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.ab3ap@gmail.com
<mailto:mike.ab3ap@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