On Tue, Jul 31, 2012 at 5:16 PM, Marcus D. Leech
<address@hidden> wrote:
Hi,
A 250 kHz signal is modulated by a 900 MHz carrier wave and sent to a receiver. The receiver is configured with the following code. Does usrp.source_c do down conversion? I mean is the output of the receiver a 900 MHz signal or a 250 kHz signal? Thanks very much.
Receiver configuration code:
rx = usrp.source_c(0, dec_rate, fusb_block_size = 512, fusb_nblocks = 8)
r = usrp.tune(rx, 0, rx_subdev, freq)
Thanks,
Pengyu
The block itself doesn't do any downconversion. That's what the USRP hardware (with daughtercards) is for.
Gnu Radio "expects" to receive a complex-baseband stream, which is what is produced at the output of the hardware, and what
"appears" coming out of the block.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org