Thanks for the reply, but i still have some questions. 2011/6/21 John Andrews <gnu.f...@gmail.com>
> > A USRP is a baseband IF receiver. Tune it to the GPS L1 frequency with the > right decimation rate so that you have your band of interest selected. This > should give you the IF signal. > > The source block that i used is the "UHD:usrp_source block" for USRP N210 in gniradio companion, after setting the frequency to L1 frequency 1575.42MHz, there is no "decimation" term can be set in the block(only usrp1_source and usrp2_source block have that term, not uhd), so should i use the "Rational resampler" block to instead of it? or other method to complete the decimation. The flow graph will only be "UHD:usrp_source block"→"Rational resampler"→"File sink" is that right? And I'm still a little confused, why i don't need to down convert the frequency but just do the decimation, i thought decimation is to slowdown the sample rate. Is that mean the flow graph output from "UHD:usrp_source block" is already a IF signal? If this is true, what is that signal frequency? It can't still have the 1575.42MHz if it's a IF signal, isn't it? Thanks, Eddie
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