Hi Rob, Thank you so much for your explanation. It explains the root cause of the issue that I have been experiencing. You are correct that the WBX card I compared with is actually WBX-120, not WBX-40 as I first thought. The WBX-120 don’t have any model name marking on the cards, but when I ran uhd usrp probe on another X310 which still has WBX cards installed, the probe reported the radio cards WBX-120.
The formula that you provided explains perfectly the WCDMA constellation begins to degrade when the lo_offset > 16MHz. The 3G WCDMA signal has 5MHz bandwidth. UBX-40 has 40MHz bandwidth. Max lo_offset <= (40 – 5) /2 or 17.5MHz. Tom
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