[arm-allstar] notch filter

[Ken]

Another question:  how is the bandwidth of the notch filter defined?  (in
rpt.conf)

In other words if I set "rxnotch=3500, 400" is that taken to mean 3100-3900
or 3300-3700?

Is there an upper limit of 4000 Hz for these parameters due to the 8k data
rate used internally in Asterisk? 
Or is this filtering applied right at the input stream which I think is at
48k?

Thanks
Ken
KE2N