Re: Is there anything about USRP blocks that breaks them within hier blocks?

[Marcus D. Leech]

On 12/04/2019 04:08 PM, Lukas Haase wrote:
> Hi Marcus,
>
>
>
> No, unofrtunately.
>
> 0 gain is still something like -10dBm. Huge and clearly visible on a spectrum 
> analyzer.
> Where the exact tone is doesn't matter because my span is 10Mhz (I actually 
> meant 915MHz) and I used full span to look at the entire frequency range.
>
> The point is: I filled all numbers in numerically and everything works if the 
> URSP Source is in my main block. Then I *copy and paste* everything (to avoid 
> any doubts) into a hier-block, put in the hier block and it stops working. I 
> showed the exact screenshots.
> Even the leakage from the USRP itself is gone which means that the USRP just 
> turns off, crashed badly or similar.
>
> This is either a weird bug or we are not supposed to use the USRP block within 
> a hier block.
>
> Thanks,
> Luke
The USRP source wouldn't really have any "idea" that it's inside a hier 
block.  This may be a weird Gnu Radio limitation--hier blocks normally
  have at least an input, and usually an input and an output.  But a GR 
expert might want to chime in about whether this case "works".