in 0.25 MHz intervals. They may be indicative of the
>> build quality of the respective board, and may also indicate poor
>> antenna matching.
>
> I investigated this a little further:
>
> http://projects.qi-hardware.com/index.php/p/ben-wpan/source/tree/master/usrp/sps/20110306/README
>
> http://downloads.qi-hardware.com/people/werner/wpan/20110306/
>
> Unfortunately, I reworked atusb-20110214-4 to death (*), so I couldn't
> perform all the tests I had in mind, but it appears that the spikes in
> atusb are caused mainly by soldering problems. Temperature also has a
> small effect.
>
> (*) Well, almost. Signal strength dropped by 10 dB for some reason.
>    It'll still be suitable for software development.

If this: http://micro.arocholl.com/index.php?option=com_content&view=article&id=48:introducing-rf-explorer&catid=40:article&Itemid=61

was available in appropriate frequencies, would it be useful?

-- 
Regards,
Richard Sharpe




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