Hi Ron, Thanks again for your help.
When I click on the link you provided, I get the XML file. Please send me the actual grc file as a standalone. Thank you! Regards, George On Mon, Dec 21, 2020 at 2:47 PM Ron Economos <[email protected]> wrote: > You should probably use an add block instead of Streams to Stream. > Here's an example flow graph. > > http://www.w6rz.net/pfb-filter-10.grc > > Ron > > On 12/21/20 11:20, George Edwards wrote: > > Hello, > > > > I have three signals routed to the Gnuradio Polyphase Channelizer > > Block. The system operates at a sample rate of 90 kHz with 3 channels > > spaced 25 kHz apart. One channel is centered around DC and the other > > two at +/-25 kHz. The 3 waveforms are routed into a Gnuradio Streams > > to Stream Block, so that a simple concatenated stream flows into the > > Gnuradio Polyphase Channelizer. I also set the Channelizer Block to > > use 120 Taps and provide 3-outputs. Here are my questions on observing > > the outputs > > > > Q1. I was expecting each output (block set to 3 outputs) to be at the > > sample rate (90 kHz/3 =) 30 kz in each of the 3-plots. The plots show > > a sample rate based on the original rate of 90 kHz. Why is this? > > > > Q2. I expected each output waveform to be centered around DC, but they > > were instead centered around -25 kHz. Why? > > > > Q3. The output bandwidth for each waveform seems a little bigger than > > the input, why? > > > > I will appreciate any help that assists to point me in the right > > direction. > > > > Regards, > > George > >
