Hi Eugene, Your question is pretty similar to a recent post "X440 X4_400 with DDC not working". It seems that the DDC has a maximum clock rate that is smaller than needed in order to handle a high sample rate (e.g., 500 MS/s) coming from the radio. The latter is needed to capture the full RF bandwidth that you need to include both L1 and L2. Take a look at that other post to see if anything is helpful. There may not be an easy answer.... Rob
On Wed, Feb 4, 2026 at 2:57 PM Eugene Grayver <[email protected]> wrote: > Hi, > > I may be getting greedy but ... > > I want to record GPS signal with separate streams for L1 (at 1.6 GHz) and > L2 (at 1.2 GHz) Each signal is about 50 MHz wide by itself, but getting > both would require ~400 Msps. > > I need all 8 channels of the X440. > > Ideally, I would use the 200 MHz variant with **two** DDCs per channel. > One DDC for L1 and one for L2. That way the total sample rate would be > only 100 Msps (vs. 400). > > > - Would UHD support that? > - I assume it's a custom RFNoC build > > > Any suggestions on how to set that up? Would 16 streams even work? > > Thanks > > Eugene Grayver, Ph.D. > Principal Engineer > 310-336-1274 > _______________________________________________ > USRP-users mailing list -- [email protected] > To unsubscribe send an email to [email protected] >
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