Re: [Discuss-gnuradio] Angle manipulation & other concerns

[Martin Dvh]

joe j wrote:
> Thanks alot Martin, for detailed explanation in the relationship of
> complex numbers with signals.  :)
> *//*
> 
>     the output is a complex signal with amplitude=amp1*amp2 and
>     phase=phase1-phase2
> 
> To everyone,
> In regards to the mux question posted,
> something.set_mux(gr.hexint(0x32103210)), the block diagram of the USRP
> board indicates that 0 and 1 are for Rx-A and Rx-B and 2&3 are for Tx-A
> and Tx-B, respectively.  So, does that mean if we set our mux to
> 0x32103210 we receive I&Q's from Tx-B, Tx-A, Rx-B, Rx-A (this order)?
I think you are mixing things up here.
The receive mux and transmit mux don't have the same meaning.
if you have
usrp_receive=usrp.source_c()
usrp_receive.set_mux(gr.hexint(0x32103210))
This means RXA I,Q will be on channel 0
           RXB I,Q will be on channel 1
           RXA I,Q will be on channel 2
           RXB I,Q will be on channel 3

So RXA and RXB are just repeated here
You don't receive TX-B or TX-A, you only receive RX-A or RX-B
As a theoretical example
0x76543210 would mean
RXA I,Q on channel 0
RXB on channel 1
RXC on channel 2
RXD on channel 3

This is theoretical since RXC and RXD don't exist.
For the exact definition and explanation look at
usrp/firmware/include/fpga_regs_standard.h
usrp/firmware/include/fpga_regs_common.h

greetings,
Martin
> 
> Thanks,
> JC
> 
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