Does usrp.source_c do down conversion?

GNU Radio
1

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

2

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 L.
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

3

Got it. Thanks very much Marcus.