Re: [Discuss-gnuradio] GRC Polyphase Channelizer examples?

[Marcus D. Leech]

On 14/10/2011 12:01 PM, Tom Rondeau wrote:
> You've almost got it right except for the taps. The "taps" parameter 
> is the FIR taps of the prototype filter, which then gets partitioned 
> among the N channels of the channelizer.
>
> While there is no example in GRC readily available, you can look at 
> the channelize.py example in:  gnuradio-examples/python/pfb/
>
> Specifically, line 49 is where the filter taps are created. Notice 
> that the sample rate is the sample rate at the input to the 
> channelizer while the bandwidth and transition width are defined for 
> the channel bandwidths. This makes a fairly long filter that is then 
> split up between the N channels of the PFB.
>
> Tom
I have to wonder, though, John, whether your "scheme" for saving power 
in a linear transponder is actually going to be workable.

Yes, you'll squelch the "no signal" channels going into the transponder, 
but that is only the difference between the received Tsys over
  the filter bandwidth and the inherent noise power of the transmitter 
itself.