Thank you for the clarification. I will update it to 3.8 soon.
However, baseband is the main signal which will be converted to RF signal by means of upconverter. I have a SDR device(red-pitaya), in which two digitally modulated baseband signals(I-Q) will come out separately and later on with RF front end it will be mixed with high frequency. That is the main idea. Hence, first, I need the basic baseband signal (low frequency) but it would be a 0Hz frequency? That I have no idea of. The timing diagram is showing the signal has some certain frequency, then it would be 0?
Would you please give me some details. Thank you so much.
ps: WX block insertion was a mistake. I didn't realize it until you mentioned it. As I am going to write a report on my work as well, it is great to know that now the graph can be export. Is there any updates also for extracting GRC flow graph from file>screen capture as well?