Re: [Discuss-gnuradio] Simple HDLC + PSK simulation

[James Wanga]

I placed a file sink after the constellation demodulator and discovered that it 
seems too many bits are being output. Should I be packing bits before I pass 
the  modulator output to the HDLC framer? Thank you.

James Wanga

> On Oct 26, 2017, at 11:04 AM, James Wanga <address@hidden> wrote:
> 
> Hi All.
> 
> Im attempting to create the simplest possible simulation of PSK modulated 
> HDLC Frames. Without modulation, the following works perfectly:
> 
>       Message Strobe -> HDLC Framer -> HDLC Deframer -> Message Debug.
> 
> However when I add a BPSK modulator and receiver between the HDLC blocks. I 
> see nothing printed from the message debug:
> 
>       Message Strobe -> HDLC Framer -> BPSK Constellation Modulator -> BPSK 
> Constellation Receiver -> HDLC Deframer -> Message Debug.
> 
> Strangely, If I place a time sink between the Constellation Receiver and the 
> HDLC defamer, I can see the symbols coming through. I’ve attached my flow 
> graph and time sink for reference. What am I missing? 
> 
> Thank you for your help.
> 
> <Screen Shot 2017-10-26 at 10.52.48 AM.png><Screen Shot 2017-10-26 at 
> 10.52.59 AM.png>
> 
>