Re: [Discuss-gnuradio] PSK.py script giving errors

[Tom Rondeau]

On Tue, Feb 17, 2015 at 6:15 AM, vaibhav kulkarni <address@hidden> wrote:

Hi All, 

I am trying to make the following system. 

Packet Generator ------> BPSK Modulator --------> Frequency Hopper ---------------> UHD Sink

I read that the generic block psk.py can be used as a BPSK modulator so for the 1st two blocks I use the class psk_mod(generic_mod), setting the constellations as 2. Also the input to this block is a byte stream. So the 1st two blocks of my system are set. 

For frequency hopper () I want to send every new BPSK modulated packet on a different frequency seperated at 5MHz starting from 2.40Ghz) as I use the frequency_hopping.py module which uses stream_tags for frequenncy tuning. and Finally connecting it to the usrp sink. 

Final system looking like this psk_mod (hier_block2), hopper_block(hier_block2)

self.connect(psk_mod, hopper_block, self.sink)

However the PSK block gives the following errors. 

1. Traceback (most recent call last):

  File "./psk_fh.py", line 301, in <module>

    main()

  File "./psk_fh.py", line 294, in main

    top_block = FlowGraph(args)

  File "./psk_fh.py", line 258, in __init__

    src = "">

  File "./psk_fh.py", line 119, in __init__

    super(psk_mod, self).__init__(constellation, differential, *args, **kwargs)

TypeError: __init__() takes exactly 4 arguments (3 given)

Any help to resolve this or another approach to this system is appriciated. 

-

Vaibhav Kulkarni

ETH Zurich

This is probably related to a change in version for the psk_mod class. Take a look at the psk.py file you have. The current version looks like:

     def __init__(self, constellation_points=_def_constellation_points,

                 mod_code=_def_mod_code,

                 differential=_def_differential,

                 *args, **kwargs):

So you need that mod_code value set, as well. It's described in the class documentation.

Tom