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Re: [Discuss-gnuradio] can I set bandwidth for rfx1800 board

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] can I set bandwidth for rfx1800 board
Date: Mon, 27 Dec 2010 22:07:13 -0500
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On 12/27/2010 09:55 PM, James Jordan wrote:
Hi all, I check gnuradio code found set_bw( ) is not implemented in db_flexrf_900_rx_mimo_b.
So can I set bandwidth for rfx1800 board?
_______________________________________________ Discuss-gnuradio mailing list address@hidden http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Only cards that have a variable low-pass hardware filter on their baseband outputs can process set_bw().  I believe that only the
  DBS_RX and DBS_RX2 have this functionality--the MAX2118 (DBS_RX) and MAX2112 (DBS_RX2) both have programmable switched-capacitor
  filters integrated into the quadrature downconverter chip.

The RFX series cards have a fixed hardware filter giving a roughly 20MHz low-pass characteristic on the mixer output.  When this is sampled
  at either 64MHz (USRP1) or 100MHz (USRP2), and then digitally filtered with the CIC decimator, the out-of-band content should be very
  far down.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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