Hua,
Yes to both questions.
If you drive a constant DC amplitude into a USRP sink in GR then you can
observe the frequency and phase of the FPGA “digital LO” on an oscilloscope
easily.
-ian
> On Nov 16, 2018, at 9:40 PM, Huacheng Zeng via USRP-users
> <usrp-users@lists.ettus.com> wrote:
>
> Dear All:
>
> I have some questions regarding BasicTX Daughterboard. It seems that this
> board does not have complex design such as analog mixer. But it can be set
> with a carrier frequency in GNU Radio. My questions are:
>
> 1) When I use this daughterboard and set its carrier frequency to nonzero
> (e.g., 50 MHz), is the frequency up-conversion done in the digital domain by
> the motherboard's FPGA?
>
> 2) If I use this daughterboard in IQ mode (i.e., setting frontend to AB),
> what are the output signal at antenna ports Tx-A and Tx-B? Denote S(t) as the
> digital baseband signal and fc as the carrier frequency specified in GNU
> Radio, are the output signals at Tx-A and Tx-B ports Re{S(t)}*cos(2*pi*fc*t)
> and Im{S(t)}*sin(2*pi*fc*t), respectively? If not, what is the output signals
> at those two antenna ports?
>
> Thank you in advance!
>
> Hua
>
>
>
>
>
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