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Re: [Discuss-gnuradio] Daughter Boards frequencies

From: Sebastiaan Heunis
Subject: Re: [Discuss-gnuradio] Daughter Boards frequencies
Date: Wed, 7 Jan 2009 20:53:43 +0200


I can help with the RX bit.  Read up on undersampling.  This is how
you would do it with a BasicRX card.  You can basically sample a
signal higher than 64MHz provided that the bandwidth is less than
64MHz/2.  The signal then ends up between 0 and 32MHz and is either
inverted or not.  You then need to set the cordic frequency to that
frequency to mix it down to DC on the FPGA.

With the TVRX cards there is a tuner that downconverts a high
frequency signal (FM,UHF,VHF) down to somewhere below 64MHz (depending
on which TVRX revision you have).


On Wed, Jan 7, 2009 at 8:17 PM, Ronaldo Nunez <address@hidden> wrote:
> Hello Community,
> I read in the faq and in the usrp_stardard.cc that RF frequencies higher
> than 44MHz can't be tuned in URSP,
> so how BasicTX, and other daughter boards can tune hundreds, thousands of
> MHz ?
> Thank you all, Regards...
> --
> __________________________________
> Ronaldo A. Viera Nunez
> Acad├¬mico/Engenharia El├ętrica
> Universidade Federal de Santa Maria
> Santa Maria - RS - Brasil
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

Sebastiaan Heunis
Radar and Remote Sensing Group, University of Cape Town
Tel:  +27 83 305 5667

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