Re: [Discuss-gnuradio] Frequency hopping code printing UUUUU

[Laura Huddleston]

I have attached them now. sorry about that. 

the sample rate is 40MHz because I am trying to send a chirp over 20MHz, so I 
figured with nyquist's theorem (sampling rate 2x highest frequency), that would 
be the correct one. However any sample rate above ~10MHz causes my grc window 
to freeze. 

Thanks for your response!!
Laura
________________________________________
From: Maximilian Stiefel address@hidden
Sent: Friday, April 27, 2018 6:46 PM
To: Laura Huddleston
Cc: address@hidden
Subject: Re: [Discuss-gnuradio] Frequency hopping code printing UUUUU

Hello Laura,

It is definitely not afternoon here in Sweden. There is no flowgraph attached. 
Happens to me as well, every time ;)

This output usually indicates you are doing are something, that causes samples 
to be dropped, i.e. not transmitted, because something is not fast enough.

What sample rate are we talking about?

Cheers,

Max

Lördag den 28 april 2018 skrev Laura Huddleston:
>
> Good afternoon,
>
> I am creating a flowgraph that will chirp and then hop center frequency and 
> repeat.
>
> This is on the ettus n200 with a cable connection the transmit to the receive 
> port.
>
> The code worked perfectly until I increased the range of the chirp and 
> subsequently the sample rate. Now every time I run the code, it outputs 
> UUUUUUUUUUU and freezes the GRC window even after closing the pop up window 
> printing out the center frequency.
>
> Until recently it was graphing the received data on a waterfall plot, but I 
> assumed that was the reason the computer couldn't process the higher sample 
> rate, so I replaced it with several file meta sinks to prove the data was 
> what it was supposed to be.
>
> Thanks for any help you can provide,
> attached is the flowgraph
>
> Laura
>

chirp_hopper.grc
Description: chirp_hopper.grc

chirp_hopper.py
Description: chirp_hopper.py