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Re: [Discuss-gnuradio] Confusion, help please

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] Confusion, help please
Date: Tue, 03 Mar 2015 09:42:19 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0

Hi Ali,

that's interesting.
Would you mind sharing the flow graph that you use?


PS: Although using adblock plus, before I see every other picture on tinypic, I get stuff like casino advertisment, and similar.
Could you use any image hoster that doesn't block view on the pictures with advertisement? I found imgur.com to work fairly well.
On 03/03/2015 12:27 AM, Ali Riaz wrote:
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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