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RE: Problem when using USRP sink and USRP source in the same flowgraph
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From: |
address@hidden |
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Subject: |
RE: Problem when using USRP sink and USRP source in the same flowgraph |
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Date: |
Wed, 18 Dec 2019 07:02:56 +0000 |
I'd like to correct my description of the following error
> It also outputs lots of “L” in command window thus I can only terminate
> it by terminating the gnuradio-companion.
Not "L" but "U" is outputted in command window.
Does it means there is a underflow in USRP sink?
Best Regards
Yun
> -----Original Message-----
> From: Discuss-gnuradio
> [mailto:discuss-gnuradio-bounces+wen.yun=address@hidden] On Behalf
> Of address@hidden
> Sent: Thursday, December 12, 2019 5:54 PM
> To: address@hidden
> Subject: Problem when using USRP sink and USRP source in the same flowgraph
>
> Hello everyone
>
> I want to use the received signals from USRP source to control the
> transmission signals into USRP sink but it doesn't works well.
> (As shown in the attached flowgraph)
>
> The USRP sink doesn’t transmit at all while flowgraph is running without
> any error and alarm, or just transmits in an intermittent manner (as observed
> in an external spectrum analyzer).
> It also outputs lots of “L” in command window thus I can only terminate
> it by terminating the gnuradio-companion.
>
> But when I replace the USRP source with a random source, USRP sink works
> and I can see the continuous transmit signals in spectrum analyzer.
>
> In order to emit the effect from unstable control output from received signal,
> I also test to process it through a Or block with a constant source 1. I
> expect that the USRP sink can transmit in a continuous manner in this case,
> but it still doesn’t not work.
>
> I also tried to set USRP source and sink with different clocks (one with
> PPS and one with PC-clock), or different frequencies, but all failed.
>
> The USRP source and USRP sink use TX/RX and RX2 in the same daughter board
> of X310, respectively.
> (There is an attenuator in the loopback part between TX/RX and RX2)
>
> My OS is Ubuntu 18.04, with gnuradio 3.8, gcc 7.4.0, Python 3.6 and uhd
> 3.15.0.
>
> Is there anyone can help me? Thanks in advance
>
> Yun
>
>
>