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
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