Hi Paolo,
The "A" daughterboard (for A:0 and A:1) only has one Rx LO (and one Tx LO)
such that both channels will always share the same LO. The "B"
daughterboard is the same. Thus you do not have independent RF control of
all four channels on the N310. Does that make sense?
Rob
On Tue, Feb 25, 2020 at 8:44 AM Paolo Palana via USRP-users <
usrp-users@lists.ettus.com> wrote:
> Hello to all the mailing list.
>
> I've a little problem in setting the rx frequency on my n310 when I need
> to acquire from all 4 channels.
>
> I use the n310 directly in my program using libuhd. The code I use in
> order to set the rx_frequency is:
>
> First of all set the subdevs:
>
> if(vm.count("subdev")){
> mUsrp->set_rx_subdev_spec(mSubDev);
> }
>
> ............
>
> for(size_t i=0; i<mFreqs.size(); i++)
> {
> cout << boost::format("Setting chan %d Freq: %f MHx") % (i)
> % (mFreqs[i]/1e6) << endl;
> uhd::tune_request_t tune_request(mFreqs[i]);
> tune_request.args = uhd::device_addr_t("mode_n=integer");
> mUsrp->set_rx_freq(tune_request, i);
> cout << boost::format("New RX Freq chan %d: %f MHz...") % i
> % (mUsrp->get_rx_freq(i)/1e6) << endl << endl;
> }
>
>
> The output I can see on my console confirm that every channel should
> have the rigth frequency.
>
> Of course this is not the case.
>
>
> Suppose I wont acquire from A:0 RX2 (if I use TX/RX is the same) and A:1
> RX2 tuning the first device at 654.0 MHZ
>
> and the second to 896.8 MHZ. What happen is that both channels are tuned
> to the last frequency (I'm sure of it because I tested it with a signal
> generator).
>
> I'm unable to understand why this happen. Any help is apreciated.
>
> Thank you
>
>
>
>
>
>
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