Max clock for Tx NCO, Shifting +-200MHz using NCO and 2 channels

I want to use LimeSDR USB to to simulate GPS signals. I need transmit two signals L1(f=1575.42MHz) and L5(f=1176.45MHz).
Is it technically possible to send those 2 signals setting RF frequency on 1375MHz and NCO ChannelA +200MHz and NCO ChannelB -200MHz?
I see NCO depends on DAC Clock. Is it possible to generate 400MHz clock for TxTSP?