Re: [Discuss-gnuradio] right source to input message

[Josh Blum]

On 03/07/2013 07:21 PM, manjusha wrote:
> Thanks for your reply josh..
> 
> I only have the message socket block now.But still i get the attached
> error..
> 

This "Preload>=0" that you sent to the other mailing list?

No idea, i couldnt find the error in gnuradio source or grextras source.
Is there any more verbose for that error?

> And,you were suggesting an amplitude < 1 which i am not aware of..can you
> please explain.

An amplitude of 1.0 scales to the full range of the DAC. You dont want
to be sending samples that would be clipping. So be careful of the
amplitude of your signal on the output of the filter block.

> Also,i am using a trying to transmit a message so why do i need a packet
> deframer?
> 

Well, you dont need a deframer.

It seemed you were searching for something to connect to the input port
of that block. One of the known use cases is a deframer block.

-josh

> 
> thanks.. tx_message_socket.png
> <http://gnuradio.4.n7.nabble.com/file/n40062/tx_message_socket.png>  
> manjusha,
> 
> * Delete this: The pad source is for hierarhical blocks.
> * Delete this: That message source is not related
> * I recommend to reduce the amplitude of the signals sent to the usrp
> source < 1.0 magnitude
> 
> * You do not need to feed the input of the message socket block - that
> is for writing to the socket. You would probably connect a packet
> deframer from the receive chain there.
> 
> Your flow graph is ready, if you write a packet into this socket, it
> will transmit something.
> 
> 
> the pad source is for making hierarchical blocks, you probably dont want
> this.
> 
> There are 3 ways to get data into that packet encoder from gr extras.
> 
> * A message socket block
> * The stream to blob block
> * A custom block that outputs message blobs
> 
> 
> 
> 
> -----
> Manjusha
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