Re: [Discuss-gnuradio] freq_xlating_fir_filter question

[Eric Blossom]

On Thu, Jun 07, 2007 at 05:09:05PM -0700, Hans Glitsch wrote:
> Hello,
> 
> I have a complex signal at around 0Hz that I want to translate up to 25kHz. 
> I tried to use the freq_xlating_fir_filter like so:
> 
> gr.freq_xlating_fir_filter_ccf( 1, [1], 25e3, data_rate)
> 
> I want no decimation and no filtering in this operation.
> 
> when I set the decimation to 1, I get an assert from gr_buffer.h:96 that 
> says "s < d_bufsize"
> 
> Is freq_xlating_fir_filter_ccf not the correct block to use for this?
> 
> Thank you,
> Hans

Just use a gr.sig_source_c as an LO and feed it to a complex
multiplier along with your baseband.

See the pipeline class in gnuradio-examples/python/usrp/fm_tx4.py

Eric