[Discuss-gnuradio] PSK.py script giving errors

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 = psk_mod()

  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