[Discuss-gnuradio] Tx Burst for Chirp signals

[Yeo Jin Kuang Alvin (IA)]

Hi everyone,

 

There are two questions that I would like to ask.

 

1)      I would like to transmit burst signals of the chirp generated from the flowgraph attached. I tried using the “stream to Tagged stream” way, but when I ran the GNU Radio Companion, it’s being transmitted continuously. Nothing seems to be happening. Am I doing something wrong and is there a better way for burst transmission?

 

2)      I noticed something with the sampling rates of the blocks. When I use the same sampling rate for all the blocks, I get underflow “UUU”. However, when I changed all the block’s sampling rate to 32MHz and leave the USRP Sink and Source to 2MHz, no underflow is seen but there is still overflow (seen in the attached screenshot).

 

What is the difference between the USRP’s sampling rate compared to the other block’s sampling rate?

 

Thank you in advanced!

Screenshot from 2018-05-10 16-18-25.png
Description: Screenshot from 2018-05-10 16-18-25.png