On 02/11/2015 06:15 PM, Tommy Tracy wrote:
I am using a USRP1, and I'm trying to receive FM radio. I'm using a
BasicRX daughterboard with a 0-250MHz range. The USRP itself has a LO
frequency of 64MHz. Does this limit my frequency range to 0-32MHz, or
can I get into the 100MHz range by somehow multiplying that Local
Oscillator frequency?
I get the following error:
-- Opening a USRP1 device...
-- Using FPGA clock rate of 64.000000MHz...
-- Tune Request: 102.900000 MHz
-- The RF LO does not support the requested frequency:
-- Requested LO Frequency: 102.900000 MHz
-- RF LO Result: 0.000000 MHz
-- Attempted to use the DSP to reach the requested frequency:
-- Desired DSP Frequency: -102.900000 MHz
-- DSP Result: 25.100000 MHz
-- Successfully tuned to -25.100000 MHz
--
--
Sincerely,
Tommy James Tracy II
Ph.D Candidate
Computer Engineering
University of Virginia
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You might be better off getting a TVRX2 card for it.
You're limited on the USRP1 to 64Msps, and since the BASIC_RX does no
downconversion--it's just an ADC "buffer", you'd be limited to <= 32MHz
in the
first Nyquist zone.
You *could* put a very stiff FM-band-only filter and some gain in front
of the BASIC_RX, and calculate the appropriate "Nyquist folding" for
your desired
frequencies, and tune to those frequencies in the DC-32Mhz region.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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