Hi, The change log indicates a new timed complex gain feature. But, after looking through the manual, I can't find the relevant API function calls. Any advice? Rob

On Wed, Apr 22, 2026 at 4:59 PM Rob Kossler via USRP-users < usrp-users@lists.ettus.com> wrote: > Hi, > The change log indicates a new timed complex gain feature. But, after > looking through the manual, I can't find the relevant API function calls. > Any advice? > Seems like maybe it's in a weird place: https://github.com/EttusResearch/uhd/blob/9c1a361ad896f7ce0d9fd2f861ae88a67f2ea929/host/include/uhd/features/complex_gain_iface.hpp#L64 Does that help you out? Brian

Yes. Thanks! On Wed, Apr 22, 2026 at 5:22 PM Brian Padalino <bpadalino@gmail.com> wrote: > On Wed, Apr 22, 2026 at 4:59 PM Rob Kossler via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> Hi, >> The change log indicates a new timed complex gain feature. But, after >> looking through the manual, I can't find the relevant API function calls. >> Any advice? >> > > Seems like maybe it's in a weird place: > > > https://github.com/EttusResearch/uhd/blob/9c1a361ad896f7ce0d9fd2f861ae88a67f2ea929/host/include/uhd/features/complex_gain_iface.hpp#L64 > > Does that help you out? > > Brian >

So, it turns out that there is a new example program txrx_complex_gain.cpp <https://github.com/EttusResearch/uhd/blob/master/host/examples/txrx_complex_gain.cpp>. This is very helpful for understanding how to implement the complex gain feature. However, after reviewing it I'm wondering if there is a bug in the example. The example includes a call to "usrp->get_radio_control()" which returns the radio control sptr for a given "channel". However, the implementation of the function (in multi_usrp_rfnoc) returns the radio control for the RX channel (not the Tx channel). Perhaps the assumption is that the radio control is the same for Rx channel N and Tx channel N. But, I'm wondering if that is a bad assumption. If the user reorders channels via subdev spec, isn't it possible for Rx Channel N to correspond to a different radio control than Tx channel N? If so, then it seems to me that the complex gain control example will apply the specified Tx complex gain to the wrong radio. Rob On Wed, Apr 22, 2026 at 5:31 PM Rob Kossler <rkossler@nd.edu> wrote: > Yes. Thanks! > > On Wed, Apr 22, 2026 at 5:22 PM Brian Padalino <bpadalino@gmail.com> > wrote: > >> On Wed, Apr 22, 2026 at 4:59 PM Rob Kossler via USRP-users < >> usrp-users@lists.ettus.com> wrote: >> >>> Hi, >>> The change log indicates a new timed complex gain feature. But, after >>> looking through the manual, I can't find the relevant API function calls. >>> Any advice? >>> >> >> Seems like maybe it's in a weird place: >> >> >> https://github.com/EttusResearch/uhd/blob/9c1a361ad896f7ce0d9fd2f861ae88a67f2ea929/host/include/uhd/features/complex_gain_iface.hpp#L64 >> >> Does that help you out? >> >> Brian >> >