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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