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Re: [Discuss-gnuradio] does usrp.source_c do down conversion?


From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] does usrp.source_c do down conversion?
Date: Tue, 31 Jul 2012 17:16:50 -0400
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.24) Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16

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





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