Re: [USRP-users] Transmit underruns

Tue, 05 Jan 2021 17:34:14 -0800

Here's an ssb flow graph that's known to work. You can select the sideband with the default option of the QT GUI Chooser block before you start the flow graph (you can't change filter taps on the fly). 

The test file is here.

http://www.w6rz.net/ssbaudio.wav

Ron

On 1/5/21 15:29, Barry Duggan via USRP-users wrote:

Ubuntu 20.10
GRC 3.9.0.RC0
UHD 4.0
B200mini
USRP_ssb_xmt.grc - https://pastebin.com/ypyERUGE
I have experimented with various combinations of send_buff_size and send_frame_size but continue to get underruns while transmitting. I've also tried setting the Audio Source 'OK to Block' to 'Yes' and to 'No'. What is the right combination of parameters to minimize or eliminate the underruns? 

Thanks for your help!

73,
---
Barry Duggan KV4FV
https://github.com/duggabe

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Attachment: ssbtested.grc
Description: application/gnuradio-grc

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