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[Discuss-gnuradio] Confusion, help please

From: Ali Riaz
Subject: [Discuss-gnuradio] Confusion, help please
Date: Mon, 2 Mar 2015 17:27:36 -0600

Hello all,

I just had a quick question regarding the polyphase channelizer. As a start, I'm trying to divide an input spectrum into 6 channels of equal width. My sample rate for now is 5 MHz and the way I'm calculating the taps as follows:

firdes.low_pass2(1.0, samp_rate, samp_rate/(nchan*2.15), samp_rate/(nchan*13.8),attenuation_dB = 10, window = firdes.WIN_HAMMING)

The channels are being divided equally now, but the first channel behaves very different from the rest, it becomes super wide for a moment, and then shrinks back to normal just like the rest of the channels and this happens repeatedly. I'm honestly stumped as to what the reason could be, so would really appreciate if anybody can point me in the right direction or at least clarify why this is happening.

You can find the images here: http://tinypic.com/a/3e8so/4

Thank you,


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