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Re: [Discuss-gnuradio] Transmit filtering

From: John Ackermann N8UR
Subject: Re: [Discuss-gnuradio] Transmit filtering
Date: Mon, 05 Sep 2011 13:47:00 -0400
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20110805 Thunderbird/3.1.12

On 09/05/2011 01:10 PM, Marcus D. Leech wrote:
On 05/09/11 12:55 PM, John Ackermann N8UR wrote:
Hi Marcus --

I am selecting complex taps from the drop down, but still get an error at 
runtime if either cutoff frequency is 0 or smaller.



I just tried it, and it works just fine.

I select:  Complex->Complex (complex taps) from the menu, with a complex
I/O, and I'm able to specify
   negative frequency components.

What is the error you're getting at runtime?

Using a band reject filter with low frequency set to -10000 and high frequency set to 10000, dropdown of complex(decimating), I get this:

Traceback (most recent call last):
  File "/home/jra/gnuradio/fm_rx.py", line 166, in <module>
    tb = fm_rx()
  File "/home/jra/gnuradio/fm_rx.py", line 115, in __init__
    1, 200000, -10000, 10000, 1000, firdes.WIN_HAMMING, 6.76))
File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/gnuradio_core_general.py", line 3437, in band_reject
    return _gnuradio_core_general.firdes_band_reject(*args, **kwargs)
IndexError: gr_firdes check failed: 0 < fa <= sampling_freq / 2

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