Hi Mike, Thanks for your help!
As I mentioned in my email, my flowgraph consists of some of the blocks in the example. I dropped some of the blocks because I am doing concept testing to ensure I know how to set parameters for the blocks. In terms of delays, that is not a problem. I am dumping the outputs into 2- file sinks, so in post processing I can compensate for that. The problem is that the tx and rx data are not the same, so I am missing in setting parameters. Thanks again! George On Fri, Mar 12, 2021 at 3:31 PM Mike Markowski <mike.ab...@gmail.com> wrote: > I can't make out details in your image, George, but attach one I made > when working through the tutorial and works just now under gnuradio > 3.8.1.0. Like someone else mentioned in another reply, I found the > delay to be 58 and set it as the default in the attached flowgraph. > Zoom in on the bit stream plot and allow a second or two after changing > delay to see the effect. > > Hope this helps, > Mike Markowski > > On 3/12/21 10:37 AM, George Edwards wrote: > > Hello, > > > > I cannot get the combined Constellation Modulator/Decoder as shown below > > to work. The figure below is an example from the online Guided Tutorial > > PSK Demodulation.... I leave out the Equalizer, Costas Loop blocks, the > > channel was set to pass the signal unimpaired and the Poly Clock Sync > > was set for Output sps=1. The constellation plot of the output of the > > Poly Clock Sync is perfect. Now, in the flowgraph below, the signal > > entering the Constellation Modulator and that leaving the Constellation > > Decoder are routed into Time Sinks for display. I route these signals > > into File Sinks so I can print them and compare 1's and 0's. The results > > show they are not the same. I passed Constellation Rect.Object > > parameters to both the Constellation Modulator and Decoder, which seems > > logical to me, but I could be wrong??? > > Will appreciate any help you can provide because what enters the > > modulator should be the same as what is leaving the demodulator. > > Regards, > > George > > > > image.png >
