[Discuss-gnuradio] GRC Polyphase Channelizer examples?

[John Ackermann N8UR]

Is there a (hopefully simple) example of using the polyphase channelizer 
block in grc?

I'm trying to do a simple case of dividing a 250 kHz wide stream from 
USRP into a small number (initially 4) of contiguous channels.  Given my 
generally ignorant status, I'm stumped on setting the parameters.

e.g. --

(a) is the "taps" param an integer or is it a firdes function as in the 
xlating FIR filter?

(b) what is the oversample param used for?

(c) what is the sample rate of each of the output channels -- it doesn't 
appear to be the same at the sample rate at the input, or alternatively 
my parameters are so far off that what's coming out of the thing is 
absolute junk (when I feed it into a USRP sink set to 250ksamples, I get 
screens of underruns).

Thanks,

John