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?
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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
http://www.sbrac.org
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