On 2022-01-24 13:51, Tillson, Bob (US) via USRP-users wrote:
Is LO offset tuning supported by the N310?
Using UHD 3.14.1.1 and with rx samples to file, I noticed the
following output:
Setting RX Freq: 350.000000 MHz...
Setting RX LO Offset: 30.000000 MHz...
Actual RX Freq: 350.000000 MHz...
Using other values for LO Offset does not change Actual RX Freq either…
Thanks,
LO offset still delivers the desired center frequency to the host, but
what it does is rather than have LO==desired, it sets the LO to
<specified_offset+desired>, and then uses the DDC machinery to rotate
the resulting bandwidth down so that 0Hz is
right at your desired frequency.
This is used to side-step things like the DC offset that is inevitable
with direct-conversion receiver designs, as with N310.
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